3151 And 3151A User Manual
Maintenance and Performance Checks 5-21
Output Amplifier
and Amplitude
Control Checkout
Problems with the output amplifier and amplitude control circuits can
be detected if the Model 3151/3151A 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 3151/3151A
to the factory defaults using the *RST command. Then send the
command OUTPUT ON.
Table 5-2, Output Amplifier and Amplitude Control Checkout Procedure
Step
Test Point
Expected Result
1
Junction of R57 and R58
750 mVp-p sinewave, 1 MHz
2
Junction of R18 and R19
10 Vp-p sinewave, 1 MHz
3
Voltage across R37, R41, R46, and R49
Approximately 1.6 V
4
CE voltage on Q9
Approximately 2.8 V
5
U7, pin 1
Approximately -1.1 V
6
U7, pin 7
Approximately 400 mV
7
Change amplitude setting to 1.61V and offset setting to 7V
8
U8, pin 1
Approximately -320 mV
9
U8, pin 7
Approximately -2 V
Содержание 3151
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