Ohmite Resistors

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OHMITE L50J250KE Resistor Power 250K Ohm 250KOhm 250000 50W 5
OHMITE L50J250KE Resistor Power 250K Ohm 250KOhm 250000 50W 5
$29.95
quality
TCH35P22R0JE OHMITE 22 OHMS 35 WATTS Resistor in a TO 220 package 2 pieces
TCH35P22R0JE OHMITE 22 OHMS 35 WATTS Resistor in a TO 220 package 2 pieces
$7.75
quality
NEW OHMITE NO 0370 RESISTOR 210 25K 40 200 OHMS 25W
NEW OHMITE NO 0370 RESISTOR 210 25K 40 200 OHMS 25W
$5.00
quality
OHMITE 210 175P 46 RESISTOR 210175P46 NO 1159
OHMITE 210 175P 46 RESISTOR 210175P46 NO 1159
$28.95
quality
OHMITE 270 225P 46 RESISTOR 2 OHMS NO 0900D Y 49
OHMITE 270 225P 46 RESISTOR 2 OHMS NO 0900D Y 49
$10.00
quality
Ohmite Industrial Resistor 1156
Ohmite Industrial Resistor 1156
$16.15
quality
OHMITE 100 K OHM L50J100K RESISTOR
OHMITE 100 K OHM L50J100K RESISTOR
$17.50
quality
OHMITE 850F50R METAL MITE ALUM HOUSED RESISTOR 50W50
OHMITE 850F50R METAL MITE ALUM HOUSED RESISTOR 50W50
$7.00
quality
OHMITE 75 OHMS WIREWOUND RESISTOR L100J75R POWER 75OHM 100W 5 RESISTANCE NEW
OHMITE 75 OHMS WIREWOUND RESISTOR L100J75R POWER 75OHM 100W 5 RESISTANCE NEW
$7.31
quality
Vintage Ohmite 0773 50 Ohms 75 Watt Resistor  New A
Vintage Ohmite 0773 50 Ohms 75 Watt Resistor New A
$24.50
quality
OHMITE PFE5K8R50 POWER RIB RESISTOR 850 OHMS NIB SEALED
OHMITE PFE5K8R50 POWER RIB RESISTOR 850 OHMS NIB SEALED
$186.31
quality
NEW OHMITE 08X 2 72 G 46644 POWER RIB 21OHM RESISTOR D358677
NEW OHMITE 08X 2 72 G 46644 POWER RIB 21OHM RESISTOR D358677
$30.00
quality
OHMITE BROWN DEVIL RESISTOR VITREOUS ENAMELED 400 OHMS 12 W 5 12 WATTS NEW
OHMITE BROWN DEVIL RESISTOR VITREOUS ENAMELED 400 OHMS 12 W 5 12 WATTS NEW
$3.00
quality
OHMITE BROWN DEVIL VITREOUS ENAMELED RESISTOR 4000 OHMS 20W 4K OHMS 5 20 WATTS
OHMITE BROWN DEVIL VITREOUS ENAMELED RESISTOR 4000 OHMS 20W 4K OHMS 5 20 WATTS
$4.00
quality
OHMITE BROWN DEVIL VITREOUS ENAMELED RESISTOR 40K OHMS 12W 40000 OHMS 5 12 WATT
OHMITE BROWN DEVIL VITREOUS ENAMELED RESISTOR 40K OHMS 12W 40000 OHMS 5 12 WATT
$3.00
quality
OHMITE L12J180 VITREOUS ENAMELED WIREWOUND RESISTOR 180 OHMS 12 WATT 5 NEW
OHMITE L12J180 VITREOUS ENAMELED WIREWOUND RESISTOR 180 OHMS 12 WATT 5 NEW
$6.00
quality
OHMITE B5J3R0 VITREOUS ENAMELED WIREWOUND RESISTOR 5 WATT 3 OHMS 5 NEW
OHMITE B5J3R0 VITREOUS ENAMELED WIREWOUND RESISTOR 5 WATT 3 OHMS 5 NEW
$2.00
quality
OHMITE B8J700 VITREOUS ENAMELED WIREWOUND RESISTOR 700 OHMS 8 WATT 5 NEW
OHMITE B8J700 VITREOUS ENAMELED WIREWOUND RESISTOR 700 OHMS 8 WATT 5 NEW
$3.00
quality
OHMITE BROWN DEVIL RESISTOR VITREOUS ENAMELED 15K OHMS 20W 15000 OHMS 20 WATT 5
