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Calibration - Procedures: mA input
1. Connect the instrument to the calibration equipment
(Figure 3).
2. Let the equipment get to a stable temperature
(minimum: 5 minutes since the last power on).
3. Use the calibration menu (Table 9) to do a three-point
calibration (-FS, Zero and +FS). The display shows the
applicable instructions to complete the calibration.
4. To make sure that the calibration is correct, select the
applicable mA input task (Table 2) and apply these
values:
• mA: -55, -40, -24, -18, -12, -6, 0 (short circuit)
Then mA: 0, 6, 12, 18, 24, 40, 55.
5. Make sure that the error is in the specified limits
(Table 10).
Table 10: mA input error limits
Applied
Calibrator
Permitted
mA
error
DPI 880 error
(mA)
(mA)
±55
0.0022
0.005
±40
0.0018
0.004
±24
0.0014
0.003
±18
0.0004
0.003
±12
0.0003
0.002
±6
0.0002
0.002
0 (Short circuit)
-
0.001
Calibration - Procedures: mA output
1. Connect the instrument to the calibration equipment
(Figure 1).
2. Let the equipment get to a stable temperature
(minimum: 5 minutes since the last power on).
3. Use the calibration menu (Table 9) to do a two-point
calibration (Zero and +FS). The display shows the
applicable instructions to complete the calibration.
4. To make sure that the calibration is correct, select the
applicable mA output task (Table 2) and set these
output values:
• mA: 0 (short circuit), 4, 12, 20, 24
5. Make sure that the error is in the specified limits
(Table 11).
Table 11: mA output error limits
Output
Calibrator
Permitted
mA
error
DPI 880 error
(mA)
(mA)
0 (Short circuit)
-
0.001
4
0.00020
0.001
12
0.0014
0.001
20
0.002
0.002
24
0.0023
0.002
Calibration - Procedures: mV/Volts input
1. Connect the instrument to the calibration equipment
(Figure 4).
2. Let the equipment get to a stable temperature
(minimum: 5 minutes since the last power on).
3. Use the calibration menu (Table 9) to do a three-point
calibration (-FS, Zero and +FS). The display shows the
applicable instructions to complete the calibration.
4. To make sure that the calibration is correct, select the
applicable mV or Volts input task (Table 2).
5. Then apply the input values that are applicable to the
calibration:
• mV: -120, -60, -30, 0 (short circuit)
Then mV: 0, 30, 60, 120
OR
• Volts (V): -30, -15, -5, 0 (short circuit)
Then volts (V): 0, 5, 15, 30
6. Make sure that the error is in the specified limits
(Table 12 or Table 13).
Table 12: mV input error limits
Applied
Calibrator
Permitted
mV
error
DPI 880 error
(mV)
(mV)
±120
0.0013
0.03
±60
0.0008
0.02
±30
0.0006
0.02
0 (Short circuit)
-
0.01
Table 13: Volts (V) input error limits
Applied
Calibrator
Permitted
V
error
DPI 880 error
(V)
(V)
±30
0.00058
0.004
±15
0.00011
0.002
±5
0.00006
0.001
0 (Short circuit)
-
0.001
Page 12
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