HP 37718A Installation And Verification Manual page 132

N OTE
Performance Tests
STM-1/STS-3 Transmitter Output Waveshape
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/
TELECOM MASK/MASK
c/ Use ENTRY/MEASURE control to select 155BIN1 in the
highlighted MSK FILES window.
d/
LOAD SETUP 8 M1M2
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
c/ softkey
COMPARE
d/ softkey
TEST ON
e/ softkey
M1M2
f/
AFTER FAIL CONTINUE
g/ RUN
8 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.
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
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/
TELECOM MASK/MASK
3-64
softkey.
softkey.
softkey
OTHER
CALIBRATION
softkey.
Ω
)
display.