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Performance Tests
External Mux/Demux
7 Measure the peak pulse amplitude at the mid pulse-width using the
Oscilloscope and verify that this is between 1.896V and 2.844V.
DS-1 Negative Pulse
8 On the Oscilloscope, use the following key sequence to access the
inverted mask.
a/ SHIFT (Blue Key) DISK
b/ softkey
c/ Use ENTRY/MEASURE control to highlight INV_MASK
d/ softkey
Load the Telecom Mask
9 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 DS1_NEW in the
highlighted MSK FILES window.
d/ softkey.
Compare Pulse with Mask
10 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. Select
TRIGGER, SETUP and set softkey to ).
b/ DEFINE MEAS
c/ softkey
d/ softkey
e/ softkey
f/ softkey
g/ RUN
NOTE Using the balanced to unbalanced converter reduces the pulse amplitude
by a factor of 1.266. This will cause the comparison with the mask to fail.
To overcome this select CHAN 1 ON and reduce the Volts/Division setting
(highlightedonthe softkeydisplay).ReducedVolts/Division= highlighted
value/1.266. The new value can be entered using the keypad
11 TheOscilloscopewillcomparethenegativepulsewiththemasklimits.
A PASS message should appear on the Oscilloscope.
DIRECTORY
CHANGE DIRECTORY
TELECOM MASK/MASK
LOAD SETUP 8 M1M2
PATTERN TRIGGER Trig’d
COMPARE
TEST ON
M1M2
AFTER FAIL CONTINUE
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