(a)
Multimeter Technique 1) The multimeter technique uses the alternating current motor pumps (ACMP) to measure the hydraulic flow rate.
2) A multimeter connects to a clamp-on ac current probe which you put around one of the three wires which connect to the load side of the ACMP ELCU in the P31 or P32 panel. The multimeter with the ac current probe measures the amperage which flows in the one wire to the pump motor. A graph shown in Fig. 605 changes the amperage to a hydraulic flow rate.
(b)
Flowmeter Technique
1) The flowmeter technique uses a flowmeter to measure flow rates directly while the system is pressurized with an ACMP or a hydraulic service cart. You install the flowmeter in the pressure line between the pressure source and the pressure filter module.
(6) The procedure for the PCA leakage check follows. This procedure is the same for all three systems, but the specified leakage limits are different. The sequence in which you do a test of the left, right, and center systems is not important.
B. Equipment
(1) Use this equipment with multimeter technique:
(a) Digital Multimeter - John Fluke Model 27 YEL.
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Figure 604
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152025303540 45
CURRENT IN AMPS FOR ONE PHASE
(ABEX PUMPS)
ACMP Flow and Multimeter Value
Figure 605 (Sheet 1)
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