Ohmite Resistors

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4  OHMITE RESISTORS L100J2K5  0612 100W 2500OHMS
4 OHMITE RESISTORS L100J2K5 0612 100W 2500OHMS
$32.00
quality
Wirewound Resistors Through Hole 5W 5K ohm 1 1 piece
Wirewound Resistors Through Hole 5W 5K ohm 1 1 piece
$4.63
quality
Ohmite 2 OHM 225W Ceramic Resistor L225J2R0 NNB
Ohmite 2 OHM 225W Ceramic Resistor L225J2R0 NNB
$10.19
quality
Ohmite 0705 Wire Wound Resistor 150 OHM 175W NNB
Ohmite 0705 Wire Wound Resistor 150 OHM 175W NNB
$11.22
quality
Ohmite 90J10K Resistor Power 10K OHM 11W Lot of 4 NIB
Ohmite 90J10K Resistor Power 10K OHM 11W Lot of 4 NIB
$3.07
quality
5 Ohmite Wirewound Mil Spec 11W One 1 Ohm 5 Resistor  RW29V1R0
5 Ohmite Wirewound Mil Spec 11W One 1 Ohm 5 Resistor RW29V1R0
$9.95
quality
OHMITE DIVIDOHM RESISTOR NO 1360 225 WATTS 100 OHMS
OHMITE DIVIDOHM RESISTOR NO 1360 225 WATTS 100 OHMS
$25.00
quality
Ohmite 0962B Woundwire Resistor 1500 OHM 100W NNB
Ohmite 0962B Woundwire Resistor 1500 OHM 100W NNB
$11.88
quality
Ohmite 50W 200Ohm Vitreous Enamel Power Resistor L50J200 NIB
Ohmite 50W 200Ohm Vitreous Enamel Power Resistor L50J200 NIB
$6.15
quality
Ohmite 50W 10Ohm Vitreous Enamel Power Resistor L50J10R NIB
Ohmite 50W 10Ohm Vitreous Enamel Power Resistor L50J10R NIB
$7.10
quality
US Seller 85 pcs OHMITE BROWN DEVIL WIRE WOUND RESISTORS ASSORTED CAPACITIES NOS
US Seller 85 pcs OHMITE BROWN DEVIL WIRE WOUND RESISTORS ASSORTED CAPACITIES NOS
$14.99
quality
Ohmite 05Ohm 35W Wirewound Power Resistor C35KR50 NIB
Ohmite 05Ohm 35W Wirewound Power Resistor C35KR50 NIB
$5.34
quality
LOT OF 10 Ohmite 20W 50 ohms brown devil wirewound resistor B20J50R w OG box
LOT OF 10 Ohmite 20W 50 ohms brown devil wirewound resistor B20J50R w OG box
$17.40
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
$13.39
quality
5 pcs 47F10R Ohmite 7 Watt 10 Ohm 1 Wirewound Silicone Coated Resistor
5 pcs 47F10R Ohmite 7 Watt 10 Ohm 1 Wirewound Silicone Coated Resistor
$17.50
quality
20 pcs 602SJR00300 Ohmite 1 4 Watt 0003 Ohm 5 Current Sense Resistor SMT
20 pcs 602SJR00300 Ohmite 1 4 Watt 0003 Ohm 5 Current Sense Resistor SMT
$17.75
quality
20 pcs 602SJR00500 Ohmite 1 4 Watt 0005 Ohm 5 Current Sense Resistor SMT
20 pcs 602SJR00500 Ohmite 1 4 Watt 0005 Ohm 5 Current Sense Resistor SMT
$17.75
quality
25 pcs 603HR010 Ohmite 1 4 Watt 001 Ohm 3 Current Sense Resistor Axial
25 pcs 603HR010 Ohmite 1 4 Watt 001 Ohm 3 Current Sense Resistor Axial
$12.50
quality
25 pcs 603HR015 Ohmite 1 4 Watt 0015 Ohm 3 Current Sense Resistor Axial
25 pcs 603HR015 Ohmite 1 4 Watt 0015 Ohm 3 Current Sense Resistor Axial
$12.50
quality
25 pcs 604HR020 Ohmite 3 8 Watt 002 Ohm 3 Current Sense Resistor Axial
