Ohmite Resistors

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OHMITE E300K16R WIREWOUND RESISTOR 16 OHM 300 W
OHMITE E300K16R WIREWOUND RESISTOR 16 OHM 300 W
$20.00
quality
Resistor Tru Ohm AR75 100 Ohm adjustable vitreous enamel wire wound
Resistor Tru Ohm AR75 100 Ohm adjustable vitreous enamel wire wound
$15.75
quality
Resistor Tru Ohm 15 Ohm fixed vitreous enamel wire wound 85 inches by 1 inch
Resistor Tru Ohm 15 Ohm fixed vitreous enamel wire wound 85 inches by 1 inch
$15.75
quality
High Watt Wire Wound Ceramic Sandbar Resistors NEW
High Watt Wire Wound Ceramic Sandbar Resistors NEW
$4.85
quality
2 Pcs Ohmite 100 OHM 100 WATT Enameled Wire Wound RESISTOR PANEL MOUNT
2 Pcs Ohmite 100 OHM 100 WATT Enameled Wire Wound RESISTOR PANEL MOUNT
$5.00
quality
2 Pcs Ohmite 750 OHM 100 WATT Enameled Wire Wound RESISTOR PANEL MOUNT NIB
2 Pcs Ohmite 750 OHM 100 WATT Enameled Wire Wound RESISTOR PANEL MOUNT NIB
$5.00
quality
Resistor Ohmite 3000 Ohm 100 Watt Fixed 0613 vitreous enamel wire wound
Resistor Ohmite 3000 Ohm 100 Watt Fixed 0613 vitreous enamel wire wound
$12.00
quality
SYNTRON 15053 A 80OHM OHMITE VIBRATORY FEEDER RESISTOR D562946
SYNTRON 15053 A 80OHM OHMITE VIBRATORY FEEDER RESISTOR D562946
$50.00
quality
Ohmite Wirewound Resistor P N D12K400E
Ohmite Wirewound Resistor P N D12K400E
$7.61
quality
Ohmite B5J10RE 10 Ohms Resistor Pack of 5
Ohmite B5J10RE 10 Ohms Resistor Pack of 5
$15.00
quality
Ohmite resistor d225k250 new in original box
Ohmite resistor d225k250 new in original box
$6.00
quality
25 Ohmite 330 Ohms 5 1W Carbon Comp Resistors
25 Ohmite 330 Ohms 5 1W Carbon Comp Resistors
$26.99
quality
Ohmite PFE5K5R40E Powr Rib Edgewound Resistor 54 Ohms 752 Watts 118 Amps
Ohmite PFE5K5R40E Powr Rib Edgewound Resistor 54 Ohms 752 Watts 118 Amps
$13.99
quality
Ohmite PFE5K8R50 Powr Rib Edgewound Resistor 85 Ohms 751 Watts 94 Amps
Ohmite PFE5K8R50 Powr Rib Edgewound Resistor 85 Ohms 751 Watts 94 Amps
$13.99
quality
2 New OHMITE Power Resistors 5 Ohms At 225 Watts L225J5R0
2 New OHMITE Power Resistors 5 Ohms At 225 Watts L225J5R0
$4.99
quality
NEW LOT OF 2 OHMITE 23J7K5 CERAMIC WIREWOUND RESISTORS
NEW LOT OF 2 OHMITE 23J7K5 CERAMIC WIREWOUND RESISTORS
$5.00
quality
OHMITE 0160 SERIES A POWER RESISTOR POT 2500 OHM
OHMITE 0160 SERIES A POWER RESISTOR POT 2500 OHM
$9.99
quality
Ohmite L50J25R 50W Resistor
Ohmite L50J25R 50W Resistor
$24.99
quality
OHMITE DIVIDOHM 2500 OHMS 225W ENAMELED RESISTOR D225K2K5 NNB
OHMITE DIVIDOHM 2500 OHMS 225W ENAMELED RESISTOR D225K2K5 NNB
$24.99
quality
ohmite resistor
ohmite resistor
$8.00
quality
2 1W 10 Carbon Comp Resistors Ohmite Allen Bradley Vintage NOS OG series
2 1W 10 Carbon Comp Resistors Ohmite Allen Bradley Vintage NOS OG series
$1.00
quality
OHMITE VITREOUS ENAMELED RESISTORS L100J100  100 WATT 100 OHM NEW
OHMITE VITREOUS ENAMELED RESISTORS L100J100 100 WATT 100 OHM NEW
$14.00
quality
NIB LOT OF 3 OHMITE 1362 225W 1K OHM RESISTOR CN O BOTTOM
NIB LOT OF 3 OHMITE 1362 225W 1K OHM RESISTOR CN O BOTTOM
$60.00
quality
