Manual - 8500A Series Peak Power Meter - Giga-tronics

Theory of Operation
A5 Test Points
The test points in Table 4-4 can be checked for the correct signals on the A5 Delay Line board:
Table 4-4. A5 Test Points
Test Point
TP1
TP2
TP3
TP4
TP5
TP6
TP7
TP8
TP9
TP10
TP11
TP12
TP13
TP14
TP15
TP16
TP17
TP18
Description
Output of U29A. Trigger signal that tells when the board has been
triggered and reset. Can trigger a scope when testing the board.
Signal goes low at trigger and high at sample time.
-5.2 V
5 V Common
+5 V
Clock Frequency (C79 adjusts)
Output of U36, U37 DAC, which determines the 0 to 25.5 ns
threshold.
U34 comparator input
U34 comparator input
U37B hold amplifier output
10 V Reference
U34 comparator output
5 V Common
U39 comparator output (trigger signal)
U39 comparator output (trigger signal)
U40. Trigger level DAC
+15 V
15 V Common
-15 V
Manual No. 20790, Rev C, November 1998 4-19
Superceded by Revision D, March 2009