Ohmite Resistors

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2pc Ohmite 39ohm 325W Wirewound Resistor 93J39R
2pc Ohmite 39ohm 325W Wirewound Resistor 93J39R
$1.75
quality
New 50W 10 ohm 1 Metal Mite Wirewound Resistors Ohmite 850F10R Aluminum Housed
New 50W 10 ohm 1 Metal Mite Wirewound Resistors Ohmite 850F10R Aluminum Housed
$7.99
quality
Ohmite TA1K0PH50R0KE Resistor 50 ohms Power 1km 10 Resistance Tolerance
Ohmite TA1K0PH50R0KE Resistor 50 ohms Power 1km 10 Resistance Tolerance
$130.00
quality
OHMITE VITREAOUS ENAMELED RESISTORS D100K5KO
OHMITE VITREAOUS ENAMELED RESISTORS D100K5KO
$20.00
quality
Ohmite Vitreous Enameled Resistor 63 Ohm 300 Watt
Ohmite Vitreous Enameled Resistor 63 Ohm 300 Watt
$29.95
quality
OHMITE 300W 31 OHMS VITREOUS ENAMELED RESISTOR 2516 NEW
OHMITE 300W 31 OHMS VITREOUS ENAMELED RESISTOR 2516 NEW
$31.62
quality
Ohmite RHS50R Wirewound Rheostat 50 Ohms 25 Watt Variable Resistor  NEW
Ohmite RHS50R Wirewound Rheostat 50 Ohms 25 Watt Variable Resistor NEW
$19.85
quality
OHMITE 300W 40 OHMS VITREOUS ENAMELED RESISTOR 2517 NEW
OHMITE 300W 40 OHMS VITREOUS ENAMELED RESISTOR 2517 NEW
$36.59
quality
OHMITE DIVIDOHM RESISTOR NO 1360 100 OHMS NEW NO BOX 1360
OHMITE DIVIDOHM RESISTOR NO 1360 100 OHMS NEW NO BOX 1360
$20.00
quality
Ohmite Resistor D50K500 500  Ohm New
Ohmite Resistor D50K500 500 Ohm New
$7.50
quality
Ohmite Adjust Slide Power Resistor 45 Ohms 250  Watt Vitrus coating Its 10
Ohmite Adjust Slide Power Resistor 45 Ohms 250 Watt Vitrus coating Its 10
$9.65
quality
OHMITE 210225P46 225W 30 OHMS DIVIDOHM RESISTOR 1356C NEW
OHMITE 210225P46 225W 30 OHMS DIVIDOHM RESISTOR 1356C NEW
$26.35
quality
OHMITE DIVIDOHM RESISTOR 5000 OHMS NO0964 100 WATTS 0141 AMP NEW 0964
OHMITE DIVIDOHM RESISTOR 5000 OHMS NO0964 100 WATTS 0141 AMP NEW 0964
$15.00
quality
Ohmite Resistor D50K250 250  Ohm New
Ohmite Resistor D50K250 250 Ohm New
$8.50
quality
OHMITE 210225P46 225W 20 OHMS DIVIDOHM RESISTOR 1356B NEW
OHMITE 210225P46 225W 20 OHMS DIVIDOHM RESISTOR 1356B NEW
$23.65
quality
NEW LOT OF 25 OHMITE RESISTOR OH 3315 OH3315 330 OHM 2 WATT 5
NEW LOT OF 25 OHMITE RESISTOR OH 3315 OH3315 330 OHM 2 WATT 5
$10.00
quality
OHMITE MODEL P WIRE WOUND RHEOSTAT 122A 150OHM 600V AC RESISTOR B380966
OHMITE MODEL P WIRE WOUND RHEOSTAT 122A 150OHM 600V AC RESISTOR B380966
$50.00
quality
OHMITE OF361JE RESISTOR CARBON 360OHM 500MW LOT OF 38 NIB
OHMITE OF361JE RESISTOR CARBON 360OHM 500MW LOT OF 38 NIB
$12.00
quality
OHMITE B20J2K5 NEW WIREROUND RESISTORS
OHMITE B20J2K5 NEW WIREROUND RESISTORS
$15.00
quality
