Insulation Meter Cross Reference
IDEAS FOR THE FUTURE
Switch contacts get dirty and one way of making sure dirty contacts don’t
cause a problem is to solder the switch contacts. Of course, this will dedicate
the meter and prevent it from ever being used for anything else.
Replacing the internal batteries when the case is taped together can be a real
pain. One idea is to remove the battery and replace it with a soldered-in
jumper. Then, there is no internal battery to replace.
For those who have real energy, the meter can be backwards engineered and
the internal resistors recalculated so the meter can be used on all scales
(RX1, RX10, RX100). The resistance scale on the face of the meter will still be
off so a cross reference table will be needed, but the meter will be a little
4. 7 kOhms
■ FIGURE 9.
small enough to fit on the back of the meter, so I just used
copious amounts of electrical tape to attach the assembly
to the back of the meter.
need to be
they do not
This assembly of the batteries and pigtail can be put
in a plastic chassis box and then attached to the meter.
Personally, I never found a commercial box that was both
big enough to house the whole battery assembly and
Barely moves the
Ohmmeters use Ohm’s Law (Resistance = Voltage ÷
Amperage) to figure out the resistance of the device being
measured. The voltage is provided by the meter’s internal
battery and remains relatively constant. The amperage is
the current through the device being tested; in this case,
insulation on wire.
On an analog meter (a meter that has a mechanical
meter movement), the needle actually shows the amount
of current through the device. It moves to the right as the
resistance goes down and the current goes up. When the
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