3-72
Performance Tests
STM-1/STS-3 Transmitter Output Waveshape
3 Press and enter the calibration password -
1243. Set up the display as shown opposite.
4 Connect the 52/155 Mb/s 75Ω DATA OUT port to the Oscilloscope,
terminate in 75Ω.
5 Select CHAN on the Oscilloscope and set to 1MΩ input impedance.
Load the Telecom Mask
6 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 155BIN1 in the
highlighted MSK FILES window.
d/ softkey.
Compare Pulse with Mask
7 On the Oscilloscope, use the following key sequence to compare the
pulse with the mask:
a/ RECALL 8, (Ensure CH1 Impedance is reset to 1M
Ω)
c/ softkey
d/ softkey
e/ softkey
f/ softkey
g/ RUN
OTHER
CALIBRATION
TELECOM MASK/MASK
LOAD SETUP 8 M1M2
COMPARE
TEST ON
M1M2
AFTER FAIL CONTINUE
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