Measuring ac & dc volts, Measuring ac amps, Analog meter: reading the scale – Gardner Bender GCM-500 Clamp-On Multimeter User Manual
Page 4: 1 measuring resistance
6
Measuring AC & DC Volts
Note: Voltage measurements can only be made using the
test leads and not the clamp-around jaws.
Set the function/range dial to the appropriate AC or DC
voltage setting. Place the leads across the circuit under test
and read the middle scale on the analog display. For proper
voltage measurements multiply the reading on the scale by
the chart below.
Measuring AC Amps
Set the dial to the proper AMPS range and open the jaws.
Note that the jaws will only open when in the AMPS range.
Place the jaws around a single conductor, either the hot or
neutral wire, and read the measurement on the display. Note
that the jaws must not be clamped around two wires or a false
measurement will occur.
5
4) Never immerse the meter in water or solvents. To clean
the housing use a damp cloth with a minimal amount of
mild soap.
Analog Meter: Reading the Scale
LOCKjaw™: This special feature does not allow the jaws to
open when the dial is in the OHMS or Voltage settings.
The jaws are only used for taking amperage readings.
3.1 Measuring Resistance
Before making resistance or continuity tests, check the
condition of the internal battery. First turn the function/range
switch to the ohms position. Short the test leads together
and the needle indicator should deflect to the right side of
the scale. Keep the test leads shorted together while
simultaneously turning the zero ohms adjustment
dial until the needle indicator reads zero at the right side
of the scale. If the needle will not zero, replace the battery
with a new 1.5 volt AA size battery.
Ω
0
10
0
200
300
400
500
60
0
0
10
20
30
40
50
60
0
1
2
3
4
5
6
50
0
10
0
50
20
10
5
0
A
A
V
∞
V
1k
Resistance
(Ohms)
Scale
AC Current
Scale
CO
M
V
Ω
Ω
M
A
X
6
0
0V
6
0V
R
60
V
30
0V
60
0V
60
0A
60
A
6A
~
~
~
~
~
~
Ω
0
10
0
2
0
0
3
0
0
40
0
50
0
60
0
0
1
0
2
0
3
0
40
50
60
0
1
2
3
4
5
6
5
0
0
1
0
0
5
0
2
0
10
5
0
A
A
V
∞
V
Ω
1k
AC/DC
Voltage
Scale
Range
Multiple Reading
Setting
on Scale By
60V DC
10
60V AC
10
300V AC
50
600V AC
100
COM
V
Ω
Ω
MAX
600V
60V
R
60V
300V
600V
600A
60A
6A
~
~
~
~
~
~
Ω
0
10
0
200
300
400
500
60
0
0
10
20
30
40
50
60
0
1
2
3
4
5
6
50
0 1
00
50
20
10
5
0
A
A
V
∞
V
Ω
1k
R
ed Lead
B
la
ck
L
ea
d