Amptek X-123SDD Panduan Memulai Cepat - Halaman 4

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Notes and Troubleshooting:

o By default, the software accumulates the counts (MCA mode). During set-up it may be convenient to use "DELTA"

mode, where counts are not integrated but are updated every second (i.e. only one second's worth of data are displayed

every second). Click the toolbar icon marked "MCA/DELTA Mode" to toggle between DELTA and MCA mode.

o If no spectrum appears, check that the system is acquiring data. The "Status" on the right hand Info Panel should read

"acquiring."

o Sometimes no spectrum will appear if PUR is enabled and the Fast Threshold is set improperly (in the DPP Properties-

Shaping tab). Turn PUR off and check if the spectrum appears. If it does then the Fast Threshold needs to be set

correctly. Remove any source from in front of the detector and click the "Tune Fast Threshold" button. Put the source

back and check if the spectrum appears. If it does not then you will have to adjust it manually as described below.

o The Fast and Slow Thresholds can be adjusted manually. First turn off PUR as described above. Then click the cursor to

channel 1 and press F8. This will set the Slow Threshold (LLD) to channel 1. This will show the noise of the system.

Click the cursor just to the right of the noise and then press F8. Press the "A" key to clear. There should be no counts

accumulating. Now put the device into "Delta" mode by clicking the Delta button on the toolbar. Open the DPP

Properties and go to the Shaping page. Adjust the Fast Threshold until 5 to 15 counts per second appear in the Input

Counts in the right-hand Info Panel. Now turn on PUR and click OK. Click the Delta button to get back to normal MCA

mode and put the source back in front of the detector. The Input Counts should slightly exceed the Counts at low count

rate.

o If problems persist there may be a communication or configuration problem. Unplug the X-123SDD power and close the

software. Then open the software and plug in the X-123SDD power adapter. In the bottom left-hand corner of the

software you should see a "1 Detected" for the USB connection. Once you see this, click on Connect. Then go to the

DPP Properties page and reload the appropriate default configuration as discussed above and try the acquisition again.

X-123SDD Quick Start Guide Rev A1

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