3-49
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/ softkey.
c/ Use ENTRY/MEASURE control to select DS_1E in the highlighted
MSK FILES window.
d/ softkey.
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
d/ softkey
e/ softkey
f/ softkey
g/ RUN
15 The Oscilloscope will automatically display and compare an isolated
positivepulsewith the masklimits.A PASSmessage should appearon
the Oscilloscope.
NOTE 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
TELECOM MASK/MASK
LOAD SETUP 8 M1M2
COMPARE
TEST ON
M1M2
AFTER FAIL CONTINUE
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