4230 Flow Meter
Section 1 Introduction
1-11
Figure 1-3 Measuring Flow Meter Current
Note
Do not attempt this procedure unless you have the proper
equipment available and know how to make electrical mea-
surements.
To measure current for a varying load requires a more-sophisti-
cated type of multimeter, one that is capable of averaging high
and low readings over a period of time. The Fluke® 87 Multi-
meter is one example of this type of meter. You should set the
meter on MIN/MAX and let it run with your program for several
hours or more. Other manufacturers’ meters are also acceptable,
but only if they are capable of averaging current draw. You
should run the test for at least eight hours, longer if necessary, or
until the flow meter has exercised the entire program. The longer
you run the test, the more accurate the average will be.
More information about batteries used to power Isco equipment
is available from the Isco Power Products Guide, which is
shipped with this manual and any flow meter order.
Com
Battery, 12 Volt
–
+
Flow
Meter
mA
A
A
FLUKE 87 TRUE RMS MULTIMETER
00I5
mA µA
V Ω
Fluke
®
87
Connect Cable
60-1394-023,
(or other current-
averaging meter)
+ clip
+ lead
or you can make
A good quality, adjustable, regulated DC power supply
can be substituted for the 12-volt battery. The power
your own.
supply should have at least 3 Amperes output, prefer-
ably more, and capable of overcurrent surges.
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