3-73
Performance Tests
STM-1/STS-3 Transmitter Output Waveshape
8 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.
9 Measure the peak pulse amplitude at the mid pulse-width using the
Oscilloscope and verify that this is between 450 mV and 550 mV. (i.e.
900 mV-1.1V Pk-Pk)
All 0’s Pulse
10 Select PATTERN [ALL 0’s] on the display.
Load the Telecom Mask
11 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 155BIN0 in the
highlighted MSK FILES window.
d/ softkey.
Compare Pulse with Mask
12 On the Oscilloscope, use the following key sequence to compare the
pulse with the mask:
a/ RECALL 8, (Ensure CH1 Impedance is reset to 1MΩ)
b/ DEFINE MEAS
c/ softkey
d/ softkey
e/ softkey
f/ softkey
g/ RUN
13 The Oscilloscope will automatically display and compare an isolated
positivepulsewith the mask limits.A PASSmessage should appearon
the Oscilloscope.
OTHER
CALIBRATION
TELECOM MASK/MASK
LOAD SETUP 8 M1M2
COMPARE
TEST ON
M1M2
AFTER FAIL CONTINUE
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