24 V Source Test; 4-20 Ma Accuracy Alignment - Fluke 9190A Operator's Manual

9190A
Operators Manual
9. Take mA measurements from the 4-20 mA input at a 2-second interval. Take a
10. Set the current source to supply 12 mA.
11. Let the readout stabilize for 20 seconds.
12. Take mA measurements from the UUT mA input at a 2-second interval. Take a
13. Set the current source to supply 20 mA
14. Let the readout stabilize for 20 seconds.
15. Take mA measurements from the UUT mA input at a 2-second interval. Take a
16. Set the current source to supply 22 mA
17. Let the readout stabilize for 20 seconds.
18. Take mA measurements from the UUT mA input at a 2-second interval. Take a
19. Calculate the average of the measurements taken. Record these results.
20. Calculate the error with the formula below. Record this result.
21. Compare the error with the spec to determine the status. Record the result.

24 V Source Test

The 24 V Source Test is used to collect As Found and As Left data.
All 24V Source Tests are to be performed in mA.
Perform the 24 V Source Test as follows:
1. Connect the current source to the 4-20 mA UUT input connector.
2. Set the 4-20mA input to take UUT measurements.
3. Set the mA input LOOP POWER setting to ENABLE.
4. Connect the 1200 Ω resistor to the voltage source.
5. Set the voltage source to supply 24 volts.
6. Let the readout stabilize for 30 seconds.
7. Take 40 voltage measurements from the UUT 4-20 mA input at a 2-second interval.
8. Calculate the average of the measurements taken. Record these results.
9. Compare the average with the specifications to determine the status. Record the

4-20 mA Accuracy Alignment

The 4-20 mA Accuracy Alignment process calculates new offsets to be programmed into
the instrument for the UUT 4-20mA input to correct for measured errors at specific points
over the current range of the input.
Perform the 4-20 mA Accuracy Alignment as follows:
4-24
minimum of 40 samples.
minimum of 40 samples.
minimum of 40 samples.
minimum of 40 samples.
Error = Average – Nominal
result. Expected voltage is 18.00 V, with a specification of +/-1.8 V.
Note