{"id":293,"date":"2016-12-16T11:24:43","date_gmt":"2016-12-16T10:24:43","guid":{"rendered":"https:\/\/pepsi.aip.de\/?page_id=293"},"modified":"2023-11-29T08:29:16","modified_gmt":"2023-11-29T07:29:16","slug":"observing-with-vatt","status":"publish","type":"page","link":"https:\/\/pepsi.aip.de\/?page_id=293","title":{"rendered":"Observing with VATT"},"content":{"rendered":"\n<p>29.11.2023<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Summary<\/h1>\n\n\n\n<p>This document describes how to observe with PEPSI at Vatican Advanced Technology Telescope (VATT).<\/p>\n\n\n\n<p>Observations are performed with following steps:<br><strong>I<\/strong> Accessing PEPSI GUI<br><strong>II<\/strong> Connecting with VATT<br><strong>III<\/strong> Selecting and sending targets to VATT<br><strong>IV<\/strong> Guiding<br><strong>V<\/strong> Observing<\/p>\n\n\n\n<p>The document also describes following items:<br><strong>VI<\/strong> Viewing obtained spectra<br><strong>VII<\/strong> Estimating S\/N<br><strong>VIII<\/strong> Calibration frames<br><strong>IX<\/strong> Telemetry<br><strong>X<\/strong> Troubleshooting<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">I Accessing PEPSI GUI<\/h1>\n\n\n\n<p>There are 3 options for from where the observations can be done. <strong><span style=\"color: #ff0000;\">NOTE<\/span><\/strong> that for <span style=\"color: #ff00ff;\">Options 2 and 3<\/span> you must request VPN access \u00a0to LBTO beforehand &#8211; at least 10 days before the run. Write to <a href=\"mailto:ScienceOps@lbto.org\">ScienceOps@lbto.org<\/a>\u00a0to get it! <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"color: #ff00ff;\"><strong>Option 1:<\/strong><\/span> use the PEPSI 4K monitor in the LBT control room<\/li>\n\n\n\n<li><strong><span style=\"color: #ff00ff;\">Option 2:<\/span><\/strong> connect to it from VATT\n<ul class=\"wp-block-list\">\n<li>using \u2018<span style=\"color: #000080;\">vattarchive<\/span>\u2019 server<\/li>\n\n\n\n<li>login as \u2018<span style=\"color: #000080;\">vattobserver<\/span>\u2019, passwd is at control room<\/li>\n\n\n\n<li>type in terminal <span style=\"color: #000080;\">vncviewer -via USERNAME@ssh.lbto.org &nbsp;alpha.pepsi.lbto.org:1<\/span><\/li>\n\n\n\n<li>environment (telemetry) status can be seen at :2<\/li>\n\n\n\n<li>account passwd has been given to you by LBTO <\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><span style=\"color: #ff00ff;\">Option 3:<\/span><\/strong> observe remotely<\/li>\n\n\n\n<li>\n<ul class=\"wp-block-list\">\n<li>first make a <strong><span style=\"color: #000080;\">VPN<\/span> <\/strong>connection to <span style=\"color: #333399;\">vpn.lbto.org <\/span>(using Cisco AnyConnect)<\/li>\n\n\n\n<li>then either open a <strong><span style=\"color: #000080;\">VNC<\/span><\/strong>&nbsp;program and take connection to server <span style=\"color: #000080;\">alpha.pepsi.lbto.org:1 <span style=\"color: #000000;\">(or :2) &nbsp;or <\/span><\/span>type in terminal <span style=\"color: #000080;\">vncviewer alpha.pepsi.lbto.org:1<\/span> <\/li>\n\n\n\n<li>in the end, close the VNC connection, exit viewer and disconnect VPN<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/PEPSI_PFU_GUI.png\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"166\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/PEPSI_PFU_GUI-300x166.png\" alt=\"\" class=\"wp-image-1327\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/PEPSI_PFU_GUI-300x166.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/PEPSI_PFU_GUI-768x424.png 768w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/PEPSI_PFU_GUI-1024x566.png 1024w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/PEPSI_PFU_GUI-672x372.png 672w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/PEPSI_PFU_GUI-1038x576.png 1038w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption class=\"wp-element-caption\">VNC view of the user interface (:1)<\/figcaption><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Telemetry.png\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"167\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Telemetry-300x167.png\" alt=\"\" class=\"wp-image-1276\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Telemetry-300x167.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Telemetry-768x428.png 768w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Telemetry-1024x570.png 1024w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Telemetry-672x372.png 672w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Telemetry-1038x576.png 1038w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption class=\"wp-element-caption\">VNC view of telemetry (:2)<\/figcaption><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0);color:#f80303\" class=\"has-inline-color\"><strong>The PEPSI user interface program should be kept running all the time.<\/strong><\/mark><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If it is not running, click Activities in the left upper corner. You should get a menu having PEPSI logo. Click on that logo to open the program.<\/li>\n\n\n\n<li>Or use a terminal to open it (if not, open a new terminal):\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/PEPSI_terminal-1.png\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"244\" class=\"alignnone wp-image-1229 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/PEPSI_terminal-1-300x244.png\" alt=\"\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/PEPSI_terminal-1-300x244.