Picotest M3500A User Manual page 114

input capacitor C614. This produces a pulse on the output of the
rms-to-dc converter which is sampled 100ms after the current is applied.
A 20ms A/D measurement is performed and checked against a limit of 2V
to 13V into the ADC.
622 DC 10V reference failed This test configures to the 10V dc range
with 5V input applied. A 20ms ADC measurement is performed and the
result is checked against a limit of 4.55V ± 0.15mV.
624 Unable to sense line frequency The supplied voltage AC2 is
routed through a comparator U4 to generate a logic input signal. This
test checks that the logic input from U4 to panel MCU U3 is toggling. If no
logic input is detected, the instrument will assume 50Hz line operation
for all future measurements.
650 Front-End MCUs Firmware Version Error (System Error)
660 Firmware Version Error
661 External Memory Verion Error
662 Calibration Version Error
663 Scanner card Version Error
664 Temperature Version Error
665 GPIB Version Error
666 RS-232 Version Error
668 Manual Calibration Version Error
669 Self-Test Version Error
670 Command Version Error
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