Troubleshooting
4-13
Analog circuitry checks
summarizes analog circuitry checks.
Table 4-4
Analog circuitry checks
Step
Item/component
Required condition*
Remarks
0
1
0
2
0
3
0
4
0
5
0
6
0
7
0
8
0
9
10
11
12
13
14
15
16
17
18
INPUT #1
TP312
TP318
INPUT #2
TP512
TP518
Source 1
TP308
TP306, TP311
Source 1
TP308
TP306, TP311
Source 2
TP508
TP506, TP511
Source 2
TP508
TP506, TP511
Apply +20mA
-10V
Pulses
Apply +20mA
-10V
Pulses
10V range, output
-2V
+10V
100V range, output
-2V
+100V
10V range, output
-2V
+10V
100V range, output
-2V
+100V
Select chan 1 20mA range.
Chan 1 I/V converter output.
Chan 1 A/D input signal(s).
Select chan 2 20mA range.
Chan. 2 I/V converter output.
Chan 2 A/D input signal(s).
Set channel 1 source to +10V.
Ch. 1 DAC output.
Ch. 1 source output.
Set channel 1 source to +100V.
Ch. 1 DAC output.
Ch. 1 source output (OUTPUT ON).
Set channel 2 source to +10V.
Ch. 2 DAC output.
Ch. 2 source output (OUTPUT ON).
Set channel 2 source to +100V.
Ch. 2 DAC output.
Ch. 2 source output (OUTPUT ON).
*Voltage source steps (8-18) are with OUTPUT ON. Source 1 voltages reference to A_GND TP. Source 2 voltages referenced to
B_GND TP.
Summary of Contents for 2500
Page 2: ...Contains Calibrating and Servicing Information Model 2500 Dual Photodiode Meter Service Manual...
Page 11: ......
Page 13: ......
Page 15: ......
Page 16: ...1 PerformanceVerification...
Page 28: ...2 Calibration...
Page 56: ...3 RoutineMaintenance...
Page 59: ...3 4 Routine Maintenance Model 2500 Service Manual...
Page 60: ...4 Troubleshooting...
Page 74: ...5 Disassembly...
Page 81: ...5 8 Disassembly Model 2500 Service Manual...
Page 82: ...6 ReplaceableParts...
Page 93: ...6 12 Replaceable Parts Model 2500 Service Manual...
Page 94: ...A Specifications...
Page 98: ...B CalibrationReference...
Page 108: ...C CalibrationProgram...
Page 117: ......
Page 119: ......
Page 120: ......
Page 121: ...Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 Printed in the U S A...