25 pcs 604HR020 Ohmite 3 8 Watt 002 Ohm 3 Current Sense Resistor Axial
$12.50
quality
20 pcs 605SJR00500 Ohmite 1 2 Watt 0005 Ohm 5 Current Sense Resistor SMT
20 pcs 605SJR00500 Ohmite 1 2 Watt 0005 Ohm 5 Current Sense Resistor SMT
$17.75
quality
25 pcs 607HR005 Ohmite 3 4 Watt 0005 Ohm 3 Current Sense Resistor Axial
25 pcs 607HR005 Ohmite 3 4 Watt 0005 Ohm 3 Current Sense Resistor Axial
$12.50
quality
10 pcs 7CJ5K1 Ohmite 7 Watt 51K Ohm 5 Wirewound Resistor Axial
10 pcs 7CJ5K1 Ohmite 7 Watt 51K Ohm 5 Wirewound Resistor Axial
$18.75
quality
3 pcs 805F300 Ohmite 5 Watt 300 Ohm 1 Wirewound Resistor Chassis Mount
3 pcs 805F300 Ohmite 5 Watt 300 Ohm 1 Wirewound Resistor Chassis Mount
$16.50
quality
5 pcs 80F40R2 Ohmite 10 Watt 402 Ohm 1 WirewoundSilicone CoatedResistor
5 pcs 80F40R2 Ohmite 10 Watt 402 Ohm 1 WirewoundSilicone CoatedResistor
$17.50
quality
5 pcs 810F20R Ohmite 10 Watt 20 Ohm 1 Wirewound Resistor Chassis Mount
5 pcs 810F20R Ohmite 10 Watt 20 Ohm 1 Wirewound Resistor Chassis Mount
$17.50
quality
5 pcs 81F18R2 Ohmite 1 Watt 182 Ohm 1 Wirewound Silicone Coated Resistor
5 pcs 81F18R2 Ohmite 1 Watt 182 Ohm 1 Wirewound Silicone Coated Resistor
$17.50
quality
5 pcs 81F200 Ohmite 1 Watt 200 Ohm 1 Wirewound Silicone Coated Resistor
5 pcs 81F200 Ohmite 1 Watt 200 Ohm 1 Wirewound Silicone Coated Resistor
$17.50
quality
5 pcs 81F49R9 Ohmite 1 Watt 499 Ohm 1 Wirewound Silicone Coated Resistor
5 pcs 81F49R9 Ohmite 1 Watt 499 Ohm 1 Wirewound Silicone Coated Resistor
$17.50
quality
3 pcs 825F15K Ohmite 25 Watt 15K Ohm 1 Wirewound Resistor Chassis Mount
3 pcs 825F15K Ohmite 25 Watt 15K Ohm 1 Wirewound Resistor Chassis Mount
$16.75
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
825F619 Ohmite 25 Watt 619 Ohm 1 Wirewound Resistor Chassis Mount
825F619 Ohmite 25 Watt 619 Ohm 1 Wirewound Resistor Chassis Mount
$17.50
quality
825J74R Ohmite 25 Watt 74 Ohm 5 Wirewound Resistor Chassis Mount
825J74R Ohmite 25 Watt 74 Ohm 5 Wirewound Resistor Chassis Mount
$17.50
quality
10 pcs 83F100 Ohmite 3 Watt 100 Ohm 1 Wirewound Silicone Coated Resistor
10 pcs 83F100 Ohmite 3 Watt 100 Ohm 1 Wirewound Silicone Coated Resistor
$19.75
quality
10 pcs 83F16R2 Ohmite 3 Watt 162 Ohm 1 WirewoundSilicone CoatedResistor
10 pcs 83F16R2 Ohmite 3 Watt 162 Ohm 1 WirewoundSilicone CoatedResistor
$19.75
quality
10 pcs 83F1R82 Ohmite 3 Watt 182 Ohm 1 WirewoundSilicone CoatedResistor
10 pcs 83F1R82 Ohmite 3 Watt 182 Ohm 1 WirewoundSilicone CoatedResistor
$19.75
quality
10 pcs 83F24R9 Ohmite 3 Watt 249 Ohm 1 WirewoundSilicone CoatedResistor
10 pcs 83F24R9 Ohmite 3 Watt 249 Ohm 1 WirewoundSilicone CoatedResistor
$19.75
quality
10 pcs 83F3K32 Ohmite 3 Watt 332K Ohm 1 WirewoundSilicone CoatedResistor
