2-9
IM 2560A-01EN
Features
3
2
1
4
5
6
7
8
9
10
11
12
13
14
15
16
App
Index
2.6 Deviation and Presets
Deviation output is a feature that adds or subtracts deviation from the voltage, current, resistance, or
temperature set with the main setting dials and outputs the result. Deviation cannot be used in high
resolution mode.
Deviation
This feature is used to check the relative error (deviation) of the meter scale calibration. If the meter
needle is not pointing accurately to the appropriate scale mark, you can turn a deviation dial on the
front panel to finely adjust the voltage, current, resistance, or temperature level so that the needle
points accurately to the mark. The amount of fine adjustment is displayed as the deviation.
Setup example: Main setting (MAX) = 10 A, main setting (MIN) = 0 A, divider value n/m = 1
Set deviation in the range of –20.00% to +20.00% by assuming (MAX – MIN) to be 100%. However,
a deviation that would cause the output value to fall outside the source range of each range is not
allowed.
Ammeter
9.97 A
Ammeter
10 A
Error (deviation)
Use the deviation dial to align the meter
needle to the accurate scale position.
The deviation is –0.30%.
In the example above, before fine adjustment, the meter needle is pointing to 9.97 A, which is 0.30%
smaller than the 10 A current output from the 2560A. The deviation polarity (the sign) of the 2560A
indicates whether the target device indication is larger or smaller than the accurate position. In this
example, because the meter is pointing to a value that is 0.30% smaller than the 2560A output value,
the 2560A displays –0.30%.
Deviation at Each Calibration Point
When the deviation feature is used in conjunction with the output divider feature explained in section
2.5, you can check at each calibration point the deviation in reference to the maximum scale value.
For example, when the maximum scale value is 10 A, 1% is 0.1 A. If you are using the output
divider feature at n = 2 and m = 10, when 2 A is being output, 1% will also be 0.1 A.