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/PEPSI_terminal-1-768x625.png 768w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/PEPSI_terminal-1.png 785w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n\n\n\n<li><strong>on <span style=\"color: #ff0000;\">pepsi@alpha<\/span> type \u2018<span style=\"color: #000080;\">pepsi&#8217;<\/span><\/strong>  <\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">II Connecting with VATT<\/h1>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Now you should have \u2018<span style=\"color: #000080;\"><strong>PEPSI Spectrograph Control Interface<\/strong><\/span>\u2019 open:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_PSCI.png\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"203\" class=\"alignnone wp-image-1082 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_PSCI-300x203.png\" alt=\"\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_PSCI-300x203.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_PSCI.png 754w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a> <\/li>\n\n\n\n<li>There make sure that both &#8216;VATT&#8217; options are checked<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><span style=\"color: #000080;\">&#8216;VATT Telescope Control Interface&#8217;&nbsp;<\/span>and &#8216;<span style=\"color: #000080;\">VATT Guiding Camera&#8217;<\/span> windows should appear:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_TCI.png\"><img loading=\"lazy\" decoding=\"async\" width=\"251\" height=\"300\" class=\"alignnone wp-image-1088 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_TCI-251x300.png\" alt=\"\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_TCI-251x300.png 251w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_TCI.png 451w\" sizes=\"auto, (max-width: 251px) 100vw, 251px\" \/><\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_GCam.png\"><img loading=\"lazy\" decoding=\"async\" width=\"234\" height=\"300\" class=\"alignnone wp-image-1092 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_GCam-234x300.png\" alt=\"\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_GCam-234x300.png 234w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_GCam.png 423w\" sizes=\"auto, (max-width: 234px) 100vw, 234px\" \/><\/a> <\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h1 class=\"wp-block-heading\">III Selecting and sending targets to VATT<\/h1>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Click \u2018<span style=\"color: #333399;\">Program<\/span>\u2019 button on \u2018<strong><span style=\"color: #000080;\">PEPSI Spectrograph Control Interface<\/span><\/strong>\u2019:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_blocks.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1096 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_blocks-300x204.png\" alt=\"\" width=\"300\" height=\"204\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_blocks-300x204.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_blocks.png 746w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>When you\n<ol class=\"wp-block-list\">\n<li>already have an observing program, a &#8216;<span style=\"color: #000080;\">Observing Programmes<\/span>&#8216; window and a &#8216;<span style=\"color: #000080;\">Target Visibility Plot<\/span>&#8216; window opens. If not, go to &#8216;<span style=\"color: #000080;\">Table<\/span>&#8216; menu, choose &#8216;<span style=\"color: #000080;\">Open or Close Table<\/span>&#8216; and select the correct one.\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_prog.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1098 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_prog-300x198.png\" alt=\"\" width=\"300\" height=\"198\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_prog-300x198.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_prog.png 561w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n\n\n\n<li>If GUI had to be restarted, <span style=\"color: #993366;\">check that the correct program is open (YYYYMMDD.obs)!<\/span><\/li>\n\n\n\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_visibility.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1291 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_visibility-300x196.png\" alt=\"\" width=\"300\" height=\"196\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_visibility-300x196.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_visibility.png 691w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>\n<ol class=\"wp-block-list\">\n<li><strong><span style=\"color: #ff0000;\">select the target<\/span><\/strong>\u00a0(highlighted with teal colour) you want to observe and send it to VATT. This does not yet move the telescope!\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_tar_send.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1278 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_tar_send-300x197.png\" alt=\"\" width=\"300\" height=\"197\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_tar_send-300x197.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_tar_send.png 563w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n\n\n\n<li>Note that target can be sent already during CCD readout!<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>check that &#8216;<span style=\"color: #000080;\"><strong>PEPSI VATT Control Interface&#8217;<\/strong><\/span> has the same target as you chose, or resend:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_TCI_tar.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1103 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_TCI_tar-251x300.png\" alt=\"\" width=\"251\" height=\"300\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_TCI_tar-251x300.png 251w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_TCI_tar.png 451w\" sizes=\"auto, (max-width: 251px) 100vw, 251px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>check that \u2018<span style=\"color: #000080;\"><strong>PEPSI Spectrograph Control Interface<\/strong><\/span>\u2019 changed (target name, selected cross-dispersers, exposure time, etc.) according to selected target:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_PSCI_ok.