Mb/S Additional Output Delay; Mb/S Output Pulse - HP 37717C Calibration Manual

Performance Tests
Multiple PDH Transmitter Outputs (Options UHC, [US6])

2.048 Mb/s Additional Output Delay

30. Connect the PDH SIGNAL OUT 1 port to the Oscilloscope Channel 1. Set the
Oscilloscope termination to 1M .
31. Connect the PDH SIGNAL OUT 2 port to the Oscilloscope Channel 2. Set the
Oscilloscope termination to 1M .
32. Check that the pulse on Channel 2 is 4 bits delayed with respect to the pulse on
Channel 1.
33. Disconnect the SIGNAL OUT 2 port from the oscilloscope and connect the
SIGNAL OUT 3 port to the oscilloscope Channel 2.
34. Check that the pulse on Channel 2 is 8 bits delayed with respect to the pulse on
Channel 1.
35. Disconnect the SIGNAL OUT 3 port from the oscilloscope and connect the
SIGNAL OUT 4 port to the oscilloscope Channel 2.
36. Check that the pulse on Channel 2 is 12 bits delayed with respect to the pulse on
Channel 1.
37. Ensure that the ratio of +ve and -ve pulse amplitudes is between 0.95 and 1.05.
38. Ensure that the ratio of +ve and -ve pulse widths is between 0.95 and 1.05.

8.448 Mb/s Output Pulse

39. Connect the PDH SIGNAL OUT 2 port to the Oscilloscope Channel 1.
40. Press and set up the
TRANSMIT
display as shown opposite.
41. Press on the
AUTOSCALE
oscilloscope.
42. Adjust the Oscilloscope Timebase and
Delay to position the positive peak pulse
amplitude at mid-pulse-width point in the
centre of the screen.
43. Measure the peak pulse amplitude at
mid-pulse-width using the Oscilloscope
and verify that this is between 2.133V and 2.607V.
44. Select the 8Mb/s G703 Mask on the oscilloscope and store it on the Display.
45. Press SHIFT on the oscilloscope to automatically align the pulse
AUTOSCALE
to the mask. Verify that the pulse falls within the mask as shown in Figure 3-17.
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