Ohmite Dividohm Number 0568 250 ohm 50 watt power resistor
Ohmite Dividohm Number 0568 250 ohm 50 watt power resistor
$8.00
quality
Ohmite Dividohm Number 1015 250 ohm 12 watt power resistor
Ohmite Dividohm Number 1015 250 ohm 12 watt power resistor
$5.00
quality
NEW IN BOX OHMITE 3826 FIXED RESISTOR
NEW IN BOX OHMITE 3826 FIXED RESISTOR
$6.95
quality
NEW OHMITE 0229 FIXED RESISTOR 25W 100000OHM
NEW OHMITE 0229 FIXED RESISTOR 25W 100000OHM
$7.85
quality
NEW IN BOX OHMITE 0212 FIXED RESISTOR
NEW IN BOX OHMITE 0212 FIXED RESISTOR
$5.99
quality
OHMITE 10 MEG 10KV 15W 1 25ppm Resistor Thick Film
OHMITE 10 MEG 10KV 15W 1 25ppm Resistor Thick Film
$2.50
quality
25 Vintage Ohmite 13K 5 2W Carbon Comp Resistors
25 Vintage Ohmite 13K 5 2W Carbon Comp Resistors
$19.99
quality
OHMITE 150 OHM 225W RESISTOR L225J150 NEW L225J150
OHMITE 150 OHM 225W RESISTOR L225J150 NEW L225J150
$15.00
quality
Ohmite 25 Ohm 225 Watt Wirewound Resistor
Ohmite 25 Ohm 225 Watt Wirewound Resistor
$9.99
quality
OHMITE Power Resistor 805F50R Metal Mite 5 W 89 Series
OHMITE Power Resistor 805F50R Metal Mite 5 W 89 Series
$3.00
quality
OHMITE 300W 50 OHM POWER RESISTOR C300K5R0 NEW
OHMITE 300W 50 OHM POWER RESISTOR C300K5R0 NEW
$23.55
quality
Ohmite wirewound ceramic resistors axial 90J10K 10K ohms 11watt 5 axial PK OF 4
Ohmite wirewound ceramic resistors axial 90J10K 10K ohms 11watt 5 axial PK OF 4
$15.00
quality
OHMITE CERAMIC RESISTOR NO 0211 4000 OHMS 3 EACH
OHMITE CERAMIC RESISTOR NO 0211 4000 OHMS 3 EACH
$8.00
quality
OHMITE LUG D175K5R0 RESISTOR 5 OHM 175 WATT ADJ TUBULAR WIREWOUND 10
OHMITE LUG D175K5R0 RESISTOR 5 OHM 175 WATT ADJ TUBULAR WIREWOUND 10
$28.88
quality
New OHMITE D225K2K5 Vitreous Enameled Lug Resistor 225 Watts 2500 Ohms
New OHMITE D225K2K5 Vitreous Enameled Lug Resistor 225 Watts 2500 Ohms
$40.00
quality
LOT OF 7 OHMITE D50K150 RESISTORS NEW
LOT OF 7 OHMITE D50K150 RESISTORS NEW
$40.00
quality
New O S Ohmite vitreous enameled resistor stock no 0956D 100 watt 4 ohms
New O S Ohmite vitreous enameled resistor stock no 0956D 100 watt 4 ohms
$9.99
quality
OHMITE 1361 resistor 500 ohms
OHMITE 1361 resistor 500 ohms
$20.70
quality
Ohmite Resistor 0565  50 WATTS  100 OHMS
Ohmite Resistor 0565 50 WATTS 100 OHMS
$24.00
quality
23 Ohmite bracket mount brown devil wirewound resistors 30 ohm 8 watt B8J30R
23 Ohmite bracket mount brown devil wirewound resistors 30 ohm 8 watt B8J30R
$26.99
quality
Ohmite Resistor 0958  100 WATTS  25 OHMS
Ohmite Resistor 0958 100 WATTS 25 OHMS
$24.00
quality
