App-3
IM 2560A-01EN
Appendix
3
2
1
4
5
6
7
8
9
10
11
12
13
14
15
16
App
Index
Deviation
The deviation dials are used to move the meter needle that has been forced to point to a position short
of the accurate position with the preset feature (see the previous page) to the accurate scale position.
The value shown on the deviation display when the needle is pointing to the accurate position is the
calibration deviation. For details on 2560A configuration, see chapter 5 or section 7.2.
Ammeter
4.5 A → 5 A
Main setting (MAX) = 10 A
Main setting (MIN) = 0 A
Use the deviation dial to align the meter
needle to the accurate scale position.
Example: 4.5 A → 5 A
The deviation is –0.03%.
Calibrating a 4-20 mA Meter
To calibrate at 4 mA, 8 mA, 12 mA, 16 mA, and 20 mA, use the SCALE switch and main setting dials
to set the scale’s main setting (MAX) to 20 mA and main setting (MIN) to 4 mA. Set the output divider’s
denominator m to 4. Vary the numerator n from 0 to 4, and for each setting turn the deviation dials to
align the meter needle. For details on 2560A configuration, see chapter 5 and sections 7.1 and 7.2.
4
8
12
16
20
n=0
m=4
n=4
m=4
n=1
m=4
n=2
m=4
n=3
m=4
Main setting (MAX) = 20 mA
Main setting (MIN) = 4 mA
Scale setting
Output divider
Appendix 2 Example of Meter and Transducer Calibration
