Heating Elements; Thermostats; Decibel Measurement; Battery And Fuse Replacement - Gardner Bender GMT-12A Manual Del Propietário

7.5 Heating Elements

Household appliances such as coffee makers and water
heaters contain heating elements which may require
troubleshooting. When making continuity checks on heating
elements, disconnect the element(s) from the circuit(s) that
supply it/them. Touch the test leads, one on each end of
the element and observe the needle indicator. The reading
should indicate low ohms. If the needle indicator doesn't
move, the heating element is broken. If the element(s)
show that continuity exists, test for continuity of the
circuit(s) that feed the element(s).

7.6 Thermostats

Make sure the thermostat control is in the OFF position.
Remove the thermostat cover. Touch the test leads to the
contact points on the thermostat. The needle indicator
should move to read -0- ohms. If not, either one of them
may be loose or broken.

8. Decibel Measurement

The decibel feature of this multimeter is for transistor gain
measurement in electronic circuits and should not be
confused with audio decibels. This function is used
primarily by electronics technicians to measure the power
gain in transistors, and is rarely encountered in home
project applications.
1) Fully seat the test leads in the correct input jacks.
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).
15

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 GB catalog number GF-0306 0.5A/250V
replacement fuses.
4) Carefully replace the back cover and tighten the screw.
Do not overtighten, as this may strip the threads in the
meter housing.
Order Form
Learn more about using multimeters with "How To Use
Your Multitester For Electrical Testing and Troubleshooting".
A 160 page guide to using analog and digital multimeters.
Only available in English. Contains nine chapters of easy to
understand instructions on basic household, automotive
electrical and electronic circuit testing. Packed with
illustrations. Paperback bound. Available wherever
multimeters are sold or:
For customers within the US, send check or money order for
$15.23 per copy ($13.23 plus $2.00 per copy shipping and
handling) to:
Gardner Bender
6101 N. Baker Rd.
Milwaukee, WI 53209
PLEASE PRINT CLEARLY
Name_________________________________________ _________
Address______________________________________ __________
City______________________State__________ Zip_____________
Qty. Ordered___ __________________
16