Internal Battery Condition; Dc Voltage Measurement - GB Intsruments GMT-319 Manual Del Propietário

GMT-319 manual 7.08.qxp
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
50
5K
100
2K 200
500
10K
1K
6
8
AC Voltage Scale
dB Scale for Transistor
Gain Measurement
General
The first step in reading the analog scale is to
align the needle with the scale. This is
achieved by locating the mirror on the scale.
Line the needle up with its reflection. When
the reflection is hidden by the needle, the
needle is properly aligned.
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 directly below the mirror.
Match the dial setting to the highest number on
the scale. If the setting does not match one of
the numbers, use a scale that can be easily
multiplied to give the setting (i.e. - for 1000V, use
the 10V scale and multiply the reading by 100).
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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.
Resistance
DC Milliamps
(Ohms)
20
Scale
Use the same scale and procedure as used
10
for the DC voltage setting.
Decibel Gain (dB)
DC Voltage
Use the scale marked dB to read decibels for
& Milliamps
transistor gain. Use the chart at the right of
Scale
the scale for proper conversion.
Common Markings
for both the AC & DC

3.2 Internal Battery Condition

Voltage Scales
Before making resistance or continuity tests,
check the condition of the internal battery. First
turn the function/range switch to a resistance
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 two new 1.5 volt AAA
size non-rechargeable batteries (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
- see pg. 15
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