OHMITE BROWN DEVIL RESISTOR VITREOUS ENAMELED 15K OHMS 20W 15000 OHMS 20 WATT 5
$4.00
quality
OHMITE BROWN DEVIL RESISTOR VITREOUS ENAMELED 175K OHM 20W 5 17500 OHM 12 WATT
OHMITE BROWN DEVIL RESISTOR VITREOUS ENAMELED 175K OHM 20W 5 17500 OHM 12 WATT
$3.00
quality
OHMITE 3772 VITREOUS ENAMELED WIREWOUND RESISTOR W BRACKETS 12 W 56 OHMS 5 NEW
OHMITE 3772 VITREOUS ENAMELED WIREWOUND RESISTOR W BRACKETS 12 W 56 OHMS 5 NEW
$3.00
quality
OHMITE 3790 VITREOUS ENAMELED WIREWOUND RESISTOR W BRACKETS 330 OHMS 12 W 5 NEW
OHMITE 3790 VITREOUS ENAMELED WIREWOUND RESISTOR W BRACKETS 330 OHMS 12 W 5 NEW
$3.00
quality
OHMITE 45J22R SILICON CERAMIC WIREWOUND RESISTOR 22 OHMS 5 WATT 5 NEW
OHMITE 45J22R SILICON CERAMIC WIREWOUND RESISTOR 22 OHMS 5 WATT 5 NEW
$3.00
quality
OHMITE 45JR10 SILICON CERAMIC WIREWOUND RESISTOR 10 OHMS 5 WATT 5 NEW
OHMITE 45JR10 SILICON CERAMIC WIREWOUND RESISTOR 10 OHMS 5 WATT 5 NEW
$3.00
quality
OHMITE B5J2R7 VITREOUS ENAMELED WIREWOUND RESISTOR 5 WATT 27 OHMS 5 NEW
OHMITE B5J2R7 VITREOUS ENAMELED WIREWOUND RESISTOR 5 WATT 27 OHMS 5 NEW
$2.00
quality
OHMITE 1755 BROWN DEVIL RESISTOR VITREOUS ENAMELED 10K OHM 10000 OHM 5 12 WATT
OHMITE 1755 BROWN DEVIL RESISTOR VITREOUS ENAMELED 10K OHM 10000 OHM 5 12 WATT
$3.00
quality
OHMITE 2896 VITREOUS ENAMELED WIREWOUND RESISTOR 1200 OHMS 5 W 12K OHMS 5 NEW
OHMITE 2896 VITREOUS ENAMELED WIREWOUND RESISTOR 1200 OHMS 5 W 12K OHMS 5 NEW
$2.00
quality
OHMITE 3770 VITREOUS ENAMELED WIREWOUND RESISTOR W BRACKETS 12 W 47 OHMS 5 NEW
OHMITE 3770 VITREOUS ENAMELED WIREWOUND RESISTOR W BRACKETS 12 W 47 OHMS 5 NEW
$3.00
quality
OHMITE 1724 BROWN DEVIL RESISTOR VITREOUS ENAMELED 225 OHMS 12 W 5 12 WATTS NEW
OHMITE 1724 BROWN DEVIL RESISTOR VITREOUS ENAMELED 225 OHMS 12 W 5 12 WATTS NEW
$3.00
quality
NEW in the Box 25 OHMITE Wirewound 75 OHMS 5W Resistors D 97631 E D24
NEW in the Box 25 OHMITE Wirewound 75 OHMS 5W Resistors D 97631 E D24
$14.59
quality
Lot of 10 OHMITE Wirewound 75 OHMS 5W Resistors D 97631 E D24
Lot of 10 OHMITE Wirewound 75 OHMS 5W Resistors D 97631 E D24
$14.60
quality
OHMITE 1733 BROWN DEVIL RESISTOR VITREOUS ENAMELED 750 OHMS 12 W 5 12 WATTS NEW
OHMITE 1733 BROWN DEVIL RESISTOR VITREOUS ENAMELED 750 OHMS 12 W 5 12 WATTS NEW
$3.00
quality
OHMITE 1735 BROWN DEVIL RESISTOR VITREOUS ENAMELED 400 OHMS 12 W 5 12 WATTS NEW
OHMITE 1735 BROWN DEVIL RESISTOR VITREOUS ENAMELED 400 OHMS 12 W 5 12 WATTS NEW
$3.00
quality
OHMITE 0215 VITREOUS ENAMELED WIREWOUND RESISTOR W BRACKETS 10K OHMS 25W 5 NEW
OHMITE 0215 VITREOUS ENAMELED WIREWOUND RESISTOR W BRACKETS 10K OHMS 25W 5 NEW
$3.00
quality
