Keithley 2520, Service Manual, Page: 17 / 137

Model 2520 Pulsed Laser Diode Test System Service Manual Performance Verification 1-5
Recommended test equipment
Table 1-1 summarizes recommended verification equipment and pertinent specifications.
You can use alternate equipment as long as that equipment has specifications at least as
good as those listed in
Table 1-1 . Keep in mind, however, that test equipment uncertainty
will add to the uncertainty of each measurement. Generally, test equipment uncertainty
should be at least four times better than corresponding Model 2520 specifications.
Table 1-1
Recommended verification equipment
Description Manufacturer/Model Specifications
Calibrator Fluke 5700A
1
DC Voltage: 5V:
10V:
±5ppm
±5ppm
Digital
Multimeter
Keithley 2001
2
DC Voltage:
Resistance:
20V:
20
Ω
200
Ω
2k
Ω
±22ppm
±59ppm
±43ppm
±37ppm
Precision
Resistors
3
1.2 to 1.6
Ω
, 5W, ±5%
4
10 to 15
Ω
, 5W, ±5%
4
200
Ω
, 2W, ±1%
400
Ω
, 1W, ±1%
1k
Ω
, 0.5W, ±1%
2k
Ω
, 0.25W, ±1%
Temperature
coefficient =
20ppm/°C for
all resistors
1. 90-day accuracy specifications of lowest usable range for specified output.
2. 90-day full-range accuracy specifications.
3. Characterize resistors to within ±100ppm using 4-wire ohms function of digital multimeter before use.
4. Use RN60 type:
20 300
Ω
in parallel
10 16
Ω
in parallel
1-10 2k
Ω
in parallel
Resistor characterization
The precision resistors listed in Table 1-1 should be characterized to within ±100ppm
using the 4-wire ohms function of the digital multimeter before use. Use the characterized
values when performing the verification procedure.