3-30
Performance Tests
PDH/DSn Transmitter Output
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
8 The Oscilloscope will compare the positive pulse with the mask limits.
A PASS message should appear on 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 1.896V and 2.844V.
Negative Pulse
10 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
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 DS1_NEW 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 1M
Ω. Select
TRIGGER, SETUP and set softkey to ).
b/ DEFINE MEAS
DIRECTORY
CHANGE DIRECTORY
TELECOM MASK/MASK
LOAD SETUP 8 M1M2
PATTERN TRIGGER Trig’d
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