OHMITE 200K OHMS NOS PRECISION WIREWOUND NON INDUCTIVE RESISTOR
OHMITE 200K OHMS NOS PRECISION WIREWOUND NON INDUCTIVE RESISTOR
$5.47
quality
Ohmite Corrib Resistor 16 Ohms 300 Watts with Brackets 2513
Ohmite Corrib Resistor 16 Ohms 300 Watts with Brackets 2513
$23.28
quality
Ohmite C300 10RE Lug Resistor 10 10 Ohms New
Ohmite C300 10RE Lug Resistor 10 10 Ohms New
$29.99
quality
OHMITE RESISTOR  271H 75UA 40 2K20 NSN 5905 01 339 3434
OHMITE RESISTOR 271H 75UA 40 2K20 NSN 5905 01 339 3434
$14.99
quality
LOT OF 6 Ohmite L50J10R 50W 10 Ohms Resistor No 0400B FREE SHIPPING
LOT OF 6 Ohmite L50J10R 50W 10 Ohms Resistor No 0400B FREE SHIPPING
$49.95
quality
LOT OF 5 Ohmite L50J25R 50W 25 Ohms Resistor No 0400B FREE SHIPPING
LOT OF 5 Ohmite L50J25R 50W 25 Ohms Resistor No 0400B FREE SHIPPING
$39.95
quality
NEW Ohmite 15 Ohm 25 Watt Fixed Value Tubular Ceramic Power Resistor L25J15R
NEW Ohmite 15 Ohm 25 Watt Fixed Value Tubular Ceramic Power Resistor L25J15R
$3.99
quality
2 2W 5 10 Carbon Comp Resistors Ohmite Allen Bradley Vintage NOS OH series
2 2W 5 10 Carbon Comp Resistors Ohmite Allen Bradley Vintage NOS OH series
$1.00
quality
Ohmite D25K150 Resistor Dividohm 210 Series NOS
Ohmite D25K150 Resistor Dividohm 210 Series NOS
$5.99
quality
 lot of 5 OHMITE ADJUSTABLE RESISTOR RHS5KO 5000 ohms 25Watt NEW IN BOX
lot of 5 OHMITE ADJUSTABLE RESISTOR RHS5KO 5000 ohms 25Watt NEW IN BOX
$39.00
quality
10 Ohmite TUW10J3R0 Wire Wound Resistor 3 Ohm 10w 5 750v Lot of 10
10 Ohmite TUW10J3R0 Wire Wound Resistor 3 Ohm 10w 5 750v Lot of 10
$11.97
quality
5 pcs TA310PA100RJ Ohmite 10 Watt 100 Ohm 5 High Power Thick Film Resistor
5 pcs TA310PA100RJ Ohmite 10 Watt 100 Ohm 5 High Power Thick Film Resistor
$16.25
quality
10 pcs TA310PA15K0J Ohmite 10 Watt 15K Ohm 5 High PowerThick Film Resistor
10 pcs TA310PA15K0J Ohmite 10 Watt 15K Ohm 5 High PowerThick Film Resistor
$16.25
quality
5 pcs TA310PA250RJ Ohmite 10 Watt 250 Ohm 5 High Power Thick Film Resistor
5 pcs TA310PA250RJ Ohmite 10 Watt 250 Ohm 5 High Power Thick Film Resistor
$16.25
quality
5 pcs TA310PA30R0J Ohmite 10 Watt 30 Ohm 5 High Power Thick Film Resistor
5 pcs TA310PA30R0J Ohmite 10 Watt 30 Ohm 5 High Power Thick Film Resistor
$16.25
quality
5 pcs TA810PA160RJ Ohmite 10 Watt 160 Ohm 5 High Power Thick Film Resistor
5 pcs TA810PA160RJ Ohmite 10 Watt 160 Ohm 5 High Power Thick Film Resistor
$16.25
quality
5 pcs TA810PA1K00J Ohmite 10 Watt 1K Ohm 5 High Power Thick Film Resistor
5 pcs TA810PA1K00J Ohmite 10 Watt 1K Ohm 5 High Power Thick Film Resistor
$16.25
quality
3 pcs TA810PA1K50F Ohmite 10 Watt 15K Ohm 1 High PowerThick Film Resistor
3 pcs TA810PA1K50F Ohmite 10 Watt 15K Ohm 1 High PowerThick Film Resistor
$23.75
quality
5 pcs TA810PW100RJ Ohmite 10 Watt 100 Ohm 5 High Power Thick Film Resistor
5 pcs TA810PW100RJ Ohmite 10 Watt 100 Ohm 5 High Power Thick Film Resistor
$16.25
quality
5 pcs TA810PW24R0J Ohmite 10 Watt 24 Ohm 5 High Power Thick Film Resistor
5 pcs TA810PW24R0J Ohmite 10 Watt 24 Ohm 5 High Power Thick Film Resistor
$16.25
quality
