Amptek MCA8000D 빠른 시작 매뉴얼 - 페이지 6

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Troubleshooting the DPPMCA Software

If you cannot connect to the MCA8000D check the following:



Was the software correctly installed?



Were the drivers properly installed?



Are all the cables connected?



Is the MCA8000D power plugged in?

If you start an acquisition but see no counts:



Is there an isotopic source in front of the detector or is the X-ray tube turned on?



Is the MCA8000D configured properly?

o If you do not see any counts, change the channels to 1024 and set the threshold to 50 as a starting point.

Are the input polarity and offset correct?



The MCA8000D only accepts positive going shaped pulses with no DC offset. Pulses of the wrong polarity

or with an incorrect input offset will be outside the range of the ADC and therefore not measured. Verify

the input polarity and input offset are correct.

Are pulse selection settings rejecting everything?



The pile-up rejection or Gate inputs will reject from the spectrum events which do not meet certain criteria

(discussed in the manuals). If the system is configured incorrectly, it is quite common for no pulses to be

recorded. Turn off PUR and Gate while you are setting up and debugging the system. Most systems will

work best with PUR enabled, once everything else is configured properly.

Is the threshold correct?



The LLD threshold should always be set above the noise of the system. If you see nothing, try setting the

threshold to channel 50 and then try the acquisition again.

If you still do not see a spectrum or the correct spectrum, save a .mca file from the File menu and email it to

[email protected]. This files contains important information that will help Amptek troubleshoot the problem. Do

not send screen shots or any other type of file. Only the .mca file is needed.

Custom Software

The MCA8000D is NOT backwards compatible with theMCA8000A. It uses a completely different

communication protocol. As a result, if you have written custom software using the MCA8000A DLL Package, it

will not work with the MCA8000D. It will be necessary to re-write any custom software using the Software

Development Kit (SDK).

Proper Use of Equipment

If the equipment is used in a manner not consistent with the specifications, the protection provided by the

equipment may be impaired.

Amptek Inc.

MCA8000D Quick Start Guide Rev A0

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