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Section 7
Troubleshooting and Maintenance
7.1 Troubleshooting Guide
The following troubleshooting guide is intended to isolate and solve prob-
lems with the power meter so that, to the greatest extent possible, the return
of the power meter/detector system to Newport will be unnecessary. For the
problems that cannot be resolved with information in this manual, or for
other situations that are not covered in this section, please call Newport’s
Application Engineers for advice. If necessary, see Section 8 for details on
returning your entire system to Newport for service.
Symptom Possible Fault/Correction
Blank display. Voltage selector switch not in the
correct position or fuse blown. Press the
RESET button.
Display shows 000 as the No calibration module connected at
serial number at power-up. power-up. Power off the meter, check
that the module is properly inserted,
and then power-up again.
Display shows “OL”. Indicates that the signal is too large for
the selected signal range. Select a
higher range, use auto-ranging, or use an
attenuator if one is available.
Display shows “SA”. Indicates that the input signal level
exceeds the specified saturation current
of the detector being used with the
meter. This level is detector dependent.
Reading is different See Table 5 Common Measurement
than expected. Errors, Section 4.6.
Reading never changes. Calibration module not properly in-
serted at power-up. Meter not in the run
mode - press the R/S key.
RS-232 communication does Check the echo mode state, the string
not seem to work. termination character, and the back
panel baud rate switch settings. Check
the RS-232 cable connection and cable
pinouts on Figure 7. Make sure that the
device talking to the meter is setup for 8
data bits, no parity, and 1 stop bit.
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