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1281 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_PSCI_ok-300x197.png\" alt=\"\" width=\"300\" height=\"197\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_PSCI_ok-300x197.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_PSCI_ok.png 754w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n\n\n\n<li>Note that the changes happen only after CCD readout has finished.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>if you need to change pre-defined exposure times, click \u2018<span style=\"color: #000080;\">Edit fields<\/span>\u2019:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_prog_edit.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1108 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_prog_edit-300x198.png\" alt=\"\" width=\"300\" height=\"198\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_prog_edit-300x198.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_prog_edit.png 561w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>a new window pops up and you can make the changes:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_do_Target_edit.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1110 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_do_Target_edit-300x105.png\" alt=\"\" width=\"300\" height=\"105\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_do_Target_edit-300x105.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_do_Target_edit.png 754w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n\n\n\n<li>Note that values in \u2018<strong><span style=\"color: #000080;\">PEPSI Spectrograph Control Interface<\/span><\/strong>\u2019 do not change unless you send the target information again (see A.)<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>don\u2019t have any targets or you want to change targets\n<ol class=\"wp-block-list\">\n<li>click \u2018<span style=\"color: #000080;\">add another object<\/span>\u2019 in \u2018<span style=\"color: #000080;\">Observing programmes<\/span>\u2019 window:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/add_blocktarget.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-308 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/add_blocktarget-300x191.png\" alt=\"\" width=\"300\" height=\"191\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/add_blocktarget-300x191.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/add_blocktarget.png 540w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>a new window having targets pops up:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/targetlist.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-309 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/targetlist-300x241.png\" alt=\"\" width=\"300\" height=\"241\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/targetlist-300x241.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/targetlist.png 558w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>choose the target and send it to the observing program:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/send_newtarget.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-310 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/send_newtarget-300x241.png\" alt=\"\" width=\"300\" height=\"241\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/send_newtarget-300x241.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/send_newtarget.png 558w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Additional things to take into account when making observing programmes:\n<ul class=\"wp-block-list\">\n<li>The entire spectral range is from 383 to 912 nm but it&nbsp;<strong>can not<\/strong>&nbsp;be covered by a single exposure<\/li>\n\n\n\n<li>PEPSI has two arms, blue and red that cover specral ranges 383-544 nm and 544-912 nm, respectively<\/li>\n\n\n\n<li>Each arm has three cross-dispersers:\n<ul class=\"wp-block-list\">\n<li>CD1 383-426 nm in blue arm<\/li>\n\n\n\n<li>CD2 426-480 nm in blue arm<\/li>\n\n\n\n<li>CD3 480-544 nm in blue arm<\/li>\n\n\n\n<li>CD4 544-627 nm in red arm<\/li>\n\n\n\n<li>CD5 627-741 nm in red arm<\/li>\n\n\n\n<li>CD6 741-912 nm in red arm<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Simultaneously, one can observe one wavelength region in blue and one in red, however,&nbsp;<strong>CDs 3 and 4 can not be used at the same time<\/strong><\/li>\n\n\n\n<li>Exposure time depends on the used cross-disperser<\/li>\n\n\n\n<li>One can have different exposure times for cross-dispersers in blue and in red arm<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>continue as in III-2-a.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<\/li>\n\n\n\n<li><strong><span style=\"color: #ff0000;\">after the telescope operator gives the permission<\/span><\/strong>, click &#8216;<strong><span style=\"color: #000080;\">PRESET<\/span><\/strong>&#8216;:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_preset.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1112 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_preset-251x300.png\" alt=\"\" width=\"251\" height=\"300\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_preset-251x300.png 251w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_preset.png 451w\" sizes=\"auto, (max-width: 251px) 100vw, 251px\" \/><\/a><\/li>\n\n\n\n<li>&#8216;<span style=\"color: #000080;\">PRESET<\/span>&#8216; to next target can be done already during CCD readout.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h1 class=\"wp-block-heading\">IV Guiding<\/h1>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Click \u2018<span style=\"color: #000080;\">Guider<\/span>\u2019 to open guiding window to keep the target on the pinhole, check that \u2018<span style=\"color: #000080;\">Pause<\/span>\u2019 is unchecked:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_guiding.