Ohmite Resistors

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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 RHS5K0 0071A AMP MAX 5000OHM 25W POTENTIOMETER RESISTOR D495333
NEW OHMITE RHS5K0 0071A AMP MAX 5000OHM 25W POTENTIOMETER RESISTOR D495333
$10.00
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 OY105KE RESISTOR CERAMIC 1MOHM 2W 10
OHMITE OY105KE RESISTOR CERAMIC 1MOHM 2W 10
$1.00
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 Ohmite Resistor 11 Meg Ohm 1 Watt 5 Carbon Composition Resistor
10 Ohmite Resistor 11 Meg Ohm 1 Watt 5 Carbon Composition Resistor
$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 VITREOUS ENAMELED POWER RESISTOR 500 OHM 50 Watts ADJUSTABLE D50K500
OHMITE VITREOUS ENAMELED POWER RESISTOR 500 OHM 50 Watts ADJUSTABLE D50K500
$5.00
quality
OHMITE DIVIDOHM RESISTOR NO 0568 250 OHMS NEW 0568
OHMITE DIVIDOHM RESISTOR NO 0568 250 OHMS NEW 0568
$20.00
quality
Ohmite 750W 22 Ohm Resistor PFE5K2R20
Ohmite 750W 22 Ohm Resistor PFE5K2R20
$100.00
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
$45.00
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
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
Ohmite C300K8RO 8 ohm Vitreous Enameled Resistors
Ohmite C300K8RO 8 ohm Vitreous Enameled Resistors
$25.00
quality
Ohmite 4 ohm Vitreous Enameled Resistors
Ohmite 4 ohm Vitreous Enameled Resistors
$30.00
quality
Ohmite 10 ohm Vitreous Enameled Resistors
Ohmite 10 ohm Vitreous Enameled Resistors
$20.00
quality
Ohmite 100 ohm Vitreous Enameled Resistors
Ohmite 100 ohm Vitreous Enameled Resistors
$15.00
quality
Ohmite 100 ohm Vitreous Enameled Resistors
Ohmite 100 ohm Vitreous Enameled Resistors
$10.00
quality
Ohmite 50 ohm Vitreous Enameled Resistors
Ohmite 50 ohm Vitreous Enameled Resistors
$20.00
quality
4 pieces Variable Resistors Ohmite p n RP102FD201KK  M22 03 00152FD htf New
4 pieces Variable Resistors Ohmite p n RP102FD201KK M22 03 00152FD htf New
$189.00
quality
OHMITE WIREWOUND 20000 OHM RESISTOR B20J20K 20W8824 NEW B20J20K
OHMITE WIREWOUND 20000 OHM RESISTOR B20J20K 20W8824 NEW B20J20K
$5.00
quality
OHMITE RESISTOR  0200H NSN 5905 00 283 5131 200OHMS 25WATTS
OHMITE RESISTOR 0200H NSN 5905 00 283 5131 200OHMS 25WATTS
$12.95
quality
Lot of 31 Miscellaneous Reosthat Resistor Switches Memcor Ohmite AS IS
Lot of 31 Miscellaneous Reosthat Resistor Switches Memcor Ohmite AS IS
$179.99
quality
Brand New No 64K4954 Ohmite L25J1R0E Resistor Power 1 Ohm 25W 5
Brand New No 64K4954 Ohmite L25J1R0E Resistor Power 1 Ohm 25W 5
$15.99
quality
OHMITE 210225P46 20 OHMS 225W DIVIDOHM RESISTOR 1356B NEW IN BOX
OHMITE 210225P46 20 OHMS 225W DIVIDOHM RESISTOR 1356B NEW IN BOX
