6 Troubleshooting
116 E4416A/E4417A Power Meters Service Guide
Introduction
This chapter enables qualified service personnel to diagnose suspected faults
with the power meter Rmt I/O (Remote Input/Output) signal lines and
RS232/422 serial port.
If there is a problem when attempting to use the RS232/422 serial interface or
the remote I/O functions, consult the User's Guide and confirm that all the
user setups are correct before proceeding with the following fault finding flow
charts.
Suggested Diagnostic Equipment
1 Digital multi- meter capable of measuring voltage and resistance, for
example, Agilent E4975.
2 Signal source capable of producing 300 ms TTL single shot pulses, for
example, Agilent 33120A.
3 +5 V TTL logic level source.
4 RS232 self test connector −9 way 'D' type female connector with the
following pins wired together:
• Pin 2 (Rx)to Pin 3 (Tx).
• Pin 4 (DTR)to Pin 6 (DSR).
• Pin 7 (RTS)to Pin 8 (CTS).
5 RS422 self test connector - 9 way 'D' type female connector with the
following pins wired together:
• Pin 1 (CTS−)to Pin 9 (RTS−).
• Pin2 (Rx−)to Pin 4 (Tx−).
• Pin 3 (Tx+)to Pin6 (Rx+).
• Pin7 (RTS+)to Pin 8 (CTS+).
6 8 way RJ45 plug with flying leads wired to pins 2, 3, 4, 5 and 6 to apply and
monitor signals on the remote TTL I/O connector.
7 GPIB controller and cable - required to apply "*RST" command through the
rear panel GPIB connector.
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