Calibration Cycle; Recommended Calibration Equipment; Resistor Characterization - Keithley 2520 Service Manual

Model 2520 Pulsed Laser Diode Test System Service Manual

Calibration cycle

Perform calibration at least once a year to ensure the unit meets or exceeds its
specifications.

Recommended calibration equipment

Table 2-1
alternate equipment as long that equipment has specifications at least as good as those
listed in the table. For optimum calibration accuracy, test equipment specifications should
be at least four times better than corresponding Model 2520 specifications.
Table 2-1
Recommended calibration equipment
Description
Calibrator
Digital
Multimeter
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 only non-inductive metal film or bulk metal resistors.

Resistor characterization

The precision resistors listed in
using the 4-wire ohms function of the digital multimeter before use. Use the characterized
values when performing the calibration procedure.
lists the recommended equipment for the calibration procedures. You can use
Manufacturer/Model
1
Fluke 5700A
Keithley 2001
3
Table 2-1
Specifications
DC Voltage:
2
DC Voltage:
DC Current:
Resistance:
1.2 to 1.6Ω, 2W, ±5%
10 to 15Ω, 2W, ±5%
10Ω, 0.5W, ±1%
100Ω, 0.5W, ±1%
200Ω, 2W, ±1%
400Ω, 1W, ±1%
1kΩ, 0.5W, ±1%
2kΩ, 0.25W, ±1%
should be characterized to within ±100ppm
Calibration
5V: ±5ppm
10V: ±5ppm
20V: ±22ppm
2mA ±320ppm
20mA ±320ppm
200mA ±320ppm
20Ω ±59ppm
200Ω ±43ppm
2kΩ ±37ppm
Temperature
4
coefficient =
4
20ppm/°C for
all resistors.
2-5