OHMITE 0216 VITREOUS ENAMELED WIREWOUND RESISTOR W BRACKETS 12K OHMS NEW
OHMITE 0216 VITREOUS ENAMELED WIREWOUND RESISTOR W BRACKETS 12K OHMS NEW
$3.00
quality
OHMITE 1717 BROWN DEVIL RESISTOR VITREOUS ENAMELED 40 OHMS 12 W 5 12 WATTS NEW
OHMITE 1717 BROWN DEVIL RESISTOR VITREOUS ENAMELED 40 OHMS 12 W 5 12 WATTS NEW
$3.00
quality
OHMITE 1719 BROWN DEVIL RESISTOR VITREOUS ENAMELED 75 OHMS 12 W 5 12 WATTS NEW
OHMITE 1719 BROWN DEVIL RESISTOR VITREOUS ENAMELED 75 OHMS 12 W 5 12 WATTS NEW
$3.00
quality
OHMITE 1720 BROWN DEVIL RESISTOR VITREOUS ENAMELED 100 OHMS 12 W 5 12 WATTS NEW
OHMITE 1720 BROWN DEVIL RESISTOR VITREOUS ENAMELED 100 OHMS 12 W 5 12 WATTS NEW
$3.00
quality
OHMITE 0200E VITREOUS ENAMELED WIREWOUND RESISTOR W BRACKETS 75 OHMS 25 W 5 NEW
OHMITE 0200E VITREOUS ENAMELED WIREWOUND RESISTOR W BRACKETS 75 OHMS 25 W 5 NEW
$3.00
quality
5 pcs 23J50R OHMITE AXIAL WIREWOUND RESISTORS 50 Ohm 3W 5 VITREOUS ENAMEL
5 pcs 23J50R OHMITE AXIAL WIREWOUND RESISTORS 50 Ohm 3W 5 VITREOUS ENAMEL
$7.99
quality
ohmite WFH160L100JE 100 OHM 160WATT WIRE WOUND HEAT SINKABLE RESISTOR
ohmite WFH160L100JE 100 OHM 160WATT WIRE WOUND HEAT SINKABLE RESISTOR
$15.00
quality
B12J3R0 OHMITE AXIAL WIREWOUND RESISTORS 3 Ohm 12W 5 FREE SHIPPING
B12J3R0 OHMITE AXIAL WIREWOUND RESISTORS 3 Ohm 12W 5 FREE SHIPPING
$5.99
quality
NEW OHMITE DIVIDOHM  0379 RESISTOR 25 WATTS 3K OHMS
NEW OHMITE DIVIDOHM 0379 RESISTOR 25 WATTS 3K OHMS
$6.50
quality
OHMITE 546 BROWN DEVIL 6 K OHMS RESISTOR 8 W NNB
OHMITE 546 BROWN DEVIL 6 K OHMS RESISTOR 8 W NNB
$4.50
quality
OHMITE 1728 BROWN DEVIL 400 OHMS RESISTOR 12 W NNB
OHMITE 1728 BROWN DEVIL 400 OHMS RESISTOR 12 W NNB
$4.50
quality
OHMITE B12J 30 K OHMS 12 WATTS RESISTOR NNB
OHMITE B12J 30 K OHMS 12 WATTS RESISTOR NNB
$4.50
quality
OHMITE 2903 2400OHMS 5 WATT 24K WIREWOUND RESISTOR NNB
OHMITE 2903 2400OHMS 5 WATT 24K WIREWOUND RESISTOR NNB
$2.50
quality
OHMITE B8J500 500 OHMS 5 8 WATTS RESISTOR NNB
OHMITE B8J500 500 OHMS 5 8 WATTS RESISTOR NNB
$2.50
quality
OHMITE B8J4K0 4 K OHMS 5 8 WATTS RESISTOR NNB
OHMITE B8J4K0 4 K OHMS 5 8 WATTS RESISTOR NNB
$2.50
quality
OHMITE 1721 BROWN DEVIL 125 OHMS 5 RESISTOR 12 W NNB
OHMITE 1721 BROWN DEVIL 125 OHMS 5 RESISTOR 12 W NNB
$4.50
quality
OHMITE B12J 40 K OHMS 5 12 WATTS RESISTOR NNB
OHMITE B12J 40 K OHMS 5 12 WATTS RESISTOR NNB
$4.50
quality
OHMITE VITREOUS ENAMELED RESISTORS LUG RESISTOR L225J2R0 225 WATT S2 1 71D
OHMITE VITREOUS ENAMELED RESISTORS LUG RESISTOR L225J2R0 225 WATT S2 1 71D
$15.99
quality
OHMITE  0608 RESISTOR 750 OHMS 100 WATTS  270 100M 40
OHMITE 0608 RESISTOR 750 OHMS 100 WATTS 270 100M 40
$10.50
quality
LOT OF 3 OHMITE  90J4R0 RESISTORS 4 OHMS 11W9331
