HP 37718A Installation And Verification Manual page 89
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N OT E
Performance Tests
External Mux/Demux
2.048 Mb/s Positive Pulse
11 Disconnect the UUT 75Ω DROP port from the Test Set and connect to
the Oscilloscope. Terminate in 75Ω at the Oscilloscope input.
12 Select CHAN 1 on the Oscilloscope and set to 1MΩ input impedance.
Load the Telecom Mask
13 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 DS_1E in the highlighted
MSK FILES window.
d/
LOAD SETUP 8 M1M2
Compare Pulse with Mask
14 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
15 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 visibly fit the waveform to the mask by adjusting
the Oscilloscope vertical position and horizontal delay to obtain a PASS
on the Mask.
16 Measure the peak pulse amplitude at the mid pulse-width using the
Oscilloscope and verify that this is between 2.133V and 2.607 Volts.
2.048 Mb/s Negative Pulse
17 On the Oscilloscope, use the following key sequence to access the
inverted mask.
a/ SHIFT (Blue Key) DISK
softkey.
softkey.
softkey
3-49
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