Fluke ProcessMeter 789 Calibration Manual

789/787B
Calibration Manual
14
Loop Power Test (789 only)
1. Enable the dc volts autorange function of the multimeter.
2. Turn the rotary knob of the UUT to LOOP POWER.
3. Measure the open circuit voltage of the UUT and verify it is >29.2 V and <32 V.
4. Press J (BLUE) on the UUT to enable the 250 Ω HART resistor.
5. Repeat step 3.
6. Disable the 250 Ω HART resistor by pressing J (BLUE).
7. Connect the 1-kΩ shunt across SOURCE + and SOURCE - of the UUT.
8. Measure the loaded down voltage and verify it is >23.8 V and <32 V, see Figure 2.
9. Remove the 1-kΩ shunt.
10. Disconnect the UUT from the multimeter and turn the UUT off.
11. Select the dc current function on the multimeter and set it to the 1-amp range (a 0.1
Ω shunt is used in the 1-amp range).
12. Connect the current input terminals of the multimeter to the SOURCE + and
SOURCE - terminals of the UUT.
13. Turn the rotary knob of the UUT to LOOP POWER.
14. Verify the short circuit current is >24 mA and <35 mA.
0%
RANGE HOLD
REL
MIN MAX
Hz
100%
789
PROCESSMETER
UUT
adm006F.EPS
Figure 2. Verifying Loop Power

Fluke ProcessMeter 789 Specifications

General

Diode test	Yes
Frequency range	0 - 19.999 kHz
AC current range	0 - 1 A
AC voltage range	0 - 1000 V
Resistance range	0 - 40000000 Ω
Resolution (AC voltage)	0.1 mV
Dimensions (WxDxH)	100 x 203 x 50 mm

Weight and Dimensions

Weight	610 g