Racal Instruments 3162A/B, User Manual

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User Manual 3162A/B
Maintenance and Performance Checks 5-25
6 RD – U37 pin 16 Negative going 400 ns width pulses
7 WR – U37 pin 17 Negative going 400 ns width pulses
8 LDACK – U37 pin 5 Negative going 6.5
µ
s width pulses
9 ASIC LCS – U91 pin 26 Negative going 6.5
µ
s width pulses
10 LR/W - U91 pin 18 Negative going 60
µ
s width pulses
Output Amplifier and
Amplitude Control
Checks
Problems with the output amplifier and amplitude control circuits can be
detected if the Model 3162B accepts word serial commands and responds
correctly to word serial queries, but fails to output the correct waveform with
correct amplitude and offset levels. If there is a problem with the output
amplifier or with the amplitude control circuit, proceed with the checkout
procedure given in Table 5-2.
Before starting the following procedure, reset the Model 3162B to the factory
defaults using the *RST command. Then send the command:
: :OUTP ON.
:INST:SEL B
:OUTP ON
Table 5-2, Output Amplifier and Amplitude Control Checks
S t e p Engine Board A Test Point Expected Result
1 P1 connector (output amplifier input) 600 mVp-p sinewave, 1 MHz
2 U5, pin 6 Approximately 1 Vp-p sinewave, +6 V offset
3 U6, pin 6 Approximately 1 Vp-p sinewave, -6 V offset
4 U4, pin 2 -7 V dc
5 U2, pin 2 +7 V dc
Engine Board B Test Point
6 U13, pin 6 1.2 Vp-p sinewave, 1 MHz
7 U4, pin 6 Approximately 1 Vp-p sinewave, +6 V offset
8 U5, pin 6 Approximately 1 Vp-p sinewave, -6 V offset
9 U3, pin 2 -7 V dc
10 U1, pin 2 +7 V dc