$26.50
quality
OHMITE 210225P46 30 OHMS 225W DIVIDOHM RESISTOR 1356C NEW IN BOX
OHMITE 210225P46 30 OHMS 225W DIVIDOHM RESISTOR 1356C NEW IN BOX
$27.99
quality
OHMITE 270 175P 46 0706 175 WATTS 250 OHMS VITREOUS ENAMELED RESISTOR NIB
OHMITE 270 175P 46 0706 175 WATTS 250 OHMS VITREOUS ENAMELED RESISTOR NIB
$12.75
quality
OHMITE L225J500 225 WATTS 500 OHMS VITREOUS ENAMELED RESISTOR NIB
OHMITE L225J500 225 WATTS 500 OHMS VITREOUS ENAMELED RESISTOR NIB
$12.79
quality
7 lot ohmite 75w 1 15ohm wirewound resistors 6 long d75k1r0 d75k15r
7 lot ohmite 75w 1 15ohm wirewound resistors 6 long d75k1r0 d75k15r
$24.69
quality
7 lot ohmite 75w 100w 1 4 25 50ohm wirewound resistors 6 long
7 lot ohmite 75w 100w 1 4 25 50ohm wirewound resistors 6 long
$30.69
quality
15 Ohmite 15FR070E 070 Ohms 1 5W Axial Wirewound Current Sense Resistors
15 Ohmite 15FR070E 070 Ohms 1 5W Axial Wirewound Current Sense Resistors
$19.99
quality
15 Ohmite 15FR100E 10 Ohms 1 5W Axial Wirewound Current Sense Resistors
15 Ohmite 15FR100E 10 Ohms 1 5W Axial Wirewound Current Sense Resistors
$19.99
quality
OHMITE D175K2K5E 25 KiIohms 175W Resistor NEW NO BOX
OHMITE D175K2K5E 25 KiIohms 175W Resistor NEW NO BOX
$35.00
quality
OHMITE R 0861 7923 RHEOSTAT CERAMIC 252A AMP 80OHM RESISTOR B355193
OHMITE R 0861 7923 RHEOSTAT CERAMIC 252A AMP 80OHM RESISTOR B355193
$21.53
quality
OHMITE RESISTOR L100J250 250 OHMS
OHMITE RESISTOR L100J250 250 OHMS
$8.00
quality
Ohmite 1827 Brown Devil 2000 Ohms Resistor New
Ohmite 1827 Brown Devil 2000 Ohms Resistor New
$7.50
quality
Ohmite Wire Wound Adjustable Power Resistor 2500 ohm at 100 Watts B100F2500
Ohmite Wire Wound Adjustable Power Resistor 2500 ohm at 100 Watts B100F2500
$9.99
quality
Ohmite RV4NAYSD504A Potentiometer Pot Resistor CMU5041 NEW
Ohmite RV4NAYSD504A Potentiometer Pot Resistor CMU5041 NEW
$10.00
quality
QTY 5 D12K10RE OHMITE 10 Ohm 12W ADJ POWER CHASSIS MOUNT WIREWOUND RESISTORS
QTY 5 D12K10RE OHMITE 10 Ohm 12W ADJ POWER CHASSIS MOUNT WIREWOUND RESISTORS
$19.99
quality
Ohmite 25J500 500 OHM 5W Wirewound Resistors 25
Ohmite 25J500 500 OHM 5W Wirewound Resistors 25
$42.49
quality
MOX 750232402F Thick Film Resistors 1watt 24K 1
MOX 750232402F Thick Film Resistors 1watt 24K 1
$3.00
quality
Ohmite L225J1R0 Vitreous Enamel Lug Resistor 225 Watt 10 Ohm W O Brackets NIB
Ohmite L225J1R0 Vitreous Enamel Lug Resistor 225 Watt 10 Ohm W O Brackets NIB
$18.99
quality
OHMITE L50J100 RESISTOR 50WATTS 100 OHMS NEW IN A BOX Price Is For All 11
OHMITE L50J100 RESISTOR 50WATTS 100 OHMS NEW IN A BOX Price Is For All 11
$24.95
quality
OHMITE RESISTOR 25W 0375 NEW SURPLUS
OHMITE RESISTOR 25W 0375 NEW SURPLUS
$24.99
quality
