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1. Ensure the fans are plugged in and working.
2. Turn on the master power button above the middle NIM rack (blue circle in Fig. 13).
3. Turn on the computer.
4. Turn on the NaI(Tl) detector electronics (right-hand NIM rack next to iSEG crate, the right red circle in Fig. 13), only after ensuring that the fan under it is working.
5. Turn on the fast signal processing electronics (left-hand NIM rack, the left red circle in Fig. 13).
6. Turn on the iSEG voltage crate power found behind the unit near the power cord.
7. Launch the iSEG control software at the NGR computer (Fig. 14).
   
   
   
   Figure 14. iSEG Hard ware Setup and Main screen. The controller cards may be the EHS or EHQ model and are labeled accordingly.
   
   
   
8. Make sure the voltages (Vset) for ESQ00/EHS00 and EHQ01/EHS01 are set (Fig. 15). Modify the Vset fields as follows:
   
   • Channel 0 = 0 (unused and available for spare channel)
   • Channels 1 and 7 = 1100 V (plastic scintillators in the doors)
   • All other channels = 1300 V (shell-shaped plastic scintillators)
   • If one of the channels on the EHS/EHQ modules has failed, Channel 0 may be in use—be sure you understand which scintillators are connected to which channels, because the door and hoop PMTs require different operating voltages! 
   
   Image ModifiedImage Modified
   Figure 15. EHS/EHQ 00 and 01 iSEG Multi-Channel HIgh-Voltage Modules Screens; VRamp and IRamp fields are circled in red.
   
   
9. Make sure voltage ramp (VRamp) is 5% or lower and the current ramp (IRamp) is 50% or lower. The iSEG software does not remember these values between sessions!
10. Click on the Module access menu and click Instructions for all channels > On (ctrl+o) to start ramping up the voltage.
11. Wait until ramp-up completes (1–2 minutes if proper values are used).
12. Exit the iSEG program.
13. Answer No to the prompt when asked to ramp voltages back down. If you answered Yes inadvertently, start again at Step 8.

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1. Use the empty 150 cm whole-round core liner with the background label; this is normally stored on the top of the core rack next to the NGRL. Load it onto the Ti boat.
2. In the NGRL configuration/System Setup dialog window (Fig. 16) change the settings to: no data reduction, live time, 21,000 seconds acquisition time.
3. In the NGRL configuration/File and Folders window verify the data folder (so you can find the background files later).
4. Click on “Core Analyzer”> “Summary Display” tab, Use the barcode scanner to scan the background label on the core liner.
5. Run the experiment (same run button as for sample analysis); this will take ca. 12 hours.
6. After the run is complete, copy the 16 background files from the c:\data\ngr\ archive to c:\data\ngr\.config\background\[EXP#]\data folder, where EXP# is the current expedition (you will have to create this folder).
7. In the NGRL configuration/File and Folders window indicate (select current folder) this Directory as the background; the files should appear in the window.
8. Important! Return the acquire time to 300 seconds and turn “reduce data” back on.
   

   Figure 16. Typical background file acquisition parameters in NGR configuration dialog window; note background acquire time should be 21,000 seconds, not 20,000.

   
   

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