3-73
Performance Tests
PDH Frequency Measurement and Looped Clock (Options UKK, [USB],
UKJ, [USA], UKL, [USC], UKN, [USE])
PDH Frequency Measurement and Looped Clock
(Options UKK, [USB], UKJ, [USA], UKL, [USC], UKN,
[USE])
Specifications
Description
This test verifies that the HP 37717C Receiver Frequency Measurement is within
specified limits. These limits assume the instrument is within the annual calibration
cycle.
A Synthesizer is used to generate a sinewave at half the data rate. This is applied to
the HP 37717C Receiver Signal In port. As this signal corresponds to an All Ones
Ternary Signal, the HP 37717C receiver should sync up with no errors if set to
PATTERN [ALL ONES]. The Frequency Measurement accuracy of the HP 37717C
can be determined by comparison with the frequency displayed on the Synthesizer.
Frequency Offset Measurement is also verified during this test as the HP 37717C
will display deviation from the expected Signal In frequency in ppm. The PDH
transmitter recovered clock function is also verified at 2 Mb/s using the frequency
counter in RATIO mode.
Equipment Required
Procedure
1. Recall the HP 37717C DEFAULT SETTINGS as shown on 3-2.
2. Connect up the equipment as shown in Figure 3-33.
Accuracy ±7 ppm
Measured Offset ±100 ppm
Synthesizer : HP 3335A Option 010 (75Ω)
Frequency Counter : HP 5335A Option 010
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