10 pcs 83F3K32 Ohmite 3 Watt 332K Ohm 1 WirewoundSilicone CoatedResistor
$19.75
quality
10 pcs 83F6R81 Ohmite 3 Watt 681 Ohm 1 WirewoundSilicone CoatedResistor
10 pcs 83F6R81 Ohmite 3 Watt 681 Ohm 1 WirewoundSilicone CoatedResistor
$19.75
quality
10 pcs 83F7R5 Ohmite 3 Watt 75 Ohm 1 Wirewound Silicone Coated Resistor
10 pcs 83F7R5 Ohmite 3 Watt 75 Ohm 1 Wirewound Silicone Coated Resistor
$19.75
quality
10 pcs 83FR511 Ohmite 3 Watt 0511 Ohm 1 WirewoundSilicone CoatedResistor
10 pcs 83FR511 Ohmite 3 Watt 0511 Ohm 1 WirewoundSilicone CoatedResistor
$19.75
quality
10 Ohmite Resistor 430K Ohm 2 Watt 5 Carbon Comp RC42GF434J
10 Ohmite Resistor 430K Ohm 2 Watt 5 Carbon Comp RC42GF434J
$8.60
quality
850FR050 Ohmite 50 Watt 005 Ohm 1 Wirewound Resistor Chassis Mount
850FR050 Ohmite 50 Watt 005 Ohm 1 Wirewound Resistor Chassis Mount
$15.50
quality
Ohmite L225J5R0 Ceramic Resistor 225W 5OHM USED
Ohmite L225J5R0 Ceramic Resistor 225W 5OHM USED
$19.99
quality
Ohmite C300K10R Wirewound Resistor 300W 10OHM NOP
Ohmite C300K10R Wirewound Resistor 300W 10OHM NOP
$24.99
quality
Ohmite L100J3R0 Wirewound Resistor 100W 3OHM USED
Ohmite L100J3R0 Wirewound Resistor 100W 3OHM USED
$7.99
quality
850NF100R Ohmite 50 Watt 100 Ohm 1 Wirewound Resistor Chassis Mount
850NF100R Ohmite 50 Watt 100 Ohm 1 Wirewound Resistor Chassis Mount
$15.50
quality
850NF56R Ohmite 50 Watt 56 Ohm 1 Wirewound Resistor Chassis Mount
850NF56R Ohmite 50 Watt 56 Ohm 1 Wirewound Resistor Chassis Mount
$15.50
quality
RESISTOR OHMITE Wire Wound 100 W 10 ohm
RESISTOR OHMITE Wire Wound 100 W 10 ohm
$11.50
quality
NEW NOT IN BOX OHMITE 271H 8HA 40 RESISTOR
NEW NOT IN BOX OHMITE 271H 8HA 40 RESISTOR
$6.99
quality
RESISTOR OHMITE Wire Wound 100 W 1k ohm
RESISTOR OHMITE Wire Wound 100 W 1k ohm
$14.50
quality
Ohmite RJS225 Resistor
Ohmite RJS225 Resistor
$35.00
quality
LOT OF 5 OHMITE ELECTRICAL RESISTORS 0600B 10 OHMS
LOT OF 5 OHMITE ELECTRICAL RESISTORS 0600B 10 OHMS
$55.20
quality
LOT OF TEN 10 OHMITE 5 ohm 200 225 watts RESISTORS stock 0900A NOS
LOT OF TEN 10 OHMITE 5 ohm 200 225 watts RESISTORS stock 0900A NOS
$249.99
quality
Ohmite Ceramic Power Resistors L225J100 100 Ohm 225 Watts 5 New Old Stock
Ohmite Ceramic Power Resistors L225J100 100 Ohm 225 Watts 5 New Old Stock
$13.88
quality
NEW OHMITE D225K5R0 5OHM 225W RESISTOR D451283
NEW OHMITE D225K5R0 5OHM 225W RESISTOR D451283
$10.00
quality
OHMITE SPEC 58108 IC900 15 OHM 813 A CAGED RESISTORS
OHMITE SPEC 58108 IC900 15 OHM 813 A CAGED RESISTORS
$79.99
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
LOT OF 4 OHMITE 500 ohm 225 WATTS RESISTORS stock 0907 NEW IN BOX
LOT OF 4 OHMITE 500 ohm 225 WATTS RESISTORS stock 0907 NEW IN BOX
