HP 37718A Installation And Verification Manual page 129

N OT E
Performance Tests
STM-0/STS-1 Transmitter Output Waveshape
Load the Telecom Mask
9 On the oscilloscope, use the following key sequence to select and load
the required Telecom Mask:
a/ SHIFT (Blue Key) APPLICATION.
b/
TELECOM MASK/MASK
c/ Use ENTRY/MEASURE control to select STS1_93 in the
highlighted MSK FILES window.
d/
LOAD SETUP 8 M1M2
Compare Pulse with Mask
10 On the oscilloscope, use the following key sequence to compare the
pulse with the mask:
a/ RECALL 8
b/ DEFINE MEAS
c/ softkey
COMPARE
d/ softkey
TEST ON
e/ softkey
M1M2
f/
AFTER FAIL CONTINUE
g/ RUN
11 The oscilloscope will automatically display and compare an isolated
positive pulse with the mask limits. A PASS message should appear on
the Oscilloscope
It may be necessary to select
visibly fit the waveform to the mask by adjusting the oscilloscope vertical
gain/position and horizontal delay to obtain a PASS on the Mask.
12 Measure the peak pulse amplitude at the mid pulse-width using the
oscilloscope and verify that this is nominally 530 mV.
13 Change the signal to STM-0/STS-1 HIGH and check that the +ve and
-ve pulses are nominally 1 V.
14 Change the signal to STM-0/STS-1 LOW and check that the +ve and -
ve pulses max) peaks are nominally 300 mV.
softkey.
softkey.
softkey
and
MASK MASK AUTO MASK ALIGN
to
/
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