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flashed on the WDCA display. The queue will store the messages until the
queue is cleared by the clear queue key or by reading all the errors remotely.
"Help" on page 2-21 offers more information on how to access or clear system
errors.
Chapter 7, "Status Listings", gives detailed information on all the messages
and errors that may be reported.
Isolating Instrument Problems
Try to determine which of the two system components, the TLS or the WDCA,
is causing the problem. The TLS and the WDCA are calibrated independently
with no requirement to be tested together as a matched pair. The only
requirement is for the TLS to have the necessary level of firmware to be iden-
tified by and function with the WDCA. If possible, substitute replacement
instruments and repeat the measurement.
• Be certain you are not observing a problem caused by dirty connectors. Thor-
oughly clean all connections and repeat the measurement. For more informa-
tion see "Cleaning Connections for Accurate Measurements" on page 8-11.
• Verify the connections between the instruments. There must be an optical ca-
ble connection between the TLS output and the WDCA input, a GPIB cable
connecting the TLS to the auxiliary GPIB port on the WDCA, and a BNC cable
connecting the TLS output trigger and the WDCA trigger input. Refer to "Front
Panel Configuration" on page 1-34 and to "Rear Panel Configuration" on page
1-35 for more information.
Amplitude related errors
You can isolate amplitude related errors by connecting a fiber optic cable
between the TLS output and the WDCA input 1. Use an FC-PC (WDCA) and
an FC/APC (TLS) single mode optical fiber.
• In continuous sweep mode the output from the laser should be a stable -10 dBm
signal. A missing or erratic signal would indicate a problem with the fiber or ei-
ther system component.
• Perform a normalization with the fiber optic cable in place. A flat line should
appear at the reference level. With the scale per division changed to 0.1dB, you
should observe a flat line with no variation.
• Connect the TLS output to a power meter and observe the power level. If the
power remains constant, this indicates the WDCA is causing the error.
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Maintenance
Troubleshooting
8-3
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