Keithley 2500 User Manual page 364

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
ACCURACY
MAXIMUM 23°C ±5°C
RANGE RESOLUTION ±(% rdg. + offset)
2.000000 nA 1 fA 1.00% +
20.00000 nA 10 fA 0.40% +
200.0000 nA 100 fA 0.30% + 200 pA
2.000000 µA 1 pA 0.20% + 200 pA
20.00000 µA 10 pA 0.10% + 20 nA
200.0000 µA 100 pA 0.10% + 20 nA
2.000000 mA 1 nA 0.10% +
20.00000 mA 10 nA 0.10% +
MAXIMUM INPUT: ±20.0mA.
Typical Speed and Noise Rejection
READINGS/s
DIGITS GPIB (SCPI)
4 1 ⁄ 700
2
5 1 ⁄ 460
2
6 1 ⁄ 58
2
Photodiode Voltage Bias Specifications
ACCURACY
RANGE RESOLUTION 23°C ±5°C
0 to ±10 V <400 µV ±(0.15% of setting
+ 5 mV)
0 to ±100 V <4 mV ±(0.3% of setting
+ 50 mV)
NOTES:
1. Speed = Normal (1.0 NPLC), Filter On.
2. 1 year.
3. Measured as ∆V
/∆I at full scale (and zero) input currents.
in in
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
/∆I at full scale (20mA) and zero load currents.
in in
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
at full scale (20mA) vs. zero input currents.
in
Analog Output Specifications
OUTPUT VOLTAGE RANGE 1 : OUTPUT IS INVERTING: -10V out for positive full scale input
OUPUT IMPEDANCE: 1kΩ typical.
ACCURACY
23°C ±5°C
RANGE ±(%output + offset)
2.000000 nA 6.0% + 90mV
20.00000 nA 3.0% + 9mV
200.0000 nA 6.0% + 90mV
2.000000 µA 3.0% + 9mV
20.00000 µA 6.0% + 90mV
200.0000 µA 2.5% + 9mV
2.000000 mA 6.0% + 90mV
20.00000 mA 2.5% + 9mV
1 The analog output voltage for each channel is referenced to that channel's floating ground.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
TEMPERATURE
1, 2 COEFFICIENT
0°–18°C & 28°–50°C IMPEDANCE
±(%rdg. + offset)/°C
2 pA 0.01 + 200 fA
2 pA 0.01 + 200 fA
0.02 + 20 pA
0.02 + 20 pA
0.01 + 2 nA
0.01 + 2 nA
2 µA 0.02 + 200 nA
2 µA 0.02 + 200 nA
4
GPIB (488.1) NPLC NMRR
900 0.01
475 0.1
58 1 60 dB
2
MAXIMUM LOAD
CURRENT REGULATION 5
20 mA < 0.30%,
0 to 20 mA
20 mA < 0.30%,
0 to 20 mA
(2502 only)
+10V out for negative full scale input
TEMPERATURE
COEFFICIENT RISE TIME
0°C - 18°C & 28°C - 50°C Typical
±(%output + offset)/°C (10% to 90%)
0.30% + 7mV 6.1 ms
0.11% + 700µV 6.1 ms
0.30% + 4mV 395 µs
0.11% + 400µV 395 µs
0.30% + 4mV 135 µs
0.11% + 400µV 135 µs
0.30% + 4mV 21 µs
0.11% + 400µV 21 µs
Typical Noise Floor Measurement Specification
RANGE
2.000000 nA
20.00000 nA
200.0000 nA
2.000000 µA
20.00000 µA
DC INPUT
200.0000 µA
3
2.000000 mA
(Maximum)
20.00000 mA
20 kΩ
20 kΩ
SOURCE CAPACITANCE: Stable to 10.0nF typical.
200 Ω
INPUT BIAS CURRENT
200 Ω
INPUT VOLTAGE BURDEN
2.0 Ω
VOLTAGE SOURCE SLEW RATE: 3.0ms/V typical.
2.0 Ω
COMMON MODE VOLTAGE: 200VDC.
0.2 Ω
0.2 Ω COMMON MODE ISOLATION: Typically 10
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%
TEMPERATURE
LINE FREQUENCY: 50, 60Hz.
COEFFICIENT
POWER DISSIPATION: 60VA.
150 ppm/°C
WARRANTY: 1 year.
EMC: Complies with European Union Directive 89/336/EEC.
300 ppm/°C
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
Bench configuration (with handle and feet): 104mm high ×
238mm wide × 370mm deep (4
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.
Specifications are subject to change without notice.
GENERAL
TYPICAL NOISE FLOOR
RMS (1 STDEV), 100 SAMPLES
0.01 NPLC 0.1 NPLC 1.0 NPLC
2 pA 1 pA 40 fA
2 pA 1 pA 40 fA
200 pA 100 pA 2 pA
200 pA 100 pA 2 pA
20 nA 10 nA 200 pA
20 nA 10 nA 200 pA
2 µA 1 µA 25 nA
2 µA 1 µA 25 nA
7 : 50fA max. @ 23°C.
8 : 4.0mV max.
Ω in parallel with 150nF.
9
in × 8 in × 14
1 ⁄ 3 ⁄ 9 ⁄ in).
2 8 16
in × 9 in × 14
1 ⁄ 3 ⁄ 9 ⁄ in).
8 8 16
6
10 NPLC
15 fA
15 fA
500 fA
500 fA
50 pA
50 pA
5 nA
5 nA
HW 4/22/02