3-23
Performance Tests
Multiple PDH Transmitter Outputs (Options UHC, [US6])
The waveform shape is also checked by comparing with the special ITU masks.
These may be obtained from the oscilloscope memory (if this feature is fitted) or can
be traced from the attached figures and compared with a printout of the oscilloscope
waveform. The relative delay at each output is also verified using the second channel
of the oscilloscope.
Equipment Required
Procedure
1. Recall the HP 37717C DEFAULT SETTINGS as shown on 3-2.
704 kb/s Output Pulse
2. Connect the PDH SIGNAL OUT 2 port to the Oscilloscope Channel 1. Set the
Oscilloscope termination to 1MΩ.
Steps 3 to 16 are only valid for Option UKK, [USB].
3. Press and set up the
display as shown opposite.
4. Press on the
oscilloscope.
5. Adjust the Oscilloscope Timebase and
Delay to position the positive peak pulse
amplitude at mid-pulse-width point in the
centre of the screen.
Oscilloscope : HP 54503A
120/75Ω Bal/Unbal Converter : HP 15508C
ThinkJet Printer : HP 2225A
TRANSMIT
AUTOSCALE
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