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 kΩ
20.00000 nA 10 fA 0.40% + 2 pA 0.01 + 200 fA 20 kΩ
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
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