5 pcs TA810PW33R0J Ohmite 10 Watt 33 Ohm 5 High Power Thick Film Resistor
5 pcs TA810PW33R0J Ohmite 10 Watt 33 Ohm 5 High Power Thick Film Resistor
$16.25
quality
5 pcs TA810PW3R90J Ohmite 10 Watt 39 Ohm 5 High Power Thick Film Resistor
5 pcs TA810PW3R90J Ohmite 10 Watt 39 Ohm 5 High Power Thick Film Resistor
$16.25
quality
5 pcs TA810PW510RJ Ohmite 10 Watt 510 Ohm 5 High Power Thick Film Resistor
5 pcs TA810PW510RJ Ohmite 10 Watt 510 Ohm 5 High Power Thick Film Resistor
$16.25
quality
5 pcs TA810PW5R60J Ohmite 10 Watt 56 Ohm 5 High Power Thick Film Resistor
5 pcs TA810PW5R60J Ohmite 10 Watt 56 Ohm 5 High Power Thick Film Resistor
$23.75
quality
Ohmite 1159 Resistor 175W 50 Ohm 210 175P 46 USED
Ohmite 1159 Resistor 175W 50 Ohm 210 175P 46 USED
$18.99
quality
Lot of 7 Ohmite Wirewound Resistors 250 40TE 528S 40R00J 9217
Lot of 7 Ohmite Wirewound Resistors 250 40TE 528S 40R00J 9217
$17.49
quality
Ohmite 0602 Resistor 100W 50 Ohm 270 100M 40 NEW
Ohmite 0602 Resistor 100W 50 Ohm 270 100M 40 NEW
$19.99
quality
Ohmite 2607 Resistor 300W 04 Ohm NEW
Ohmite 2607 Resistor 300W 04 Ohm NEW
$10.99
quality
Ohmite L100J2R0 100 Watt 2 Ohms Vitreous Enameled Resistor
Ohmite L100J2R0 100 Watt 2 Ohms Vitreous Enameled Resistor
$7.99
quality
AW120K Ohmite 25 Watt 12 Ohm 10 Ceramic Composition Resistor PulsEater
AW120K Ohmite 25 Watt 12 Ohm 10 Ceramic Composition Resistor PulsEater
$14.50
quality
5 pcs B20J30R Ohmite 20 Watt 30 Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs B20J30R Ohmite 20 Watt 30 Ohm 5 Wirewound Vitreous Enamel Resistor
$19.75
quality
C400K50R Ohmite 400 Watt 50 Ohm 10 Wirewound Vitreous Enamel Resistor
C400K50R Ohmite 400 Watt 50 Ohm 10 Wirewound Vitreous Enamel Resistor
$235.00
quality
AZ821K Ohmite 55 Watt 820 Ohm 10 Ceramic Composition Resistor PulsEater
AZ821K Ohmite 55 Watt 820 Ohm 10 Ceramic Composition Resistor PulsEater
$22.50
quality
5 pcs B5J75R Ohmite 5 Watt 75 Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs B5J75R Ohmite 5 Watt 75 Ohm 5 Wirewound Vitreous Enamel Resistor
$19.75
quality
AZ221K Ohmite 55 Watt 220 Ohm 10 Ceramic Composition Resistor PulsEater
AZ221K Ohmite 55 Watt 220 Ohm 10 Ceramic Composition Resistor PulsEater
$22.50
quality
C1000K10R Ohmite 1000 Watt 10 Ohm 10 Wirewound Vitreous Enamel Resistor
C1000K10R Ohmite 1000 Watt 10 Ohm 10 Wirewound Vitreous Enamel Resistor
$285.00
quality
C375K20R Ohmite 375 Watt 20 Ohm 10 Wirewound Vitreous Enamel Resistor
C375K20R Ohmite 375 Watt 20 Ohm 10 Wirewound Vitreous Enamel Resistor
$165.00
quality
C35KR08 Ohmite 35 Watt 008 Ohm 10 Wirewound Vitreous Enamel Resistor
C35KR08 Ohmite 35 Watt 008 Ohm 10 Wirewound Vitreous Enamel Resistor
$14.75
quality
5 pcs B8J450 Ohmite 8 Watt 450 Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs B8J450 Ohmite 8 Watt 450 Ohm 5 Wirewound Vitreous Enamel Resistor
$19.75
quality
5 pcs B8J900 Ohmite 8 Watt 900 Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs B8J900 Ohmite 8 Watt 900 Ohm 5 Wirewound Vitreous Enamel Resistor
$19.75
quality
