3-28
Performance Tests
PDH/DSn Transmitter Output
c/ Use ENTRY/MEASURE control to select DS3_92 in the highlighted
MSK FILES window.
d/ softkey.
Compare Pulse with Mask
11 On the Oscilloscope, use the following key sequence to compare the
pulse with the mask:
a/ RECALL 8
b/ DEFINE MEAS
c/ softkey
d/ softkey
e/ softkey
f/ softkey
g/ RUN
12 The Oscilloscope will automatically display and compare an isolated
positivepulsewith the masklimits.A PASSmessage should appearon
the Oscilloscope.
NOTE It may be necessary to select and / to
visibly fit the waveformto the mask by adjusting the Oscilloscope vertical
gain/position and horizontal delay to obtain a PASS on the Mask.
13 Measure the peak pulse amplitude at the mid pulse-width using the
Oscilloscope and verify that this is nominally 560 mV.
14 Set the signal to HIGH and check that the peak pulse
amplitude is approximately 0.9V.
15 Set the signal to LOW and check that the peak pulse
amplitude is approximately 0.3V.
Procedure - DSX-1
Positive Pulse
1 Recall the HP 37718A/19A Default Settings as shown on page 3-4.
2 Connect the DSn 100Ω OUT port to the Oscilloscope via the HP
15508B Balanced to unbalanced Converter and terminate in 75Ω at
the Oscilloscope input.
3 Select the Transmitter Output page.
LOAD SETUP 8 M1M2
COMPARE
TEST ON
M1M2
AFTER FAIL CONTINUE
MASK MASK AUTO MASK ALIGN
TRANSMIT
TRANSMIT
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