LOT OF 3 OHMITE 90J4R0 RESISTORS 4 OHMS 11W9331
$11.60
quality
LOT OF 4 OHMITE  B12J5R0 RESISTORS 5 OHMS 12 WATTS
LOT OF 4 OHMITE B12J5R0 RESISTORS 5 OHMS 12 WATTS
$6.50
quality
Ohmite 400 Ohm 10W Flame Retardant Wirewound Resistor FREE SHIPPING
Ohmite 400 Ohm 10W Flame Retardant Wirewound Resistor FREE SHIPPING
$5.99
quality
LOT OF 3 OHMITE  B12J30R RESISTORS 30 OHMS 12 WATTS
LOT OF 3 OHMITE B12J30R RESISTORS 30 OHMS 12 WATTS
$13.50
quality
Ohmite Resistors Qty 7 Used
Ohmite Resistors Qty 7 Used
$12.00
quality
29 10W OHMITE CERAMIC WIREWOUND RESISTORS NOS  75 to 20000 Ohm
29 10W OHMITE CERAMIC WIREWOUND RESISTORS NOS 75 to 20000 Ohm
$55.22
quality
Ohmite RP111FD102KK 1000 Ohm 112A Variable Resistor
Ohmite RP111FD102KK 1000 Ohm 112A Variable Resistor
$22.46
quality
Resistor 12000 ohms Ohmite 10 watts 25 pieces
Resistor 12000 ohms Ohmite 10 watts 25 pieces
$24.99
quality
OHMITE F55J5R0 THIN RESISTOR 55 WATTS 50 OHMS NEW CONDITION IN BOX
OHMITE F55J5R0 THIN RESISTOR 55 WATTS 50 OHMS NEW CONDITION IN BOX
$20.00
quality
OHMITE B8J150 8 WATT 150 OHM USPP RESISTOR WIREWOUND 8WATT 150OHM
OHMITE B8J150 8 WATT 150 OHM USPP RESISTOR WIREWOUND 8WATT 150OHM
$10.62
quality
Ohmite RW31G282 25K Ohm 10 Watt Tunnel Power Resistor Ceramic 25000 Ohm
Ohmite RW31G282 25K Ohm 10 Watt Tunnel Power Resistor Ceramic 25000 Ohm
$3.82
quality
Ohmite OMI VL 225 50 ohm 5 power resistor 7739
Ohmite OMI VL 225 50 ohm 5 power resistor 7739
$12.50
quality
10 Ohmite 2 Ohm 15W 5 Ceramic Power Resistor TUW15J2R0 USA SELLER
10 Ohmite 2 Ohm 15W 5 Ceramic Power Resistor TUW15J2R0 USA SELLER
$8.95
quality
NEW NEWARK ELECTRONICS OHMITE 25J2R2 Connectivity Resistor Lot of 19
NEW NEWARK ELECTRONICS OHMITE 25J2R2 Connectivity Resistor Lot of 19
$11.39
quality
Ohmite potentiometer CU1041 100 K ohm 10  tolerance military variable resistor
Ohmite potentiometer CU1041 100 K ohm 10 tolerance military variable resistor
$22.00
quality
Ohmite Resistors NOS 3 PCS Vitreous Enameled 100 Ohms 10 Watts Excellent
Ohmite Resistors NOS 3 PCS Vitreous Enameled 100 Ohms 10 Watts Excellent
$6.25
quality
OHMITE DIVIDOHM VITREOUS ENAMELED RESISTOR 250 OHM 200 WATTS
OHMITE DIVIDOHM VITREOUS ENAMELED RESISTOR 250 OHM 200 WATTS
$5.00
quality
OHMITE DIVIDOHM VITREOUS ENAMELED RESISTOR 1000 OHM 200 WATTS
OHMITE DIVIDOHM VITREOUS ENAMELED RESISTOR 1000 OHM 200 WATTS
$5.00
quality
OHMITE DIVIDOHM VITREOUS ENAMELED RESISTOR 500 OHM 200 WATTS
OHMITE DIVIDOHM VITREOUS ENAMELED RESISTOR 500 OHM 200 WATTS
$5.00
quality
12 Ohmite 30 Ohm 10 Watt TA Series Power Chip Thick Film Power Resistor USA
