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Calibration considerations
When performing the calibration procedures:
• Make sure that the test equipment is properly warmed up and connected to the
• Always allow the source signal to settle before calibrating each point.
• Do not connect test equipment to the Model 2306 through a scanner or other switching
• Calibration must be performed in the sequence outlined in this manual or an error will
• Both channels are calibrated during calibration.
• If an error occurs during calibration, the Model 2306 will generate an appropriate error
WARNING
Calibration cycle
Perform calibration at least once every two years to ensure the unit meets or exceeds its
specifications.
Recommended calibration equipment
Table 14-1
alternate equipment as long as that equipment has specifications at least four times better than
corresponding Model 2306 specifications. See also
section for important temperature coefficient information.
Table 14-1
Recommended calibration equipment
Description
Digital Multimeter
Precision Resistor
Precision Resistor
1
Full-range, 90-day, 23°C ±5°C accuracy specifications of ranges required for various measurement points.
2
Characterize resistor using 4-wire ohms function of DMM before use.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
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appropriate Model 2306 OUTPUT #1 or OUTPUT #2 terminals, depending on which
channel you are calibrating.
equipment.
occur.
message. See Appendix C for more information.
The maximum common-mode voltage (voltage between LO and chassis
ground) is 22VDC. Exceeding this value may cause a breakdown in insulation,
creating a shock hazard.
lists the recommended equipment for the calibration procedures. You can use
Manufacturer/Model
Keithley 2001
"Resistor considerations"
Specifications
1
DC Voltage
20V: ±22ppm
1
Resistance
20Ω: ±59ppm
20kΩ: ±36ppm
2
4Ω, 0.1%, 100W
2
3kΩ, 0.1%, 0.125W
Calibration
14-3
later in this
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