New O S Ohmite vitreous enameled resistor stock  0700D 175 watt 2 ohms L175J5R0
New O S Ohmite vitreous enameled resistor stock 0700D 175 watt 2 ohms L175J5R0
$14.39
quality
New O S Ohmite vitreous enameled resistor  0424 50 watt 150K ohms L50J150K
New O S Ohmite vitreous enameled resistor 0424 50 watt 150K ohms L50J150K
$9.99
quality
OHMITE RESISTOR 063 OHM 300W 2609 NEW 2609
OHMITE RESISTOR 063 OHM 300W 2609 NEW 2609
$35.00
quality
Lot of Ohmite L50J5R0 Wire Wound Power Resistor Qty 2 New Old Stock
Lot of Ohmite L50J5R0 Wire Wound Power Resistor Qty 2 New Old Stock
$9.99
quality
Vtg RHEOSTAT Light Dimmer porcelain electrical variable resistor ohmite antique
Vtg RHEOSTAT Light Dimmer porcelain electrical variable resistor ohmite antique
$28.86
quality
DALE OHMITE ASSORTED RESISTOR DRAWER CABINET 22 OHMS 470K OHMS 12X6X6IN 76200
DALE OHMITE ASSORTED RESISTOR DRAWER CABINET 22 OHMS 470K OHMS 12X6X6IN 76200
$34.99
quality
Ohmite lug resistor L225J7K5 225w 7500 ohm 225 watt NEW
Ohmite lug resistor L225J7K5 225w 7500 ohm 225 watt NEW
$30.00
quality
DALE OHMITE ASSORTED RESISTOR DRAWER CABINET 05 75000 OHMS 12X6X6IN 76198
DALE OHMITE ASSORTED RESISTOR DRAWER CABINET 05 75000 OHMS 12X6X6IN 76198
$34.99
quality
DALE OHMITE ASSORTED RESISTOR DRAWER CABINET 40 OHMS 383K OHMS 12X6X6IN 76199
DALE OHMITE ASSORTED RESISTOR DRAWER CABINET 40 OHMS 383K OHMS 12X6X6IN 76199
$34.99
quality
20ohm 12w Adjustable Wirewound Power Resistor Ohmite D12K20R 20 Ohm 12 Watt
20ohm 12w Adjustable Wirewound Power Resistor Ohmite D12K20R 20 Ohm 12 Watt
$6.00
quality
New Ohmite L12J3K9 Wirewound Resistor Chassis Mount 3900 Ohm 12 watt
New Ohmite L12J3K9 Wirewound Resistor Chassis Mount 3900 Ohm 12 watt
$7.00
quality
120 MIXED NOS 1 WT CARBON COMP RESISTORS ALLEN BRADLEY OHMITE STACKPOLE
120 MIXED NOS 1 WT CARBON COMP RESISTORS ALLEN BRADLEY OHMITE STACKPOLE
$60.00
quality
8pcs Vintage Ohmite Lectrohm 25000 22500 12500 100 OHMS Axial Resistor Lot
8pcs Vintage Ohmite Lectrohm 25000 22500 12500 100 OHMS Axial Resistor Lot
$5.99
quality
Ohmite Model 0400D Vitreous Enameled Resistors NEW OLD STOCK
Ohmite Model 0400D Vitreous Enameled Resistors NEW OLD STOCK
$9.99
quality
Ohmite Model 0400C Vitreous Enameled Resistors NEW OLD STOCK
Ohmite Model 0400C Vitreous Enameled Resistors NEW OLD STOCK
$11.99
quality
Ohmite Model 0400A Vitreous Enameled Resistors NEW OLD STOCK
Ohmite Model 0400A Vitreous Enameled Resistors NEW OLD STOCK
$10.00
quality
OHMITE L100J100 100 OHM 100 WATT RESISTOR PANEL MOUNT
OHMITE L100J100 100 OHM 100 WATT RESISTOR PANEL MOUNT
$19.00
quality
