Keithley 2520 Service Manual page 78

4-6 Troubleshooting
Figure 4-1
Overall block diagram
Front Panel
Keypad
2 Line VFD
Microprocessor
DSP
SRAM
MC68332
Detector 1
D/A
10MHz
A/D
Detector 2
D/A
10MHz
A/D
Laser
D/A
10MHz
A/D
Model 2520 Pulsed Laser Diode Test System Service Manual
GPIB
RS-232
Digital I/O
Trigger Link
Voltage Source Detector 1
±20V, 100mA Max
I/V Converter Detector 1
(4 Current Ranges)
Voltage Source Detector 2
±20V,100mA Max
I/V Converter Detector 2
(4 Current Ranges)
Laser Diode Current Source
1A, 10V DC
5A, 9V Pulse
Voltage Measurement
(2 Voltage Ranges)
DETECTOR 1
DETECTOR 2
PULSED
OUT
PULSED
SENSE