14-4 Calibration
Resistor connections
When performing calibration steps that use either the 4Ω or 3kΩ resistor, connect the
Model 2306 OUTPUT #1 or OUTPUT #2 SENSE leads and DMM test leads as close to the
resistor body
as possible.
Resistor considerations
The test resistors should be characterized using the 4-wire ohms function of the DMM
recommended in Table 14-1 to measure the resistance values. Use the measured resistance
values to calculate the actual currents during the calibration procedures.
NOTE The temperature coefficient and temperature change of the 4Ω
resistor when passing
current at full load must be low enough so that the change in resistance does not cause
incorrect readings. This is summarized in the following equation:
V
OUT
RRΔ+()
----------------------
25% of Model 2306 amps specification<
where: V
OUT
is the Model 2306 output voltage
R is the characterized value of the resistor
ΔR is the change
in resistance caused by heating
Front panel calibration
Use the following procedure to calibrate the Model 2306 from the front panel. Table 14-2
summarizes calibration steps.
NOTE Calibration must be performed in the following seque
nce, or an error will occur. To
abort calibration and revert to previous calibration constants at any time during the
procedure, press the MENU key. Follow message prompts to abort calibration. Use
â–² and â–¼ keys to select desired response.
Step 1: Prepare the Model 2306 for calibration
1. Turn on the Model 2306 and the digital multimeter, and allow them to warm up for at
least one hour before performing calibration.
2. Press the MENU key, then choose CALIBRATE UNIT, and press ENTER. The
instrument will
display the date last calibrated:
CALIBRATE UNIT
LAST ON 02/01/2003
3. Press the
â–² key. The instrument will display the number of times it was calibrated:
CALIBRATE UNIT
TIMES = 1
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
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