Calibration 14-3
Calibration considerations
When performing the calibration procedures:
• Make sure that the test equipment is properly warmed up and connected to the
appropriate
Model 2306 OUTPUT #1 or OUTPUT #2 terminals, depending on which
channel you are calibrating.
• 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
equipme
nt.
• Calibration must be performed in the sequence outlined in
this manual or an error will
occur.
• Both channels are calibrated during calibration.
• If an error occurs during calibration, the Model 2306 will generate an appropriate error
messag
e. See Appendix C for more information.
WARNING The maximum common-mode voltage (voltage between LO and chassis
ground) is 22V
DC. Exceeding this value may cause a breakdown in insulation,
creating a shock hazard.
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 lists the recommended equipment for the calibration procedures. You can use
alternate equipment as long as that equipment has specifications at least four times better than
correspon
ding Model 2306 specifications. See also “Resistor considerations” later in this
section for important temperature coefficient information.
Table 14-1
Recommended calibration equipment
Description Manufacturer/Model Specifications
Digital Multimeter Keithley 2001 DC Voltage
1
20V: ±22ppm
Resistance
1
20Ω: ±59ppm
20kΩ: ±
36ppm
Precision Resistor 4Ω, 0.1%,
100W
2
Precision Resistor 3kΩ, 0.1%, 0.125W
2
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
TestEquipmentDepot.com
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