HP 37718A Installation And Verification Manual page 105

Performance Tests
SDH/SONET Frequency Offsets
6 Connect the Signal Generator, Timebase OUT port (rear panel), to the
counter Timebase IN port (rear panel).
7 Check the Counter EXT TIME BASE flag is illuminated on the front
panel.
8 Connect the HP 37718A/19A Multirate Analyzer module CLOCK
TRIGGER port to the Frequency Counter, set input termination to
Ω
50 .
9 Adjust the Frequency Counter Trigger Level to obtain a stable
reading.
10 The reading should be between 51.839999 - 51.840001MHz. If not
check setup and ensure the Counter is locked to the Signal Generator.
11 Set the HP 37718A/19A frequency offset to the settings given in Table
3-2 and verify the frequency at each step is within the Min/Max limits.
Table 3-2
Offset
(ppm)
-999ppm
-100ppm
-66.6ppm
+33.3ppm
+100ppm
+999ppm
12 Disconnect all the test equipment.
SDH/SONET Offset
Min Expected
Frequency
51788210.8 Hz
51834814.9 Hz
51836546.4 Hz
51841725.2 Hz
51845182.9 Hz
51891787.1 Hz
Max Expected
Frequency
51788212.9 Hz
51834817.1 Hz
51836548.5 Hz
51841727.3 Hz
51845185.1 Hz
51891789.2 Hz
3-65