Agilent Technologies 86038B User Manual page 288

If the PDLA cannot communicate with the TLS or MWM
When the application launches, it attempts to contact the
tunable laser source, the test set, and the multi-wavelength
meter (when applicable). If there is any difficulty in contacting
these instruments, error messages will be displayed and the
application may not launch fully. There is a 30-minute time-out
for contacting the TLS as the TLS takes at least 12 minutes to
fully boot.
If there is any difficulty in contacting these instruments, ensure
that there is power to the test set, and refer to "Troubleshooting
GPIB Communications Problems" on page 289.
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Agilent 86038B Photonic Dispersion and Loss Analyzer, Second Edition