Gardner Bender GMT-312 5 Function Analog Multimeter - Manual (Page 5)

adjustment screw clockwise or counterclock-
wise until the needle indicator is directly over
the three black zeros at the left end of the scale.
Analog Meter: Reading the Scale
General
The first step in reading the analog scale is to
align the needle with the scale.
Resistance (Ohms - Ω)
Use the top scale for reading the resistance.
If the meter is set to X1k, multiply the
resistance value by 1000Ω.
DC Voltage (V DC)
Use the middle scale. Match the dial setting to
the highest number on the scale.
AC Voltage (V AC)
Use the same numbers and procedures as
used for the DC voltage setting, but use the
scale directly below the numbers.
DC Milliamps
Use the same scale and procedure as used
for the DC voltage setting.
DC
1
2
5
10
20
40
100
200
1K
8
20
} 30
60 90
120
150
60
120 180
240
300 0
5 4
8 7
Decibel Gain (dB) - see pg. 15
Use the scale marked dB to read decibels for
transistor gain. Use the chart at the right of
the scale for proper conversion.
3.2 Internal Battery Condition
Before making resistance or continuity tests,
check the condition of the internal battery. First
turn the function/range switch to the ohms
Rx1K 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
ohms (green) scale. If the needle will not zero,
replace the battery with a new 1.5 volt AA size
non-rechargeable battery (see
Battery
Replacement).
4. DC Voltage Measurement
1) Fully seat the test leads in the correct input
jacks, (-) black lead, (+) red lead.
2) Set the function/range switch to the
appropriate DC voltage range. If the voltage
is unknown, use the highest range. If the
voltage applied falls within the range of a
lower setting, reset the function/range switch
to the appropriate setting for greater accuracy.
3) If the polarity of the circuit to be tested is
known, touch the black test lead to the
neutral side. If the polarity is unknown, touch
the test leads to opposite sides of the circuit.
If the needle indicator deflects to the left of
the scale, reverse the test leads.
Resistance
(Ohms)
Scale
DC Voltage
& Milliamps
Scale
Common Markings
for both the AC & DC
Voltage Scales
AC Voltage Scale
dB Scale for Transistor
Gain Measurement
GMT-312 5-09 manual.qxp 5/21/09 3:04 PM Page 8