Keithley 2520 Service Manual page 119

Model 2520 Pulsed Laser Diode Test System Service Manual
2520 Pulsed Laser Diode Test System
Notes
1
1 year, 23°C ±5°C.
2
If Duty Cycle ·1 exceeds 0.2, accuracy specifications must be derated with an additional error
term as follows:
500mA Range: ±0.1% rdg. · D ·1
5A Range:
where:
This derating must also be applied for a period equal to the time that
3
Not including overshoot and setting time.
4
Pulse mode only.
5
Output: 500mA DC on 500mA range and 1A DC on 5A range.
6
Refer to 2520 Service Manual for test setup of current accuracy.
7
Figures 1 and 2 are typical pulse outputs into resistive loads.
8
Typical
9
Per ANSI/IEEE Std 181-1977.
10
Per ANSI/IEEE Std 181-1977 10% to 90%.
11
DC accuracy ±700mV @ output terminal. 0.2 typical output impedance.
12
At DC, 10μs measurement pulse width, Filter off.
13
Standard deviation of 10,000 readings with 10μs pulse width, filter off, with I source set to 0
amps DC.
14
The A/D converter has 14 bit resolution. The useful resolution is improved by reading averaging.
The useful resolution is:
Range
Useful Resolution
14
2
15
Excluding total programmed (Pulse ON time + Pulse OFF time).
16
Front panel off, calc off, filter off, duty cycle < 10%, binary communications.
17
Returning 1 voltage and 2 current measurements for each source point.
18
Sweep mode.
19
Valid for both continuous pulse and sweep modes.
20
Shown is the Power Distribution % based on current settings.
pw
/
21
Timing Cycle ( ): 4% max.
+
(pw pd)
Specifications are subject to change without notice.
±0.3% rdg. · D ·1
I = current setting
D = duty cycle
D ·I was
1
Pulse Width (ns) 400ns
Averaging Filter Setting
100ns
Pulse Waveform Flatness - 500mA Into 20 Ohms
0.6
Full Pulse
0.5
0.4
Current
0.3
(A)
0.2
0.1
0
0 5
Figure 1
0.2.
Pulse Waveform Flatness - 5A into 2 ohms
6
Full Pulse
5
4
Current
(A) 3
2
1
0
0 5
Figure 2
Pulse Output/Trigger Output Relationship
6
5
4
3
Volts
2
1
0
-1
-2
-1.00E-06 -5.00E-07
Figure 3
Specifications
0.515
0.51
0.505
Expanded Pulse Top
Current
0.5
(A)
0.495
0.49
0.485
10 15 20 25
Time ( s)
5.06
5.04
5.02
Expanded Pulse Top
Current
5 (A)
4.98
4.96
4.94
10 15 20 25
Time ( s)
Trigger
Pulse
0.00E+00 5.00E-07 1.00E-06 1.50E-06
Time
Rev. D
2/26/03
A-7
HW