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1117 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_guiding-234x300.png\" alt=\"\" width=\"234\" height=\"300\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_guiding-234x300.png 234w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_guiding.png 423w\" sizes=\"auto, (max-width: 234px) 100vw, 234px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>When the telescope adapter has been connected, you should check the hot spot coordinates (direct reflected image position). If you see the image of the star on the pinhole (doughnut) spilling over asymmetrically, correct hot spot coordinates. As reference, summer 2019 values were x=880 and y=566.<\/li>\n\n\n\n<li>When you are happy with the plots in &#8216;<span style=\"color: #000080;\">VATT Guider<\/span>&#8216; window, <span style=\"color: #ff0000;\"><strong>start guiding<\/strong><\/span> by \u2018<span style=\"color: #000080;\">Start<\/span>\u2019:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_guider.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1120 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_guider-102x300.png\" alt=\"\" width=\"102\" height=\"300\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_guider-102x300.png 102w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_guider.png 337w\" sizes=\"auto, (max-width: 102px) 100vw, 102px\" \/><\/a><\/li>\n\n\n\n<li>The upper most plot shows the cross profiles of the target in both X and Y direction and they should overlap and converge to zero. The second plot from top shows the guider offset and third FWHM of the star. The bottom plot shows how much flux the guiding camera gets. This gives a good indication of passing clouds.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h1 class=\"wp-block-heading\">V Observing<\/h1>\n\n\n\n<p><span style=\"color: #ff0000;\"><strong>Start observations<\/strong><\/span> by clicking \u2018<span style=\"color: #000080;\">Start<\/span>\u2019 in \u2018<strong><span style=\"color: #000080;\">PEPSI Spectrograph Control Interface<\/span><\/strong>\u2019:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_start.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1122 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_start-300x195.png\" alt=\"\" width=\"300\" height=\"195\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_start-300x195.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_start.png 753w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">VI Viewing obtained spectra<\/h1>\n\n\n\n<p>It is good to take a look at the spectra in order to see if you should change exposure times etc.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Select the spectrum (highlighted with teal colour) you want to look at from &#8216;<span style=\"color: #000080;\">FITS Image Browser<\/span>&#8216; with Enter or click the arrow icon to send it to &#8216;<span style=\"color: #000080;\">Spectrum viewer<\/span>&#8216;. One can also look at multiple spectra by selecting them and clicking double arrow icon.\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_fitslist.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1284 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_fitslist-300x179.png\" alt=\"\" width=\"300\" height=\"179\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_fitslist-300x179.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_fitslist-768x458.png 768w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_fitslist-1024x610.png 1024w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_fitslist.png 1326w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>The active window in &#8216;<span style=\"color: #000080;\">Spectrum viewer<\/span>&#8216; has a <span style=\"color: #00ffff;\">cyan<\/span> frame. Select the area you want to look at closer by drawing a red box with, for example, a mouse:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/fitsview.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-319 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/fitsview-300x215.png\" alt=\"\" width=\"300\" height=\"215\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/fitsview-300x215.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/fitsview-768x551.png 768w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/fitsview-1024x735.png 1024w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/fitsview.png 1296w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>To see a summed spectrum of the selected area\n<ol class=\"wp-block-list\">\n<li>Press &#8216;<span style=\"color: #000080;\">Enter<\/span>&#8216;, <strong>or<\/strong><\/li>\n\n\n\n<li>Click the normal &#8216;<span style=\"color: #000080;\">Sigma<\/span>&#8216; icon (one dimensional cross-cut in horizontal direction) on top of the viewer (the other sigma makes it in vertical direction)\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/sigma.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-320 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/sigma-300x215.png\" alt=\"\" width=\"300\" height=\"215\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/sigma-300x215.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/sigma-768x551.png 768w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/sigma-1024x735.png 1024w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/sigma.png 1296w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/li>\n\n\n\n<li>Now you have a spectrum plot where you can see the ADUs:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_ADU.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1254 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_ADU-300x162.png\" alt=\"\" width=\"300\" height=\"162\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_ADU-300x162.