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1) Fully seat the test leads in the correct input

jacks, (-) black lead, (+) red lead.

2) Set the function/range switch to any one of

the AC voltage ranges and read the decibel
measurement on the bottom (red) scale of
the faceplate. Based on the AC voltage range
you selected, you will need to compute the
actual measurement by using the decibel
conversion chart located at the bottom right
of the faceplate.

Important: For absolute decibel measurements,
circuit impedance must be at least 600 ohms. -0-
decibels = 1 milliwatt in a 600 ohm impedance
(equivalent to 0.775 volts across 600 ohms).

9. Battery and Fuse Replacement

1) Remove the screw in the back cover of the

meter and carefully separate the back cover
from the front.

2) Note the polarity of the battery when 

removing it from its compartment and replace.

3) Use F200mA 250V replacement fuses, 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 repair
or replacement; no warranty of 
merchantability or fitness for a particular
purpose. Product is warrantied to be free
of defects in materials and workmanship
for the normal life of the product. In no
event shall Gardner Bender be liable for
incidental or consequential damage.

11. Correct Disposal of this product

This marking indicates that this 
product should not be disposed with
other household wastes throughout
the EU. To prevent possible harm to
the environment or human health

from uncontrolled waste disposal, recycle it
responsibly to promote the sustainable reuse
of material resources. To return your used
device, please use the return and collection
systems or contact the retailer where the 
product was purchased. They can take this
product for environmental safe recycling.

HSP5 3-09 manual.qxp  5/8/09  9:57 AM  Page 16

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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