
Chapter 2 Service
Troubleshooting the Counter
160 Assembly-Level Service Guide
Summary of Remote Self-Test Verification
• Send command *TST?
• Wait 10 seconds.
• Retrieve query result:
– 0 indicates the self-test PASSED.
– Any value other than 0 indicates self-test FAILED.
• If the retrieved value is non-zero, read error queue: SYSTem:ERRor?
– Read errors until no more errors.
NOTE If you are able to read the error message(s), consult “Error
Messages” starting on page 163 for what to do after receiving a
specific calibration error message.
To Determine the Counter Firmware Version
Older firmware versions may have known or unknown problems in the
code. Verify the firmware for your counter as follows:
1Press the Help key, then the About softkey.
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