Lot of 2 Ohmite Varriable Resistor RHL500 Model H Wat  25 Ohms  500 9928
Lot of 2 Ohmite Varriable Resistor RHL500 Model H Wat 25 Ohms 500 9928
$44.99
quality
Lot of 2 Power Wirewound Resistor 200 ohm 25W Ohmite 270 series
Lot of 2 Power Wirewound Resistor 200 ohm 25W Ohmite 270 series
$7.99
quality
Lot of 2 Power Wirewound Resistor 5K 25W Ohmite 270 series  Brackets NIB
Lot of 2 Power Wirewound Resistor 5K 25W Ohmite 270 series Brackets NIB
$7.99
quality
Lot Of 5 OHMITE Resistor 600 Ohm TAP600K1K0E TAP600K1KOE 1533W
Lot Of 5 OHMITE Resistor 600 Ohm TAP600K1K0E TAP600K1KOE 1533W
$500.00
quality
2 ohm 25W Ohmite resistor NIB Stock No 0200K
2 ohm 25W Ohmite resistor NIB Stock No 0200K
$12.00
quality
OHMITE 210 175P 46 RESISTOR 500 0HMS 175 WATTS 1161 NIB
OHMITE 210 175P 46 RESISTOR 500 0HMS 175 WATTS 1161 NIB
$14.00
quality
OHMITE 270 175P 46 RESISTOR 5K 0HMS 175 WATTS 0714 NIB
OHMITE 270 175P 46 RESISTOR 5K 0HMS 175 WATTS 0714 NIB
$14.00
quality
30x Ohmite 45JR10 5W 1 Silicone Ceramic Conformal Axial Wirewound Resistor
30x Ohmite 45JR10 5W 1 Silicone Ceramic Conformal Axial Wirewound Resistor
$17.99
quality
OHMITE LOT OF 2 270 225P 46 POWER RESISTOR NO0907 500 OHMS NEW IN BOX
OHMITE LOT OF 2 270 225P 46 POWER RESISTOR NO0907 500 OHMS NEW IN BOX
$24.99
quality
New OHMITE VARRIABLE RESISTOR PART  RHL500 Model H 25 watt 500 ohms 9928
New OHMITE VARRIABLE RESISTOR PART RHL500 Model H 25 watt 500 ohms 9928
$24.99
quality
Ohmite L50J15K Resistor new
Ohmite L50J15K Resistor new
$25.99
quality
NEW Power Resistor 150 ohm 2W 5 12mm x 4mm OEM Approved 10 ea
NEW Power Resistor 150 ohm 2W 5 12mm x 4mm OEM Approved 10 ea
$4.99
quality
QTY 2 L50J10R OHMITE CHASSIS MOUNT WIREWOUND RESISTOR 10 Ohm 50W VITREOUS
QTY 2 L50J10R OHMITE CHASSIS MOUNT WIREWOUND RESISTOR 10 Ohm 50W VITREOUS
$12.99
quality
No 08X5357 Ohmite Mc4 5007Ke Resistor N W 4Res 5Gohm 10 Dip
No 08X5357 Ohmite Mc4 5007Ke Resistor N W 4Res 5Gohm 10 Dip
$22.20
quality
Brand New No 64K9433 Ohmite 7Pa200E Thru Bolt 200 210 270 Resistor
Brand New No 64K9433 Ohmite 7Pa200E Thru Bolt 200 210 270 Resistor
$29.01
quality
No 08X5352 Ohmite Mc4 1007Ke Resistor N W 4Res 1Gohm 10 Dip
No 08X5352 Ohmite Mc4 1007Ke Resistor N W 4Res 1Gohm 10 Dip
$22.20
quality
OHMITE BROWN DEVIL POWER WIREWOUND RESISTORS 1541 15
OHMITE BROWN DEVIL POWER WIREWOUND RESISTORS 1541 15
$15.00
quality
Ohmite D100K5R0 Resistor 5 Ohms 100W NEW
Ohmite D100K5R0 Resistor 5 Ohms 100W NEW
$15.00
quality
Ohmite D175k25RE Adjustable Power Resistor 25 Ohms 10 NOS
Ohmite D175k25RE Adjustable Power Resistor 25 Ohms 10 NOS
$19.95
quality
OHMITE D225K2K5 RESISTOR with mounting brackets
OHMITE D225K2K5 RESISTOR with mounting brackets