$88.22
quality
LOT OF 5 NEW IN BOX OHMITE RESISTORS L12J10K 10000 OHMS 5 DR1D 1
LOT OF 5 NEW IN BOX OHMITE RESISTORS L12J10K 10000 OHMS 5 DR1D 1
$15.00
quality
Ohmite 2  ohm 20 W Watt Ceramic WW Resistor Stereo Load Test Performance New
Ohmite 2 ohm 20 W Watt Ceramic WW Resistor Stereo Load Test Performance New
$3.96
quality
Ohmite L225J250E 250 225W 5 4595kV Wirewound Through Hole Resistor 2pcs
Ohmite L225J250E 250 225W 5 4595kV Wirewound Through Hole Resistor 2pcs
$30.00
quality
OHMITE TAP600K1R0 RESISTOR 10 OHM 600W 10
OHMITE TAP600K1R0 RESISTOR 10 OHM 600W 10
$86.99
quality
NEW OHMITE RPS15R RHEOSTAT 15OHM 600V AC 225W POTENTIOMETER RESISTOR D518650
NEW OHMITE RPS15R RHEOSTAT 15OHM 600V AC 225W POTENTIOMETER RESISTOR D518650
$253.13
quality
Box of 25 Ohmite Wirewound Resistors 45NJ10R 10 Ohms 5 Tolerance 5 Watts NOS
Box of 25 Ohmite Wirewound Resistors 45NJ10R 10 Ohms 5 Tolerance 5 Watts NOS
$49.99
quality
Ohmite Resistor B12J2K5E 2500  OHM 12W Lot of 2 New
Ohmite Resistor B12J2K5E 2500 OHM 12W Lot of 2 New
$8.40
quality
10 pcs 85F200 Ohmite 5 Watt 200 Ohm 1 Wirewound Silicone Coated Resistor
10 pcs 85F200 Ohmite 5 Watt 200 Ohm 1 Wirewound Silicone Coated Resistor
$17.50
quality
10 pcs 85F2K74 Ohmite 5 Watt 274K Ohm 1 WirewoundSilicone CoatedResistor
10 pcs 85F2K74 Ohmite 5 Watt 274K Ohm 1 WirewoundSilicone CoatedResistor
$17.50
quality
10 pcs 85F3R32 Ohmite 5 Watt 332 Ohm 1 WirewoundSilicone CoatedResistor
10 pcs 85F3R32 Ohmite 5 Watt 332 Ohm 1 WirewoundSilicone CoatedResistor
$17.50
quality
5 pcs 85FR499 Ohmite 5 Watt 0499 Ohm 1 WirewoundSilicone CoatedResistor
5 pcs 85FR499 Ohmite 5 Watt 0499 Ohm 1 WirewoundSilicone CoatedResistor
$17.75
quality
5 pcs 90J300 Ohmite 11 Watt 300 Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs 90J300 Ohmite 11 Watt 300 Ohm 5 Wirewound Vitreous Enamel Resistor
$17.75
quality
5PCS OHMITE TCH TCH35P5R60JE 56 OHM 35W TO220 RESISTOR BOX11
5PCS OHMITE TCH TCH35P5R60JE 56 OHM 35W TO220 RESISTOR BOX11
$3.95
quality
5 pcs 90J33R Ohmite 11 Watt 33 Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs 90J33R Ohmite 11 Watt 33 Ohm 5 Wirewound Vitreous Enamel Resistor
$17.75
quality
5 pcs 90J470 Ohmite 11 Watt 470 Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs 90J470 Ohmite 11 Watt 470 Ohm 5 Wirewound Vitreous Enamel Resistor
$17.75
quality
3 pcs 91J1R3 Ohmite 15 Watt 13 Ohm 5 Wirewound Vitreous Enamel Resistor
3 pcs 91J1R3 Ohmite 15 Watt 13 Ohm 5 Wirewound Vitreous Enamel Resistor
$16.75
quality
5 pcs 92J220 Ohmite 225 Watt 220 Ohm 5 WirewoundVitreous EnamelResistor
5 pcs 92J220 Ohmite 225 Watt 220 Ohm 5 WirewoundVitreous EnamelResistor
$17.50
quality
