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70 mA Tester
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The 70mA Tester for DC Amp Clips is a battery powered 70 mA
regulated current source designed to verify that the meter is functioning properly.
The clip
to be tested is easily clamped around the wire loop. A LED is
included to show that the battery is providing current. Be sure to
remove the plastic covering the switch before using.
Before
testing, zero the meter using the zero knob. Put the clip around the
wire loop. With the switch depressed, the LED should be on, showing
the battery is good. The current is generated as long as the switch
is depressed. The direction of current flow is indicated by an arrow
on the case. With the arrow engraved on the clip pointing in the
same direction as the arrow on the case, the meter reads positive 70
mA ± 2 mA.
On the
other hand, with the clip turned over so that its arrow points
opposite to that on the case, the reading on the Swain Meter™ should
be negative 70 mA ± 3 mA. To be accurate, the wire must not be near
the lips or jaws of the clip.
If the
Swain Meter™ does not show 70 mA ± 2 mA, it is not showing the proper
current and may need to be returned to the Swain Co. for repairs.
The 2
"AA" cells should last for at least 4 hours of constant usage, or
about 4 months, whichever comes first. It would be advisable to
change them at that time.
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Precision Instruments
Since 1965 |
