2500 and 2502 Dual Photodiode Meters
The Models 2500 and 2502 Dual Photodiode Meters can measure and display
either photodiode current or optical power for two photodiodes with appro-
priate user-supplied optical power gain/wavelength calibration factors.
The Model 2502 includes an analog output jack on the rear panel for each
channel.
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
GENERAL
Typical Noise Floor Measurement Specification
6
TYPICAL NOISE FLOOR
RMS (1 STDEV), 100 SAMPLES
RANGE 0.01 NPLC 0.1 NPLC 1.0 NPLC 10 NPLC
2.000000 nA 2 pA 1 pA 40 fA 15 fA
20.00000 nA 2 pA 1 pA 40 fA 15 fA
200.0000 nA 200 pA 100 pA 2 pA 500 fA
2.000000 µA 200 pA 100 pA 2 pA 500 fA
20.00000 µA 20 nA 10 nA 200 pA 50 pA
200.0000 µA 20 nA 10 nA 200 pA 50 pA
2.000000 mA 2 µA 1 µA 25 nA 5 nA
20.00000 mA 2 µA 1 µA 25 nA 5 nA
SOURCE CAPACITANCE: Stable to 10.0nF typical.
INPUT BIAS CURRENT
7
: 50fA max. @ 23°C.
INPUT VOLTAGE BURDEN
8
: 4.0mV max.
VOLTAGE SOURCE SLEW RATE: 3.0ms/V typical.
COMMON MODE VOLTAGE: 200VDC.
COMMON MODE ISOLATION: Typically 10
9
Ω in parallel with 150nF.
OVERRANGE: 105% of measurement range.
MEMORY BUFFER: 6000 readings (two 3000 point buffers). Includes
selected measured value(s) and time stamp.
PROGRAMMABILITY: IEEE-488 (SCPI-1995.0), RS-232, five user-
definable power-up states plus factory default and *RST.
DIGITAL INTERFACE:
Enable: Active low input.
Handler Interface: Start of test, end of test, 3 category bits. +5V @
300mA supply.
Digital I/O: 1 trigger input, 4 TTL/Relay Drive outputs (33V @
500mA, diode clamped).
POWER SUPPLY: 100V/120V/220V/240V ±10%
LINE FREQUENCY: 50, 60Hz.
POWER DISSIPATION: 60VA.
WARRANTY: 1 year.
EMC: Complies with European Union Directive 89/336/EEC.
VIBRATION: MIL-T-28800F Random Class 3.
SAFETY: Complies with European Directive 73/23/EEC.
WARM-UP: 1 hour to rated accuracy.
DIMENSIONS: 89mm high × 213mm wide × 370mm deep
(3
1
⁄
2
in × 8
3
⁄
8
in × 14
9
⁄
16
in).
Bench configuration (with handle and feet): 104mm high ×
238mm wide × 370mm deep (4
1
⁄
8
in × 9
3
⁄
8
in × 14
9
⁄
16
in).
WEIGHT: 23.1kg (10.5 lbs).
ENVIRONMENT:
Operating: 0°–50°C, 70% R.H. up to 35°C non-condensing. Derate
3% R.H./°C, 35°–50°C.
Storage: –25° to 65°C, non-condensing.
HW 4/22/02
NOTES:
1. Speed = Normal (1.0 NPLC), Filter On.
2. 1 year.
3. Measured as ∆V
in
/∆I
in
at full scale (and zero) input currents.
4. Dual channel, internal trigger, measure only, display off, Autorange off, Auto Zero off, source delay = 0,
filters off, limits off, CALC5 and CALC6 off, 60Hz.
5. Measured as ∆V
in
/∆I
in
at full scale (20mA) and zero load currents.
6. Noise floor measured as rms (1 standard deviation), 100 samples, Filter off, open (capped) input.
7. Specification by design.
8. Measured (at input triax) as ∆V
in
at full scale (20mA) vs. zero input currents.
Specifications are subject to change without notice.
Analog Output Specifications (2502 only)
OUTPUT VOLTAGE RANGE
1
: OUTPUT IS INVERTING:
-10V out for positive full scale input
+10V out for negative full scale input
OUPUT IMPEDANCE: 1kΩ typical.
TEMPERATURE
ACCURACY COEFFICIENT RISE TIME
23°C ±5°C 0°C - 18°C & 28°C - 50°C Typical
RANGE ±(%output + offset) ±(%output + offset)/°C (10% to 90%)
2.000000 nA 6.0% + 90mV 0.30% + 7mV 6.1 ms
20.00000 nA 3.0% + 9mV 0.11% + 700µV 6.1 ms
200.0000 nA 6.0% + 90mV 0.30% + 4mV 395 µs
2.000000 µA 3.0% + 9mV 0.11% + 400µV 395 µs
20.00000 µA 6.0% + 90mV 0.30% + 4mV 135 µs
200.0000 µA 2.5% + 9mV 0.11% + 400µV 135 µs
2.000000 mA 6.0% + 90mV 0.30% + 4mV 21 µs
20.00000 mA 2.5% + 9mV 0.11% + 400µV 21 µs
1
The analog output voltage for each channel is referenced to that channel’s floating ground.
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