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Performance Tests
PDH/DSn Frequency Measurement and Looped Clock
PDH/DSn Frequency Measurement and Looped Clock
Specifications
NOTE The Rates available are dependent on the HP 37718A/19A option
Description
This test verifies that the HP 37718A/19A Receiver Frequency
Measurement is within specified limits. These limits assume the
instrument is within the calibration cycle.
A Synthesizer is used to generate a sinewave at half the data rate. This
is applied to the HP 37718A/19A Receiver Signal In port. As this signal
corresponds to an All Ones Ternary Signal, the HP 37718A/19A receiver
should sync up with no errors if set to PATTERN [ALL ONES]. The
Frequency Measurement accuracy of the HP 37718A/19A can be
determined by comparison with the frequency displayed on the
Synthesizer. Frequency Offset Measurement is also verified during this
test as the HP 37718A/19A 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 37718A/19A DEFAULT SETTINGS as shown on page 3-
4.
2 Connect up the equipment as shown in Figure 3-3.
Accuracy 4.5 ppm
Measured Offset 100 ppm
Synthesizer
: HP 3335A Option 001 (75Ω)
Frequency Counter : HP 5335A Option 010
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