$20.00
quality
Ohmite Ohm Ranger Stock 3420 Variable Resistor Test Box
Ohmite Ohm Ranger Stock 3420 Variable Resistor Test Box
$45.00
quality
OHMITE 4630 2K OHM WIREWOUND RESISTOR 2 W 2 NNB
OHMITE 4630 2K OHM WIREWOUND RESISTOR 2 W 2 NNB
$1.30
quality
OHMITE L225J150 RESISTOR 150 ohm 225W NEW id6475 5 5
OHMITE L225J150 RESISTOR 150 ohm 225W NEW id6475 5 5
$15.25
quality
Vintage Ohmite 0773 50 Ohms 75 Watt Resistor  New A
Vintage Ohmite 0773 50 Ohms 75 Watt Resistor New A
$24.50
quality
Lot of 5 Ohmite L25J50R Fixed Resistors 25 Watt 50 Ohms
Lot of 5 Ohmite L25J50R Fixed Resistors 25 Watt 50 Ohms
$25.00
quality
Lot of 5 Ohmite L25J12K Fixed Resistors 25 Watt 12000 12K Ohms
Lot of 5 Ohmite L25J12K Fixed Resistors 25 Watt 12000 12K Ohms
$20.00
quality
Lot of 5 Ohmite L25J12K Fixed Resistors 25 Watt 12000 12K Ohms New
Lot of 5 Ohmite L25J12K Fixed Resistors 25 Watt 12000 12K Ohms New
$15.00
quality
New Ohmite 270 25K 40 L25J3K0E RoHS Compliant Resistor 25W 3K Ohm
New Ohmite 270 25K 40 L25J3K0E RoHS Compliant Resistor 25W 3K Ohm
$3.00
quality
Lot of 8 Ohmite L25J6K0 Fixed Resistors 25 Watt 6000 6K Ohms New L25J6KO
Lot of 8 Ohmite L25J6K0 Fixed Resistors 25 Watt 6000 6K Ohms New L25J6KO
$25.00
quality
NEW OHMITE D225K10R LUG RESISTOR
NEW OHMITE D225K10R LUG RESISTOR
$20.00
quality
Ohmite Brown Devil 1514 50 ohm 5 watt POWER RESISTORS LOT OF 5
Ohmite Brown Devil 1514 50 ohm 5 watt POWER RESISTORS LOT OF 5
$9.00
quality
Ohmite L50J500 Fixed Resistor 50 Watt 500 Ohms New
Ohmite L50J500 Fixed Resistor 50 Watt 500 Ohms New
$12.00
quality
NEW IN BOX OHMITE 225 WATT LUG RESISTOR L225J1K0
NEW IN BOX OHMITE 225 WATT LUG RESISTOR L225J1K0
$20.00
quality
Ohmite Brown Devil 1745 3000ohm  3k ohm  12 watt POWER RESISTORS LOT OF 5
Ohmite Brown Devil 1745 3000ohm 3k ohm 12 watt POWER RESISTORS LOT OF 5
$14.50
quality
Ohmite Brown Devil 1767 25000ohm  25k  10 watt POWER RESISTORS LOT OF 5
Ohmite Brown Devil 1767 25000ohm 25k 10 watt POWER RESISTORS LOT OF 5
$16.00
quality
59061 10R RESISTOR VARIABLE OHMITE ALT 5905 01 042 7501 NOS AV 22
59061 10R RESISTOR VARIABLE OHMITE ALT 5905 01 042 7501 NOS AV 22
$134.10
quality
2pcs Ohmite Wirewound Power Resistor 5K Ohm 10 Watt 5 40J5K0E 5000 10W
2pcs Ohmite Wirewound Power Resistor 5K Ohm 10 Watt 5 40J5K0E 5000 10W
$6.25
quality
NEW OHMITE F55J25K 25K OHM 55W RESISTOR D486247
NEW OHMITE F55J25K 25K OHM 55W RESISTOR D486247
$12.00
quality
OHMITE DIVIDOHM  0956 100 5 OHMS VAR RESISTOR NOS ORIGINAL BOX VTG
OHMITE DIVIDOHM 0956 100 5 OHMS VAR RESISTOR NOS ORIGINAL BOX VTG
$19.99
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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