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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 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 Treshold" 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 also 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/PX4 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.

o Sometimes no spectrum will appear if the "Input Offset" is set incorrectly. For the X-123 the Input Offset is set by

apotentiometer on the DP4. See the DP4 User's Manual for more information on setting the Input Offset.

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

software. Then open the software and plug in the X-123 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 DP4/PX4

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

X-123 Quick Start Guide Rev A1

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