HP 16555A, Service Manual

Page: 78 / 141

To test the time interval accuracy
Testing the time interval accuracy does not check a specification, but does check the
following:
•
125 MHz oscillator
Multicard modules must be reconfigured as one-card modules for this test.
This test verifies that the 125 MHz timing acquisition synchronizing oscillator is
operating within limits.
Equipment Required
Equipment Critical Specifications Recommended
Model/Part
Pulse Generator 100 MHz 3.5 ns pulse width, <600 ps rise time HP 8131A Option 020
Function Generator Accuracy
≤
(5)(10
−
6
)
×
frequency HP 3325B Option 002
SMA Cable HP 8120-4948
Adapter BNC(m)-SMA(f) HP 1250-2015
BNC Test Connector,
6x2
Set up the equipment
1
Turn on the equipment required and the logic analyzer. Let them warm up for
30 minutes if you have not already done so.
2
Set up the pulse generator according to the following table.
Pulse Generator Setup
Channel 1 Period Mode EXT TRIG
Delay: 0 ps 5
µ
s TRIG Slope: Positive
Width: 2.5
µ
s THRE: 1.0 V
High:
−
0.9 V
Low:
−
1.7 V
COMP: Disabled
(LED off)
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