12 Ohmite 30 Ohm 10 Watt TA Series Power Chip Thick Film Power Resistor USA
$8.99
quality
12pcs Ohmite 18 Ohm 5W TA Power Chip Alumina Film Power Resistor TA305PA18R0J
12pcs Ohmite 18 Ohm 5W TA Power Chip Alumina Film Power Resistor TA305PA18R0J
$8.99
quality
New Ohmite 50 Ohm 10A Ceramic Variable Resistors Rheostat Dimmer 6558250 Pot
New Ohmite 50 Ohm 10A Ceramic Variable Resistors Rheostat Dimmer 6558250 Pot
$19.95
quality
10 NOS OHMITE 24K 1 2 WATT 5 CARBON COMP RESISTORS FOR TUBE AMPLIFIERS PARTS
10 NOS OHMITE 24K 1 2 WATT 5 CARBON COMP RESISTORS FOR TUBE AMPLIFIERS PARTS
$9.90
quality
OHMITE 45 OHM 210 WATT WIRE WOUND RESISTOR RW47V4R5
OHMITE 45 OHM 210 WATT WIRE WOUND RESISTOR RW47V4R5
$4.99
quality
New Ohmite Power Resistor L50J1K0 50 Watt OHM 1K
New Ohmite Power Resistor L50J1K0 50 Watt OHM 1K
$4.99
quality
1 OHM 10W 5 WIREWOUND CERAMIC RESISTOR OHMITE 20J1R0E
1 OHM 10W 5 WIREWOUND CERAMIC RESISTOR OHMITE 20J1R0E
$1.75
quality
OHMITE Vintage 20000 Ohm NOS Resistor
OHMITE Vintage 20000 Ohm NOS Resistor
$9.99
quality
OHMITE Vintage 25000 Ohm  160 Watts Resistor
OHMITE Vintage 25000 Ohm 160 Watts Resistor
$9.99
quality
25422268 RESISTOR VARIABLE OHMITE NOS TA 7
25422268 RESISTOR VARIABLE OHMITE NOS TA 7
$71.95
quality
OHMITE Vintage 50000 Ohm NOS Resistor
OHMITE Vintage 50000 Ohm NOS Resistor
$9.99
quality
OHMITE Vintage 35000 Ohm NOS Resistor
OHMITE Vintage 35000 Ohm NOS Resistor
$9.99
quality
4 OHMITE Vintage 10000 Ohm NOS Resistor 10 watt
4 OHMITE Vintage 10000 Ohm NOS Resistor 10 watt
$7.99
quality
5pcs Ohmite 22 OHM 325W 5 Wirewound Resistor FREE S H
5pcs Ohmite 22 OHM 325W 5 Wirewound Resistor FREE S H
$3.99
quality
100 Pcs Carbon Comp Resistor Ohmite 560K Ohm 1 4 Watt 5 RC07GF564J
100 Pcs Carbon Comp Resistor Ohmite 560K Ohm 1 4 Watt 5 RC07GF564J
$6.41
quality
Ohmite Dividohm 210 25K 40 20 Ohm 25 W Adj Resistor
Ohmite Dividohm 210 25K 40 20 Ohm 25 W Adj Resistor
$2.77
quality
Lot of 4 Ohmite F30J3K0 Thin resistor 30 Watt
Lot of 4 Ohmite F30J3K0 Thin resistor 30 Watt
$30.00
quality
50 ohm 5 Watt OHMITE Y 18 9955B Vitreous WireWound Resistor Axial Lot of 5
50 ohm 5 Watt OHMITE Y 18 9955B Vitreous WireWound Resistor Axial Lot of 5
$17.50
quality
OHMITE 65076 CERAMIC 5 10 1 2IN LENGTH 6 IN 1 30OHM RESISTOR D252593
OHMITE 65076 CERAMIC 5 10 1 2IN LENGTH 6 IN 1 30OHM RESISTOR D252593
$30.00
quality
Ohmite L50J100 100 Ohms 50W WW Resistor
Ohmite L50J100 100 Ohms 50W WW Resistor
$2.88
quality
Ohmite Resistor TAP600K5R 5 Ohms 600W Chassis Mount Nice
Ohmite Resistor TAP600K5R 5 Ohms 600W Chassis Mount Nice
$8.95
quality
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Ohmite Resistors