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_ADU-768x415.png 768w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/VATT_ADU.png 786w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h1 class=\"wp-block-heading\">&nbsp;<\/h1>\n\n\n\n<h1 class=\"wp-block-heading\">VII Estimating S\/N<\/h1>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Select an area with mouse from highest continuum values to lowest (don&#8217;t be distracted by high fabry-perot peaks):\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Spect_view.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1243 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Spect_view-300x166.png\" alt=\"\" width=\"300\" height=\"166\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Spect_view-300x166.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Spect_view-768x424.png 768w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Spect_view-672x372.png 672w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Spect_view.png 773w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Click &#8216;<span style=\"color: #000080;\">Sun<\/span>&#8216; icon on top of the spectrum viewer:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/sun.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-322 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/sun-300x130.png\" alt=\"\" width=\"300\" height=\"130\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/sun-300x130.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/sun-768x333.png 768w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/sun-1024x444.png 1024w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/sun.png 1108w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>You get a pop-up window there the S\/N estimate is given, save that information into fits list by clicking &#8216;<span style=\"color: #000080;\">Save<\/span>&#8216;:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/SN.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-323 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/SN-300x203.png\" alt=\"\" width=\"300\" height=\"203\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/SN-300x203.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/SN.png 352w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">VIII Calibration frames<\/h1>\n\n\n\n<p>After the observing night is over, it is time to take the calibration<br>frames. Check that you have stopped guiding and guider camera is on pause.<\/p>\n\n\n\n<p>In the \u2018<strong><span style=\"color: #000080;\">PEPSI Spectrograph Control Interface<\/span><\/strong>\u2019 window:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Click &#8216;<span style=\"color: #000080;\">Calibs<\/span>&#8216; button to get a pop-up window:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_calib.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1125 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_calib-300x200.png\" alt=\"\" width=\"300\" height=\"200\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_calib-300x200.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_calib.png 750w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Check that for wanted fiber(s) ThAr, FPE, and Traces are chosen (summer 2019 130L is used):\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/calibration.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-490 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/calibration-300x130.png\" alt=\"\" width=\"300\" height=\"130\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/calibration-300x130.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2016\/12\/calibration.png 529w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Click &#8216;<span style=\"color: #000080;\">START<\/span>&#8216; button on Control Interface window:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_start.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1122 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_start-300x195.png\" alt=\"\" width=\"300\" height=\"195\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_start-300x195.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_start.png 753w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n\n\n\n<li>Note that calibration settings (exposure times, etc.) get visible in the control interface after pressing &#8216;Start&#8217;.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>When calibration frames are ready, click &#8216;<span style=\"color: #000080;\">Calibs<\/span>&#8216; again to close the calibration sequencer window and to be able to do anything else.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">IX Telemetry<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>It is essential to <strong><span style=\"color: #ff0000;\">check the telemetry<\/span><\/strong> from time to time:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Relevent_telemetry.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1295 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Relevent_telemetry-300x194.png\" alt=\"\" width=\"300\" height=\"194\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Relevent_telemetry-300x194.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Relevent_telemetry-768x495.png 768w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Relevent_telemetry-1024x661.png 1024w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Relevent_telemetry.png 1826w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>If something is wrong and you are not trained to fix the problem, contact a person who is!<\/strong><\/li>\n\n\n\n<li>The most important is the &#8216;<span style=\"color: #000080;\">Pressure<\/span>&#8216; in <span style=\"color: #000080;\"><strong>PEPSI Chamber<\/strong><\/span> window. If &#8216;In&#8217; value has <span style=\"color: #ff0000;\">red <\/span>background, and one sees that pressure curves follow each others, everything is not fine.\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Pressure.