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10

9

Use the chart below as a guide to reading DC 
voltage measurements:

DC V        Read              

range      following

setting        scale

10             0-10

50             0-50

150           0-150          
300           0-300

4.1 Household Batteries

Set the function/range switch to 10V DC to
test household 1.5 volt through 9 volt batteries.
Touch the red (+) test lead to the (+) terminal
and the black (-) test lead to the (-) terminal
of the battery. Read the 0-10 scale to 
determine the condition of the battery.

5. DC Milliamp 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 DCmA setting.

3) Touch the test leads to the circuit in series (in

line with the circuit) so that the circuit current
passes through the multimeter in order to
make the measurement. If the needle indicator
deflects to the left, reverse the test leads.

DC mA

Read        and

range      following

multiply

setting        scale

reading by:

0.5            0-50         0.01
50             0-50

1

150           0-150      

1

Common DC Milliamperage

Measurements

It is important to point out that milliamps can
also be expressed as thousandths of an
Ampere; therefore 150 milliamps is 150 
thousandths of one Amp. The 150mA function
of your multimeter is commonly used by 
electronics repair technicians and hobbyists to
troubleshoot various low voltage circuits.
Although not normally used for electrical 
troubleshooting around the home, this function
can be used to measure the milliamperage
draw of household items such as flashlights,
and other battery operated devices that do not
draw more than 150 mA. In fig. 2 the red (+)
test lead is hooked up to the (+) terminal of the
lantern battery while the black (-) test lead is
hooked up to the bulb. The meter will indicate
the milliamperage draw when the flashlight
switch is thrown in the ON position.

Do not apply voltage to the

test leads while the meter is set in the 

milliamp range. See #8 

For Your Safety.

6. AC 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 

Figure 2

!

WARNING

HSP5 3-09 manual.qxp  5/8/09  9:57 AM  Page 10

Summary of Contents for GMT-312

Page 1: ...ual Read this owners manual thoroughly before use and save HSP5 HSP5 3 09 manual qxp 5 8 09 9 57 AM Page 1 99 Washington Street Melrose MA 02176 Phone 781 665 1400 Toll Free 1 800 517 8431 Visit us at...

Page 2: ...or the homeowner hobbyist and professional needing to make electrical and electronic equipment measurements 1 1 Meter Functions Needle Analog Scale Mechanical Zero Adjust Screw Zero Ohms Adjust ment I...

Page 3: ...m max Decibels 20dB to 56dB on AC voltage ranges Accuracy DC voltage mA 4 full scale of range AC voltage 5 full scale of range Resistance 4 arc of scale length Sensitivity 2000 ohms per volt DC and AC...

Page 4: ...et the function range switch to WARNING WARNING 6 5 the appropriate setting for greater accuracy 2 Avoid placing the meter in areas where vibration dust or dirt are present Do not store the meter in e...

Page 5: ...n 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...

Page 6: ...1 Common DC Milliamperage Measurements It is important to point out that milliamps can also be expressed as thousandths of an Ampere therefore 150 milliamps is 150 thousandths of one Amp The 150mA fun...

Page 7: ...nce and continuity testing POWER MUST BE OFF 1 Fully seat the test leads in the input jacks black lead red lead 2 Set the function range switch to the Rx1K position resistance indicated multiplied by...

Page 8: ...fuse is good the needle indicator will move to 0 ohms If not replace the fuse On plug type fuses touch the the test leads on the bottom contact and the other on the threaded metal contact see fig 6 7...

Page 9: ...uses GB model GF 0306 4 Carefully replace the back cover and tighten the screw Do not overtighten as this may strip the threads in the meter housing 10 Warranty 1 YEAR WARRANTY limited solely to repai...

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