See More About:    Ohmite Resistor        
680V over OHMITE 100 ohm 225W resistor

The Test Methods and Experiences of 8 Resistors

1. Fixed Resistor Testing.

A. Connect the two probes(regardless of positive and negative) to the pins of resistors respecially, the actual resistance value will be measured. In order to improve the measurement accuracy, the measured resistance should be based on the size of the nominal value to select the range. As the scale of the nonlinear Ohm's block, dividing it in the middle of a more refined, pointer indicates the value should be possible to scale fell on the middle position, that is the start of full scale of 20% to 80% within the arc to make the measurements more accurate. According to a different level of resistance error. Reading between the nominal resistance were allowed ± 5%, ± 10% or ± 20% error. If we do not match, beyond the error range, then the resistance value change the value.

B. Note: When you are testing, particularly in the resistance measured over tens of kΩ resistor, hands do not touch the probe and resistance of the conductive part; be detected in the welding of the resistance from the circuit down, at least open a welding head, in order to avoid circuit The impact on other components of the test, resulting in measurement residual; the resistance value of color ring resistor can be able to determined by color ring marks, but is best to test the actual resistance using a multimeter.

2. Cement Resistance Testing.

Detection of resistance of cement and precautions to ordinary fixed resistor with the same test.

3. Fuse Resistors Test.

In the circuit, when the fuse resistor fuse open, you can make judgments based on experience: If it is found fuse resistors or charred black surface, it can be concluded that the overload rating of the current through it many times over due; If the surface without any trace of the open, it indicates that the current flow is equal to or just greater than the rated fuse value of sales. For the surface without any trace of the fuse resistor to judge good or bad, can make use of the multimeter to measure the R × 1 block, to ensure accurate measurement, it should fuse resistors from the circuit on one end of the next weld. If the measured resistance is infinite, then the fuse has failed open circuit resistor, if the measured resistance falls far short of the nominal value, that value of resistance change, we should not be used. In the maintenance of practice found that a small number of resistors in the circuit fuse is short breakdown phenomenon, attention should also be detected.