5 pcs 92J22R Ohmite 225 Watt 22 Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs 92J22R Ohmite 225 Watt 22 Ohm 5 Wirewound Vitreous Enamel Resistor
$17.50
quality
5 pcs 92J27R Ohmite 225 Watt 27 Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs 92J27R Ohmite 225 Watt 27 Ohm 5 Wirewound Vitreous Enamel Resistor
$17.50
quality
5 pcs 92J2K0 Ohmite 225 Watt 2K Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs 92J2K0 Ohmite 225 Watt 2K Ohm 5 Wirewound Vitreous Enamel Resistor
$17.50
quality
5 pcs 92J2R7 Ohmite 225 Watt 27 Ohm 5 WirewoundVitreous EnamelResistor
5 pcs 92J2R7 Ohmite 225 Watt 27 Ohm 5 WirewoundVitreous EnamelResistor
$17.50
quality
5 pcs 92J3R9 Ohmite 225 Watt 39 Ohm 5 WirewoundVitreous EnamelResistor
5 pcs 92J3R9 Ohmite 225 Watt 39 Ohm 5 WirewoundVitreous EnamelResistor
$17.50
quality
5 pcs 92J62R Ohmite 225 Watt 62 Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs 92J62R Ohmite 225 Watt 62 Ohm 5 Wirewound Vitreous Enamel Resistor
$17.50
quality
5 pcs 92J6R2 Ohmite 225 Watt 62 Ohm 5 WirewoundVitreous EnamelResistor
5 pcs 92J6R2 Ohmite 225 Watt 62 Ohm 5 WirewoundVitreous EnamelResistor
$17.50
quality
5 pcs 93H75R Ohmite 325 Watt 75 Ohm 3 Wirewound Vitreous Enamel Resistor
5 pcs 93H75R Ohmite 325 Watt 75 Ohm 3 Wirewound Vitreous Enamel Resistor
$17.50
quality
5 pcs 95J12K Ohmite 5 Watt 12K Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs 95J12K Ohmite 5 Watt 12K Ohm 5 Wirewound Vitreous Enamel Resistor
$17.50
quality
Ohmite D12K500 Resistor 12watt 500ohm
Ohmite D12K500 Resistor 12watt 500ohm
$8.79
quality
OHMITE L25J500 500 OHMS 25 W RESISTOR
OHMITE L25J500 500 OHMS 25 W RESISTOR
$4.00
quality
5 pcs 95J1K8 Ohmite 5 Watt 18K Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs 95J1K8 Ohmite 5 Watt 18K Ohm 5 Wirewound Vitreous Enamel Resistor
$17.50
quality
5 pcs 95J3R3 Ohmite 5 Watt 33 Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs 95J3R3 Ohmite 5 Watt 33 Ohm 5 Wirewound Vitreous Enamel Resistor
$17.50
quality
95J25R OHMITE MFG RESISTOR WIREWOUND 25 OHM 5W 5 AXIAL
95J25R OHMITE MFG RESISTOR WIREWOUND 25 OHM 5W 5 AXIAL
$1.73
quality
LOT OF 3 OHMITE DIVIDOHM 210 225P 46 No1360 100 OHMS 225W 8127 RESISTOR
LOT OF 3 OHMITE DIVIDOHM 210 225P 46 No1360 100 OHMS 225W 8127 RESISTOR
$23.20
quality
LOT OF 2 OHMITE DIVIDOHM 210 225P 46 No1358 25 OHMS 225W B 40 RESISTOR
LOT OF 2 OHMITE DIVIDOHM 210 225P 46 No1358 25 OHMS 225W B 40 RESISTOR
$15.20
quality
Qty 5 Ohmite Enamel Resistor 270 225P 46 No 0911 2 K 225 Watts 79 26 Resistors
Qty 5 Ohmite Enamel Resistor 270 225P 46 No 0911 2 K 225 Watts 79 26 Resistors
$50.00
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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