3-6
Performance Tests
PDH Internal Transmitter Clocks (Options UKK, [USB], UKJ, [USA])
PDH Internal Transmitter Clocks (Options UKK, [USB],
UKJ, [USA])
Specifications
Description
This test verifies that the PDH transmit data rates are within limits. These limits
assume the instrument is within the annual calibration cycle. The Frequency Offset
capability (deviation from Standard Bit Rate) is also tested here.
The test uses a Frequency Counter connected to the PDH Signal Out port to measure
the data rate on an "all ones" pattern. This gives an indirect measure of the internal
transmitter clock frequency as the data is clocked by the internal clock oscillator.
Because the Frequency Counter triggers from the positive pulses only, the frequency
count will be half the selected data rate.
Equipment Required
Bit Rate Option Specification
139.264 MHz UKJ, [USA], UKK, [USB] 139.264 MHz ± 626.28 Hz
34.368 MHz UKJ, [USA], UKK, [USB] 34.368 MHz ± 154.66 Hz
8.448 MHz UKJ, [USA], UKK, [USB] 8.448 MHz ± 38.0 Hz
2.048 MHz UKJ, [USA], UKK, [USB] 2.048 MHz ± 9.22 Hz
704 kHz UKK, [USB] 704 kHz ± 3.17 Hz
Frequency Counter : HP 5335A Option 010
75Ω Termination : HP 15522-80010
T Connector : HP 1250-0781
To Next Page
Loading...
Need help?
General
