5-20 Chadwick-Helmuth A Business Unit of Honeywell International, Inc.
Chapter 5 - Maintenance And Repair
ad. Repeat steps r through ac for the Velocimeter channel and magnetic pickup channel
combinations listed in Table 5-4.
5.5.2.4 Channel Crosstalk Test
This test measures the amount of energy induced by a signal on another 8520C channel. This is done
by placing a signal level on one channel and then measuring the relative signal amplitude of the other
channels listed in Table 5-5.
a. Connect cable 8278 to Velocimeter channel 1 and remove cable 10502 from magnetic
pickup channel. Set up signal generator as follows:
(1) For channel connected to magnetic pickup input, set to Frequency = 100.00 +/-
0.1 Hz, Waveform = Sine wave, Amplitude = 19.0 mV pk.
(2) Monitor signal generator output with spectrum analyzer with marker at 100 Hz.
Adjust signal generator output channel connected to Velocimeter input until
amplitude is 13.44 +/- 0.05 mV RMS.
b. Press SPECTRUM key on 8500C/C+.
c. Press SETUP key.
d. Key in 1000 <Hz> with numeric keys.
e. Select SEEK field with arrow keys.
f. Press CHANGE soft key to select <SEEK OFF>.
g. Select INPUT field with arrow keys.
Table 5-5. Suggested 8520C Velocimeter Channel Crosstalk Combinations
Velocimeter
Channel
(Cable 8278)
Velocimeter
Channels
(selected one at a time in test
step)
12-12
23-12
34-12
45-12
56-12
67-12
78-12
89-12
910-12
10 11-12
11 12
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