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1296 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Pressure-281x300.png\" alt=\"\" width=\"281\" height=\"300\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Pressure-281x300.png 281w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Pressure-768x819.png 768w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Pressure-960x1024.png 960w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/Pressure.png 1089w\" sizes=\"auto, (max-width: 281px) 100vw, 281px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Other important measure is &#8216;<span style=\"color: #333399;\">Dewar heater<\/span>&#8216; in <strong><span style=\"color: #333399;\">PEPSI CCD<\/span><\/strong> window. If it approaches 0, the dewar pressure rises and pumping is needed.\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/T_dev.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1299 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/T_dev-185x300.png\" alt=\"\" width=\"185\" height=\"300\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/T_dev-185x300.png 185w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/T_dev-633x1024.png 633w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/T_dev.png 731w\" sizes=\"auto, (max-width: 185px) 100vw, 185px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">X Troubleshooting<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If clicking anything at the interface does not work, try restarting the VPN connection<\/li>\n\n\n\n<li>When VATT computers have to be rebooted, the connection to them is lost and connection to VATT has to be re-established. This is done unchecking and re-checking the square VATT button in the main interface. If that does not work, then PEPSI software has to be closed and restarted.\n<ul class=\"wp-block-list\">\n<li>Close it by clicking <span style=\"color: #000080;\">x<\/span> in \u2018<span style=\"color: #000080;\"><strong>PEPSI Spectrograph Control Interface<\/strong><\/span>\u2019:\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_restart.png\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"203\" class=\"alignnone wp-image-1129 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_restart-300x203.png\" alt=\"\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_restart-300x203.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/05\/VATT_restart.png 747w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a> <\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Start opening as described in the beginning of the instructions. <\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>In case restarting the interface does not close VATT windows (VATT Telescope Control Interface, VATT Guiding Camera and VATT Guider), type in terminal killVATT<\/li>\n\n\n\n<li>You have problems with pointing if\n<ul class=\"wp-block-list\">\n<li>&#8216;<span style=\"color: #000080;\"><strong>PEPSI VATT Control Interface&#8217;<\/strong><\/span>&nbsp;Telescope section has either Azimuth or Altitude with red background<\/li>\n\n\n\n<li><span style=\"color: #000000;\">The cross profiles in<\/span><span style=\"color: #000080;\"> &#8216;VATT Guider<\/span>&#8216; window do not converge to zero\n<ul class=\"wp-block-list\">\n<li>Contact telescope operator in order to solve the situation!  <\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Sometimes the software program freezes or even crashes (STA Archon time out). If that\u00a0happens, find the following terminal\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/PEPSI_terminal-1.png\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"244\" class=\"alignnone wp-image-1229 size-medium\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/PEPSI_terminal-1-300x244.png\" alt=\"\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/PEPSI_terminal-1-300x244.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/PEPSI_terminal-1-768x625.png 768w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2019\/07\/PEPSI_terminal-1.png 785w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a> <\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>and type Ctrl+c, wait some time and start everything again by typing &#8216;pepsi&#8217;<\/p>\n\n\n\n<p>If terminal gives &#8216;Lost connection with Camera&#8217;, one can go to &#8216;PEPSI Control Unit&#8217; Maintenance, but in order to do that, <span style=\"color: #ff0000;\">you should know what you are doing<\/span>. Moxa-Power-Ccd Controllers, wait 10 seconds. In case of pressure problem, use again Maintenance.<\/p>\n\n\n","protected":false},"excerpt":{"rendered":"<p>29.11.2023 Summary This document describes how to observe with PEPSI at Vatican Advanced Technology Telescope (VATT). Observations are performed with following steps:I Accessing PEPSI GUIII Connecting with VATTIII Selecting and sending targets to VATTIV GuidingV Observing The document also describes following items:VI Viewing obtained spectraVII Estimating S\/NVIII Calibration framesIX TelemetryX Troubleshooting I Accessing PEPSI GUI &hellip; <a href=\"https:\/\/pepsi.aip.de\/?page_id=293\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Observing with VATT<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":5,"featured_media":0,"parent":137,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-293","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/pages\/293","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=293"}],"version-history":[{"count":228,"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/pages\/293\/revisions"}],"predecessor-version":[{"id":2181,"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/pages\/293\/revisions\/2181"}],"up":[{"embeddable":true,"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/pages\/137"}],"wp:attachment":[{"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=293"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}