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176 Service Procedures
Appendix D
7. Remove the short at JM101.
8. Turn off and reassemble the function generator, taking particular care
to avoid damaging the cover’s EMC gasket. Do not over-tighten the
BNC connector nuts as the connector bodies are insulating plastic.
9. The function generator is now unsecured and you can enter a new
security code. Be sure you take note of the new security code.
Calibration Count
The calibration count feature provides an independent “serialization” of your
calibrations. You can determine the number of times that your function
generator has been calibrated. By monitoring the calibration count, you can
determine whether an unauthorized calibration has been performed. Since
the value increments by one for each calibration, a complete calibration
increases the value by approximately 85 counts.
• The calibration count is stored in non-volatile memory and does not
change when power has been off or after a remote interface reset. Your
function generator was calibrated before it left the factory. When you
receive your function generator, read the calibration count to
determine its value.
• The calibration count increments up to a maximum of 32,767 after
which it wraps around to 0. There is no way provided to program or
reset the calibration count. It is an independent electronic calibration
“serialization” value.
Calibration Message
You can use the calibration message feature to record calibration information
about your function generator. For example, you can store such information
as the last calibration date, the next calibration due date, the function
generator's serial number, or even the name and phone number of the person
to contact for a new calibration.
You can record information in the calibration message only from the remote
interface. You can read the message from either the front-panel menu or the
remote interface.
• The calibration message may contain up to 40 characters. The function
generator can display up to 11 characters of the message on the front
panel; any additional characters are truncated.
• The calibration message is stored in non-volatile memory, and does
not change when power has been off or after a remote interface reset.