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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
equipment.
•
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
message. See Appendix C for more information.
WARNING
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.
Calibration cycle
Perform calibration at least once every two years to ensure the unit meets or exceeds its
specifications.
Recommended calibration equipment
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
corresponding Model 2306 specifications. See also
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
20
Ω
: ±59ppm
20k
Ω
: ±36ppm
Precision Resistor
4
Ω
, 0.1%, 100W
2
Precision Resistor
3k
Ω
, 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
Содержание 2302
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