3-17
Performance Tests
PDH/DSn Transmitter Output
3 Connect the PDH/DSn 75Ω OUT port to the Oscilloscope CHAN 1,
terminate in 75Ω.
4 Select CHAN 1 on the Oscilloscope and set to 1MΩ input impedance.
Load the Telecom Mask
5 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 139BIN1 in the
highlighted MSK FILES window.
d/ softkey.
Compare Pulse with Mask
6 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
7 The Oscilloscope will automatically display and compare an isolated
positivepulsewith the mask limits.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.
8 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
9 Select PATTERN [ALL 0’s] on the display.
TELECOM MASK/MASK
LOAD SETUP 8 M1M2
COMPARE
TEST ON
M1M2
AFTER FAIL CONTINUE
TRANSMIT
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