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A-2
Specifications
The Model 2500 Dual Photodiode Meter can measure and display either photodiode current or optical power for
two photodiodes with appropriate user-supplied optical power gain/wavelength calibration factors.
Measurement Specifications
TEMPERATURE
ACCURACY
1, 2
COEFFICIENT
DC INPUT
MAXIMUM
23°C ±5°C
0°–18°C & 28°–50°C
IMPEDANCE
3
RANGE
RESOLUTION
±(% rdg. + offset)
±(%rdg. + offset)/°C
(Maximum)
2.000000 nA
1 fA
1.00% +
2 pA
0.01 + 200 fA
20 k
Ω
20.00000 nA
10 fA
0.40% +
2 pA
0.01 + 200 fA
20 k
Ω
200.0000 nA
100 fA
0.30% + 200 pA
0.02 + 20 pA
200
Ω
2.000000 µA
1 pA
0.20% + 200 pA
0.02 + 20 pA
200
Ω
20.00000 µA
10 pA
0.10% + 20 nA
0.01 +
2 nA
2.0
Ω
200.0000 µA
100 pA
0.10% + 20 nA
0.01 +
2 nA
2.0
Ω
2.000000 mA
1 nA
0.10% +
2 µA
0.02 + 200 nA
0.2
Ω
20.00000 mA
10 nA
0.10% +
2 µA
0.02 + 200 nA
0.2
Ω
MAXIMUM INPUT: ±20.0mA.
Typical Speed and Noise Rejection
4
READINGS/s
DIGITS
GPIB (SCPI) GPIB (488.1)
NPLC
NMRR
4
1
⁄
2
700
900
0.01
—
5
1
⁄
2
460
475
0.1
—
6
1
⁄
2
58
58
1
60 dB
Photodiode Voltage Bias Specifications
2
ACCURACY
MAXIMUM LOAD TEMPERATURE
RANGE
RESOLUTION
23°C ±5°C
CURRENT REGULATION
5
COEFFICIENT
0 to ±10 V
<400 µV
±(0.15% of setting
20 mA
< 0.30%,
150 ppm/°C
+ 5 mV)
0 to 20 mA
0 to ±100 V
<4 mV
±(0.3% of setting
20 mA
< 0.30%,
300 ppm/°C
+ 50 mV)
0 to 20 mA
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...