Keithley 2500 - Page 66

Model 2500 Service Manual Troubleshooting 4-7
Figure 4-2
Analog circuitry block diagram
Triax INPUT
20mA Max
R (Range 7 & 8)
R (Range 5 & 6)
R (Range 3 & 4)
R (Range 1 & 2)
X10
Enable
Floating
Channel 1/2
Ground
Output
Enable
Voltage Bias Source
0 to ±10V, ±100V
20mA Max
Earth
Connect
Voltage
Source
OUTPUT
X10
To
A/D
Converter
I/V Converter
Current
Range
Switching
Note: One channel shown