Ohmite Model 2003 Vitreous Enameled Resistors NEW OLD STOCK
Ohmite Model 2003 Vitreous Enameled Resistors NEW OLD STOCK
$10.00
quality
Ohmite Dividohm Resistor 100 Ohms No 0368 25w In Original Box Stock 0368
Ohmite Dividohm Resistor 100 Ohms No 0368 25w In Original Box Stock 0368
$0.99
quality
2 OHMITE 0388 DIVIDOHM VARIABLE RESISTOR VITREOUS ENAMELED 20K OHM 25 WATT NIB
2 OHMITE 0388 DIVIDOHM VARIABLE RESISTOR VITREOUS ENAMELED 20K OHM 25 WATT NIB
$0.99
quality
Ohmite lug resistor L100J15k 100w 15000 ohm 100 watt
Ohmite lug resistor L100J15k 100w 15000 ohm 100 watt
$10.00
quality
Ohmite 995 5B Resistor 4K Ohm 5W 8127 Pack of 10
Ohmite 995 5B Resistor 4K Ohm 5W 8127 Pack of 10
$14.95
quality
210 225P OHMITE Enamel Resistor No 1357 10 OHM 225 Watts
210 225P OHMITE Enamel Resistor No 1357 10 OHM 225 Watts
$25.59
quality
Ohmite Vitreous Enameled Resistor Part L50J200K 50 Watt 500 Ohm NEW
Ohmite Vitreous Enameled Resistor Part L50J200K 50 Watt 500 Ohm NEW
$9.97
quality
30x Ohmite 45JR10 5W 1 Silicone Ceramic Conformal Axial Wirewound Resistor
30x Ohmite 45JR10 5W 1 Silicone Ceramic Conformal Axial Wirewound Resistor
$35.99
quality
NEW Ohmite 25J68R 68 Ohm 5 Watt Wire Wound Power Resistors
NEW Ohmite 25J68R 68 Ohm 5 Watt Wire Wound Power Resistors
$0.99
quality
Ohmite 25W 10kOhms Ceramic Vitreous Enameled Resistor 270 25K 40 0215 NIB
Ohmite 25W 10kOhms Ceramic Vitreous Enameled Resistor 270 25K 40 0215 NIB
$4.99
quality
OHMITE L50J10R Vitreous Enameled Resistor 50 Watt 10 Ohm Tubular New
OHMITE L50J10R Vitreous Enameled Resistor 50 Watt 10 Ohm Tubular New
$8.25
quality
NEW OHMITE 0326 MODEL J 1000OHM 50W RHEOSTAT POTENTIOMETER RESISTOR D407803
NEW OHMITE 0326 MODEL J 1000OHM 50W RHEOSTAT POTENTIOMETER RESISTOR D407803
$16.00
quality
OHMITE VARIABLE RESISTOR D12K350 NSN 5905 00 156 6281 12 WATT 350 OHM
OHMITE VARIABLE RESISTOR D12K350 NSN 5905 00 156 6281 12 WATT 350 OHM
$8.00
quality
NEW OHMITE D75K15R VITREOUS ENAMELED RESISTOR 15OHM 17W B295360
NEW OHMITE D75K15R VITREOUS ENAMELED RESISTOR 15OHM 17W B295360
$26.00
quality
NEW Ohmite D100K10R Resistor 100 Watt
NEW Ohmite D100K10R Resistor 100 Watt
$16.99
quality
OHMITE L50J25R VITREOUS ENAMELED RESISTOR NNB
OHMITE L50J25R VITREOUS ENAMELED RESISTOR NNB
$9.99
quality
OHMITE DIVIDOHM RESISTOR NO 0574 2000 OHMS NEW SURPLUS 0574
OHMITE DIVIDOHM RESISTOR NO 0574 2000 OHMS NEW SURPLUS 0574
$20.00
quality
OHMITE DIVIDOHM RESISTOR NO 0573 1500 OHMS NEW SURPLUS 0573
OHMITE DIVIDOHM RESISTOR NO 0573 1500 OHMS NEW SURPLUS 0573
$20.00
quality
OHMITE VARIABLE RESISTOR MODEL E PN 52175 1 KOHMS 125 W NEW OLD STOCK
