HP 37718A Installation And Verification Manual page 71

N OT E
N OT E
Performance Tests
PDH/DSn Transmitter Output
c/ softkey
COMPARE
d/ softkey
TEST ON
e/ softkey
M1M2
f/
AFTER FAIL CONTINUE
g/ RUN
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
(highlighted on the softkey display). Reduced Volts/Division = highlighted
value/1.266. The new value can be entered using the keypad
13 The Oscilloscope will compare the negative 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.
14 Measure the peak pulse amplitude at the mid pulse-width using the
Oscilloscope and verify that this is between 1.896V and 2.844V.
15 Set the
TRANSMIT
amplitude reduces by approximately 20% and pulse shape has slower
rise/fall edges.
16 Disconnect all the test equipment.
softkey
signal to LOW and check that the peak pulse
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