Keithley 2520, Service Manual, Page: 118 / 137

HW
Rev. D
2/26/03
2520 Pulsed Laser Diode Test System
LASER DIODE PULSE OR DC CURRENT SOURCE SPECIFICATIONS
DRIVE CURRENT OFF CURRENT
4
SOURCE
RANGE
PROGRAMMING
RESOLUTION
APPROX.
ELECTRICAL
RESOLUTION ACURACY
1,6
± (% rdg. + mA)
2,3
RMS NOISE
(typical)
(1kHz-20MHz) RANGE
PROGRAMMING
RESOLUTION
APPROX.
ELECTRICAL
RESOLUTION ACURACY
1
± (% rdg. + mA)
0-500 mA 10 μA 8 μA 0.2 + 0.45 70 μA 0-15 mA 1 μA 7 nA typ. 0.2 + 0.45
0 – 1.0 A DC
0 – 5.0 A Pulse
100 μA 80 μA 0.2 + 4.5 800 μA 0-150 mA 10 μA 70 nA typ. 0.2 + 4.5
TEMPERATURE COEFFICIENT (0°-18°C & 28°-50°C):
r
(0.15 x accuracy
specification)/°C.
PULSE ON TIME
19
: 500ns to 5ms, 100ns programming resolution.
PULSE OFF TIME
19
: 20μs to 500ms, 10μs programming resolution.
PULSE DUTY CYCLE
19, 20, 21
: 0 to 99.6% for
”
1.0A;
0 to 4% for > 1.0A.
VOLTAGE COMPLIANCE: 3V to 10V, 10mV programming resolution
5
.
POLARITY: 1 quadrant source, polarity reversal available through internal
relay inversion.
OUTPUT OFF: <200m
:
short across laser diode; measured at Remote Test
Head connector.
RISE/FALL
TIME
6,8,9,10
SETTING AND
RANGE LOAD
7
PULSE
MODE PULSE
OVERSHOOT
6 8 9
TYPICAL MAX.
500mA 10 : ¼ Watt Fast 1.0% 55 ns 80 ns
500mA
10
:
¼ Watt
Slow 0.1% 1 μs 1.3 μs
5.00A 1.5 : 1 Watt Fast 1.0% 100 ns 130 ns
5.00A
1.5
:
1 Watt
Slow 0.1% 1 μs 1.3 μs
LASER DIODE VOLTAGE MEASURE SPECIFICATIONS
RANGE
MINIMUM
RESOLUTION
ACURACY
± (% rdg. + volts)
1,12
RMS NOISE (typical)
13
5.00 V 0.33 mV 0.3% + 6.5 mV 60 μV
10.00 V 0.66 mV 0.3% + 8 mV 120 μV
TEMPERATURE COEFFICIENT (0°-18°C & 28°-50°C): r (0.15 x accuracy specification)/°C.
MAX. LEAD RESOLUTION: 100
:
for rated accuracy.
INPUT IMPEDANCE: 2M : differential, 1M : from each input to common. Input bias current ±7.5μA max.
PHOTODIODE VOLTAGE BIAS SOURCE SPECIFICATIONS
(each channel)
RANGE:
0 to ±20VDC.
PROGRAMMING RESOLUTION: 10mV.
ACCURACY: ±(1% + 50mV).
CURRENT:
160mA max. with V-Bias shorted to I-Measure.
RMS NOISE (1kHz to 5MHz):
1mV typical.
PHOTODIODE CURRENT MEASURE SPECIFICATIONS
(each channel)
RANGE
MINIMUM
RESOLUTION
4
DC INPUT
IMPEDANCE
ACURACY
± (% rdg. + current)
1,2
RMS NOISE (typical)
3
10.00 mA 0.7 μA
< 10
: 0.3% + 20 μA 90 nA
20.00 mA 1.4 μA < 6 : 0.3% + 65 μA 180 nA
50.00 mA 3.4 μA
< 3
: 0.3% + 90 μA 420 nA
100.00 mA 6.8 μA < 2.5 : 0.3% + 175 μA 840 nA
TEMPERATURE COEFFICIENT (0°-18°C & 28°-50°C):
r
(0.15 x accuracy specification)/°C.
INPUT PROTECTION: The input is protected against shorting to the associated channel’s internal bias
supply. The input is protected for shorts to external supplies up to 20V for up to 1 second with no damage,
although calibration may be affected.
SYSTEM SPEEDS
Reading Rates (ms)
15,16
Number of
Source Points
17
To Memory To GPIB
1 5.3 6.8
10
[18]
9.5 18
100
[18]
48 120
1000
[18]
431 1170
GENERAL SPECIFICATIONS
DCFLOATING VOLTAGE: User may float common ground up to
±10VDC from chassis ground.
COMMON MODE ISOLATION: >10
9
: .
OVERRANGE: 105% of range on all measurements and voltage
compliance.
SOURCE OUTPUT MODES:
Fixed DC Level
Fixed Pulse Level
DC Sweep (linear, log and list)
Pulse Sweep (linear, log and list)
Continuous Pulse (continuous – low jitter)
PROGRAMMABILITY: -IEEE-488 (SCPI-1995.0), RS-232, 5 user-
definable power-up states plus factory default and *RST.
DIGITAL INTERFACE:
Safety Interlock : External mechanical contact connector and removable
key switch.
Aux. Supply: +5V @ 300mA supply.
Digital I/O:
2 trigger input, 4 TTL/Relay Drive outputs (33V @
500mA max., diode clamped).
Tlink:
6 programmable trigger input/outputs.
Pulse Trigger Out BNC: +5V, 50
:
output impedance, output trigger
corresponding to current source pulse; pulse to trigger delay <100ns.
See Figure 3.
MAINS INPUT: 100V to 240V rms, 50-60Hz, 140VA.
WARRANTY: 1 year.
EMC:
Conforms to European Union Directive 89/336/EEC (EN61326-1).
SAFETY: Conforms to European Union Directive 73/23/EEC (EN61010-
1) CAT 1.
VIBRATION: MIL-PRF-28800F Class 3, Random.
WARM-UP: 1 hour to rated accuracy.
DIMENSIONS, WEIGHT:
Main Chassis, bench configuration (with handle & feet): 105mm
high × 238mm wide × 416mm deep (4 1/8 in. × 9 3/8 in. × 16 3/8
in.). 2.67kg (5.90 lbs).
Remote Test Head: 95mm high × 178mm deep (with interlock key
installed) × 216mm wide (3 1/2 in. × 7 in. × 8 1/2 in.). 1.23kg (2.70
lbs).
ENVIRONMENT:
Operating: 0°-50°C, 70% R.H. up to 35°C. Derate 3% R.H./°C, 35°-
50°C.
Storage: -25° to 65°C.
A-6 Specifications Model 2520 Pulsed Laser Diode Test System Service Manual