HP 37718A Installation And Verification Manual page 111

N OT E
Performance Tests
External Mux/Demux
Load the Telecom Mask
18 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
19 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
20 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.
21 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.
DS-1 Mux and Demux
1 Connect the UUT balanced DS-1 Insert and Drop ports to the DS-1
Balanced Ports of the Test Set and repeat steps 3 through 10
substituting DS-1 for 2Mb/s and DS-3 for 34Mb/s.
DS-1 Positive Pulse
2 Disconnect the UUT 100Ω DROP port from the Test Set and connect
to the Oscilloscope via the HP 15508B Balanced to unbalanced
Converter. Terminate in 75Ω at the Oscilloscope input.
softkey.
softkey.
softkey
3-43