HP 37717C Calibration Manual page 141

N OTE
Figure 3-19
Performance Tests
Multiple PDH Transmitter Outputs (Options UHC, [US6])
84. Press
TRANSMIT
display as shown opposite.
85. Press
AUTOSCALE
oscilloscope.
86. Select the BIN1 140 Mb G.703 mask on
the oscilloscope and store it on the display.
87. Adjust the Oscilloscope Timebase and
Delay to position the positive peak pulse
amplitude at mid-pulse-width point in the
centre of the screen.
88. Measure the peak pulse amplitude at mid-pulse-width using the Oscilloscope and
verify that this is between 0.900V and 1.100V.
89. Press SHIFT
AUTOSCALE
to the mask. Verify that the pulse falls within the mask as shown in Figure 3-20.
90. Repeat steps 87 to 89 with the Oscilloscope Channel 1 connected to SIGNAL
OUT 3 and SIGNAL OUT 4 in turn.
If your oscilloscope does not have the Mask feature, obtain a printout of the displayed
pulse. Place the mask shown in Figure 3-19 over the pulse and ensure that the pulse
falls within the mask (a transparent copy of the mask should be used).
140 Mb/s Pulse Mask All 1's
3-32
and set up the
on the
on the oscilloscope to automatically align the pulse