HP 37717C Calibration Manual page 233

C AU T I O N
N OTE
Performance Tests
STM-1/STM-4 Optical Interface (Options 130, 131)
71. Set the Dual Power Supply to +12V and -12V, then connect to the HP 83442A
O/E Converter and switch on.
Take care to connect the supply correctly as incorrect voltage or polarity could result
in damage to the HP 83442A. Refer to HP 83442A Operating Instructions, HP p/n
5091-6448A.
72. Press
TRANSMIT
[1550 nm].
73. Press
AUTOSCALE
obtain an STM-4 waveform.
74. Measure the amplitude of this STM-4 waveform using the oscilloscope and adjust
the Optical Attenuator until the amplitude is 150mV pk-pk.
If the input power is greater than -8 dBm then the Optical/Electrical converter is liable
to saturate.
75. Disconnect the output of the O/E Converter from the oscilloscope and connect
instead to the HP 37717C STM1/4 Optical Module Monitor Input.
76. Press on the HP 37717C
RECEIVE
and set up the display as shown opposite.
77. Press
TROUBLE SCAN
RESULTS
then to start the measurement.
RUN/STOP
78. After 5 minutes, check that NO
TROUBLE is displayed on the HP 37717C
display. Press
RESULTS
stop the measurement.
79. Recall the HP 37717C DEFAULT
SETTINGS as shown on 3-2.
80. Verify that the Optical Module LASER ON led is NOT lit indicating that the laser
is disabled before continuing.
81. Repeat steps 67 through 80, selecting SIGNAL [STM-1 OPT] [1550 nm] in step
72 and [STM-1 MON] in step 76.
82. Repeat steps 67 through 80, selecting SIGNAL [STM-0 OPT] [1550 nm] in step
72 and [STM-0 MON] in step 76.
83. Disconnect all the test equipment.
3-124
on the HP 37717C and select SIGNAL [STM-4 OPT]
SDH
on the oscilloscope and adjust the Timebase and Range to
to
RUN/STOP