Analog Circuit Checks; Table 4-5 Analog Circuit Checks - Keithley 2182 Service Manual

Analog circuit checks

Table 4-5
voltages to the channel 1 input terminals and measuring voltages at the indicated test points. See
Figure 1-1
Table 4-5
Analog circuit checks
Step Item/component
1 Function
2 Input connections
3 Measurement range
4 Input voltage
5 U601 pin 6
6 TP652
7 Measurement range
8 Input voltage
9 TP651
10 TP652
11 Measurement range
12 Input voltage
13 TP651
14 TP652
15 Measurement range
16 Input voltage
17 TP651
18 TP652
19 Measurement range
20 Input voltage
21 TP651
22 TP652
Notes: 1. Before testing, disable autozero by sending the following command over the remote interface:
:SYST:AZERO:STAT OFF.
2. All voltage measurements referenced to TP303.
summarizes checks for the analog circuits. These tests involve applying specific test
in Section 1 for DC voltage input test connection.
Required condition
DCV1
CH1 HI and LO
100V
100V
+1V
+10V
10V
+10V
+10V
+10V
1V
+1V
+1V
+10V
100mV
+100mV
+100mV
+10V
10mV
+10mV
+1V
+10V
Troubleshooting
Remarks
Use DCV1 for measurements.
Connect voltage source to CH1.
Select 100V range.
Apply 100V to CH1 input.
Buffer output.
Multiplexer output to A/D.
Select 10V range.
Apply 10V to CH1 input.
Preamp output.
Multiplexer output to A/D.
Select 1V range.
Apply 1V to CH1 input.
Preamp output.
Multiplexer output to A/D.
Select 100mV range.
Apply 100mV to CH1 input.
Preamp output.
Multiplexer output to A/D.
Select 10mV range.
Apply 10mV to CH1 input.
Preamp output.
Multiplexer output to A/D.
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