2. Meter Safety
Never change the range
setting with the meter
connected to a live
circuit.
Always select a higher
range than you expect to
measure, if you are
unsure select the highest
range.
The most accurate
readings are taken with
the range set for a
reading near center scale
when using analog meter
3. Meter Safety
Never hold the meter in
your hand when taking a
reading under power.
For current readings
above 250mA use a
clamp-on meter.
Always wear you personal
safety protective
equipment.
For low voltage that
means safety glass are
the minimum
4. 240 Volts maximum
regardless of the range
Add to zeros to the 10V
scale for the 1000V range
Example: a reading of 2.4
on the 10V scale is 240V
with range switch on the
1000V range
5. Observe polarity when
taking DC readings with
an analog meter.
Red is + and Black is -
Remember to add the
decimal point to the 250V
scale when using the 25V
range
Example: a reading of
100V on the 250V scale is
only 10V when the range
switch is set for 25V
6. Make sure the power is off
before measuring resistance
Make sure the item under
test is isolated from the
circuit
Always zero the meter
before taking an ohm
reading by shorting the
probes and adjusting the
Ω adjust knob until the meter
reads zero on the ohms
scale.
11. Example of a typical
analog camp-on ammeter
Proper use requires
clamping around only one
current carrying conductor
at a time
Not designed for high
voltage (over 600V)
applications
12. Looping the conductor will
increase the reading by
100% for each loop.
Looping allows for reading
low values. Just remember
to divide the reading by the
number of loops.
Example: 10 loops with a
reading of 12 A is actually
1.2 A
Editor's Notes
This will damage the switch by pitting due to arcing.
This will damage the switch by pitting due to arcing.
Never exceed 240V because the fuse is only rated for 240V, under a fault condition the meter could explode in your hand. On the 250V scale each line is 5V on the 10V scale each line is 2V The meter when set to read voltage has a high value of resistance so as not to upset the circuit under test (10k ohms per volt on AC)
Observe polarity when taking DC readings the meter needle will go down scale and can be damaged. Remember to add the decimal point to the 250V scale when using the 25 V range range On the 50V scale each line is 1 volt
Note how the Ohm’s scale is non-linear as compared to the other scales Also note that the Ohm’s scale is right to left because the battery in the meter supplies power and shorting the probes causes full scale deflection at 0 ohms Always remember to zero the meter before taking any ohm reading On this type meter the leads are often reverse polarity using the ohm’s ranges (the black probe is +)
If you leave the meter on a current scale an then try to read voltage the meter becomes a short circuit and will damage itself or the circuit under test (for current ranges the meter has low resistance so as not to upset the readings)
For the 2.5 V range use the 250 scale and remember to add the decimal point For the Ohm’s range remember to add the zero’s. Note the ohm’s scale is on top on this meter
For the 2.5 V range use the 250 scale and remember to add the decimal point For the Ohm’s range remember to add the zero’s. Note the ohm’s scale is on top on this meter
For the 2.5 V range use the 250 scale and remember to add the decimal point For the Ohm’s range remember to add the zero’s. Note the ohm’s scale is on top on this meter
