Section 3: Calibration
Model 2461 Calibration and Adjustment Manual
3-8
2461-905-01 Rev. A / February 2016
When verifying the 4 A to 10 A ranges using a shunt resistor, use the following formula to calculate
the current:
Current (I) = Voltage (V) / Resistance (R)
Where:
Resistance is either the value stated by the specifications for the shunt resistor, or for greater
measurement accuracy, resistance is the measured resistance value of the shunt resistor.
1. With the source output off, connect the Model 2461 to the DMM using the connection
configuration in
Connections for the 4 A to 10 A ranges
(on page 2-5).
Hazardous voltages may be present on all output and guard terminals. To prevent electrical
shock that could cause injury or death, never make or break connections to the Model 2461
while the instrument is powered on. Turn off the equipment from the front panel or
disconnect the main power cord from the rear of the Model 2461 before handling cables.
Putting the equipment into standby does not guarantee that the outputs are powered off if a
hardware or software fault occurs.
2. Turn on the Model 2461 source output.
If the Model 2461 is not already warmed up, allow it to warm up for at least one hour before
continuing to the next step.
3. Complete the calibration verification steps listed in the following table for each current range. For
each current range, perform the complete procedure at 95 percent of the range's positive
full-scale value, then at 0 A, then at 95 percent of the range's negative full scale value, and then
again at 0 A. For example, for the 5 A range, complete the procedure four times using each of the
following values, in this order: +4.75 A, 0 A, -4.75 A, 0 A.
Although the Model 2461 will accept commands in the following procedure to set the 10 A source-
measure-digitize range, the Model 2461 output current is limited to 7 A for DC operation. Because of
this limit, use ±7 A (instead of ±9.5 A) as the full-scale source output when verifying the 10 A range.