4. Potentiometer Detection.

Check the potentiometer, the first to turn the rotating handle, turn handle to see whether the smooth rotation, the switch is flexible, switch-pass, short "clicks" is crisp, and listen to the potentiometer and the resistance of the contact point within the body of friction sound, if any "imperfections" sound, indicating poor quality. Test with a multimeter, the first based on the size of the measured resistance of the potentiometer, the appropriate choice of a good multimeter resistance gear, and then according to the following method for testing.

A. Measured with a multimeter's ohm block "1" "2" at both ends, the reading should be nominal for the potentiometer resistance, such as the meter pointer does not move a lot of difference, or resistance, it indicates that the potentiometer is damaged.

B. Detect whether the activities of the potentiometer arm and the resistance of film contact is good or not. The ohm meter test block with "1" "2" ("2" "3") ends of the potentiometer shaft counterclockwise rotation to close the "off" position, when the resistance value as possible. Handle clockwise rotation axis and then slowly, the resistance value should be increased gradually, the pointer in the header should be a smooth move. When the spin axis of the handle to the extreme position of "3", the resistance should be close to the nominal value of the potentiometer. If the multimeter pointer handle potentiometer shaft rotation in the process of jumps, indicating active fault contacts are bad.

5. Positive Temperature Coefficient Thermistor (PTC) Detection.

When detecting, with a multimeter R × 1 block, concrete and two-step operation:

A. Room Temperature Testing (room temperature close to 25 ℃): the two probes touch the two pins PTC thermistors measure the actual resistance, and with the relative ratio of the nominal resistance, the difference between the two is the normal within the ± 2Ω. If the nominal resistance and the resistance of the actual difference is too large, then the performance is bad or damaged.

B. Heating Test: at room temperature, on the basis of the tests are normal, then a second step tests - heat detection, to a heat source (such as electric iron) near the PTC thermistor to its heating, while monitoring the resistance with a multimeter if the value increases with increasing temperature, and if so, that the normal thermal resistance, if resistance did not change, indicating that its performance became inferior and can not be used. Careful not to heat with the PTC thermistor by too close or direct contact with the thermistor in order to prevent their ruined.

6. Negative Temperature Coefficient Thermistor (NTC) Testing.

(1) Measured nominal resistance value Rt NTC thermistor with a multimeter measuring methods and measuring the same way as ordinary fixed resistor, which according to the nominal resistance of NTC thermistor select the appropriate power block can be directly measured actual Rt value. But NTC thermistor is sensitive to temperature, so the test should note the following:

A. Rt is the manufacturer at an ambient temperature measured at 25 ℃, so the Rt measured with a multimeter when the ambient temperature should also be close to 25 ℃, in order to ensure the credibility of the test.

B. Measurement of power shall not exceed the specified value, so that the current measurement error caused by thermal effects.

C. It is operating correctly. Test, and hold your hands to prevent the body temperature of the test impact.

(2) Estimate the temperature coefficient "at"

First measured the value of t1 resistance Rt1 at room temperature, then electric soldering iron for heat, close to the thermistor Rt, measure the resistance RT2, also measured with a thermometer at this time the surface of the thermistor RT and then calculated the average temperature t2.

7. Varistor Testing.

R × 1k with a multimeter to measure the varistor block between the two pins is, the reverse insulation resistance, are infinite, otherwise, that leakage current. If the measured resistance is very small, indicating varistor is damaged, can not be used.

8. Photosensitive Resistance Testing.

A. With a black piece of paper to cover the window light sensitive resistor, when the multimeter pointer remained fixed, the resistance approaches infinity. This value shows the bigger the better performance of photosensitive resistance. If this value is very small or close to zero, indicating photoresistor has burn damage, can not continue to use.

B. Will be a light transmittance of the window aligned photosensitive resistance, when the multimeter pointer swing should be more substantial, more resistance was significantly reduced. The smaller this value the better the performance that photosensitive resistance. If this value is large or even infinite, indicating that the resistance of the internal open-photosensitive damage, can no longer continue.

C. The photosensitive resistor light window light rays aligned with the black pieces of paper on top of the window shade photoresistors shaking, it stopped by the light, this time with the black pieces of paper multimeter pointer should be shaking and side to side. If the meter pointer position does not always stop with the paper in a rock and swing, indicating resistance of the photosensitive photosensitive materials have been damaged.

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