EVOM
Features and Controls
(1)
Power Switch On/Off:
turns the
meter on and off.
(2)
Mode Switch R/V:
When in
the R position, the meter is in the
resistance-measuring mode. When
in the V position, the meter is in the
voltage-measuring mode.
(3)
Range Toggle Switch
2000
Ω
/20K:
This switch only
functions when the meter is in R
mode. At the 2000
Ω
position, the full
scale is 2000
Ω
. At the 20K position,
the full scale is 20 K
Ω
.
(4)
Test R Pushbutton:
Pressing
this pushbutton when the meter
is in the R mode will connect the
circuit to an internal 1000
Ω
standard
resistor whose resistance will then
be measured. If the display shows a
value close to 1000
Ω
(± 1%), then
the meter’s resistance measurement
function is performing acceptably.
During the test, the external electrode
is disconnected from the meter by
the switch. Therefore, the electrode
does not need to be connected to
the meter during the test. In model
EVOMX
, the Measure R pushbutton (see below) has
been replaced by a toggle switch. The toggle switch must be in the off position when this
test is performed.
(5)
Measure R Pushbutton (EVOM):
When the meter is in the R mode, pressing
this button causes the resistance across the two electrode probes to be measured. The
resistance measuring circuit will function only when this switch is depressed; it will
shut off when the switch is released.
Do not press this button without the electrode
immersed in solution, otherwise the circuit will overload and a warning tone will
sound.
WORLD PRECISION INSTRUMENTS 3
1
2
8
6
5
9
4
3
7
EVOM