OHMITE VARIABLE RESISTOR MODEL E PN 52175 1 KOHMS 125 W NEW OLD STOCK
$55.00
quality
10 Pcs Ohmite 11 Meg Ohm 1 Watt 5 RC32GF116J Carbon Comp Resistors
10 Pcs Ohmite 11 Meg Ohm 1 Watt 5 RC32GF116J Carbon Comp Resistors
$9.28
quality
250 ohm 225W 5 Power Resistor Vitreous Enamel w Lugs
250 ohm 225W 5 Power Resistor Vitreous Enamel w Lugs
$8.75
quality
500 ohm 225W 5 Power Resistor Vitreous Enamel w Lugs
500 ohm 225W 5 Power Resistor Vitreous Enamel w Lugs
$8.75
quality
OHMITE DIVIDOHM RESISTOR NO 0568 250 OHMS NEW 0568
OHMITE DIVIDOHM RESISTOR NO 0568 250 OHMS NEW 0568
$20.00
quality
Wirewound Resistors Ohmite 40J10R 10 Watt 10 Ohms Lot of 50
Wirewound Resistors Ohmite 40J10R 10 Watt 10 Ohms Lot of 50
$25.00
quality
Ohmite 750W 22 Ohm Resistor PFE5K2R20
Ohmite 750W 22 Ohm Resistor PFE5K2R20
$100.00
quality
Vtg Ohmite Little Devils Resistors In Storage Cabinet Advertising Display Box
Vtg Ohmite Little Devils Resistors In Storage Cabinet Advertising Display Box
$38.00
quality
Lot of 3 Ohmite Ceramic Resistors 270N 50K 40 1K000J New Old Stock
Lot of 3 Ohmite Ceramic Resistors 270N 50K 40 1K000J New Old Stock
$18.00
quality
OHMITE RESISTORS LOT OF 6 IC9006
OHMITE RESISTORS LOT OF 6 IC9006
$48.00
quality
OHMITE 0571 DIVIDOHM ADJ WIREWOUND RESISTOR 800 OHMS 50W 0250A W BRKT NIB
OHMITE 0571 DIVIDOHM ADJ WIREWOUND RESISTOR 800 OHMS 50W 0250A W BRKT NIB
$8.97
quality
OHMITE 0563 DIVIDOHM ADJ WIREWOUND RESISTOR 50 OHMS 50W W BRACKETS 210 50K 40
OHMITE 0563 DIVIDOHM ADJ WIREWOUND RESISTOR 50 OHMS 50W W BRACKETS 210 50K 40
$4.97
quality
OHMITE 0563 DIVIDOHM ADJ WIREWOUND RESISTOR 50 OHMS 50W W BRKT 210 50K 40 NIB
OHMITE 0563 DIVIDOHM ADJ WIREWOUND RESISTOR 50 OHMS 50W W BRKT 210 50K 40 NIB
$9.97
quality
OHMITE 0400D VITREOUS ENAMELED WIREWOUND RESISTOR 50 OHMS 50W W BRKT NNB
OHMITE 0400D VITREOUS ENAMELED WIREWOUND RESISTOR 50 OHMS 50W W BRKT NNB
$8.97
quality
OHMITE 0564 DIVIDOHM ADJ WIREWOUND RESISTOR 75 OHMS 50W 0816A W BRACKETS
OHMITE 0564 DIVIDOHM ADJ WIREWOUND RESISTOR 75 OHMS 50W 0816A W BRACKETS
$5.97
quality
NEW OHMITE 175 WATT 50 OHM Resistor No D175K50R
NEW OHMITE 175 WATT 50 OHM Resistor No D175K50R
$10.00
quality
Ohmite Resistor New Factory Sealed L25JR0 25W 2 OHM
Ohmite Resistor New Factory Sealed L25JR0 25W 2 OHM
$4.95
quality
RP1515D103KK VAR RESISTOR OHMITE M22 05 00291SD 749 1032 000 NOS D 5
RP1515D103KK VAR RESISTOR OHMITE M22 05 00291SD 749 1032 000 NOS D 5
$116.95
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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