5 pcs B5J3R0 Ohmite 5 Watt 3 Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs B5J3R0 Ohmite 5 Watt 3 Ohm 5 Wirewound Vitreous Enamel Resistor
$19.75
quality
5 pcs B12J600 Ohmite 12 Watt 600 Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs B12J600 Ohmite 12 Watt 600 Ohm 5 Wirewound Vitreous Enamel Resistor
$19.75
quality
C500K3R6 Ohmite 500 Watt 36 Ohm 10 Wirewound Vitreous Enamel Resistor
C500K3R6 Ohmite 500 Watt 36 Ohm 10 Wirewound Vitreous Enamel Resistor
$115.00
quality
5 pcs B8J600 Ohmite 8 Watt 600 Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs B8J600 Ohmite 8 Watt 600 Ohm 5 Wirewound Vitreous Enamel Resistor
$19.75
quality
5 pcs B12J12K Ohmite 12 Watt 12K Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs B12J12K Ohmite 12 Watt 12K Ohm 5 Wirewound Vitreous Enamel Resistor
$19.75
quality
5 pcs B5J200 Ohmite 5 Watt 200 Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs B5J200 Ohmite 5 Watt 200 Ohm 5 Wirewound Vitreous Enamel Resistor
$19.75
quality
5 pcs B8J2K0 Ohmite 8 Watt 2K Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs B8J2K0 Ohmite 8 Watt 2K Ohm 5 Wirewound Vitreous Enamel Resistor
$19.75
quality
C750K4R1 Ohmite 750 Watt 41 Ohm 10 Wirewound Vitreous Enamel Resistor
C750K4R1 Ohmite 750 Watt 41 Ohm 10 Wirewound Vitreous Enamel Resistor
$115.00
quality
5 pcsB20J10K2 Ohmite 20 Watt 102K Ohm 5 WirewoundVitreous EnamelResistor
5 pcsB20J10K2 Ohmite 20 Watt 102K Ohm 5 WirewoundVitreous EnamelResistor
$19.75
quality
5 pcs B8J1K25 Ohmite 8 Watt 125K Ohm 5 WirewoundVitreous EnamelResistor
5 pcs B8J1K25 Ohmite 8 Watt 125K Ohm 5 WirewoundVitreous EnamelResistor
$19.75
quality
AY390K Ohmite 45 Watt 39 Ohm 10 Ceramic Composition Resistor PulsEater
AY390K Ohmite 45 Watt 39 Ohm 10 Ceramic Composition Resistor PulsEater
$14.50
quality
5 pcs B20J650 Ohmite 20 Watt 650 Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs B20J650 Ohmite 20 Watt 650 Ohm 5 Wirewound Vitreous Enamel Resistor
$19.75
quality
C1500K5R0 Ohmite 1500 Watt 5 Ohm 10 Wirewound Vitreous Enamel Resistor
C1500K5R0 Ohmite 1500 Watt 5 Ohm 10 Wirewound Vitreous Enamel Resistor
$165.00
quality
AW560K Ohmite 25 Watt 56 Ohm 10 Ceramic Composition Resistor PulsEater
AW560K Ohmite 25 Watt 56 Ohm 10 Ceramic Composition Resistor PulsEater
$14.50
quality
C35KR15 Ohmite 35 Watt 015 Ohm 10 Wirewound Vitreous Enamel Resistor
C35KR15 Ohmite 35 Watt 015 Ohm 10 Wirewound Vitreous Enamel Resistor
$23.75
quality
C1500K23R Ohmite 1500 Watt 23 Ohm 10 Wirewound Vitreous Enamel Resistor
C1500K23R Ohmite 1500 Watt 23 Ohm 10 Wirewound Vitreous Enamel Resistor
$165.00
quality
AX220K Ohmite 35 Watt 22 Ohm 10 Ceramic Composition Resistor PulsEater
AX220K Ohmite 35 Watt 22 Ohm 10 Ceramic Composition Resistor PulsEater
$14.50
quality
C35KR04 Ohmite 35 Watt 004 Ohm 10 Wirewound Vitreous Enamel Resistor
C35KR04 Ohmite 35 Watt 004 Ohm 10 Wirewound Vitreous Enamel Resistor
$14.75
quality
AZ331K Ohmite 55 Watt 330 Ohm 10 Ceramic Composition Resistor PulsEater
AZ331K Ohmite 55 Watt 330 Ohm 10 Ceramic Composition Resistor PulsEater
$14.50
quality
AX102K Ohmite 35 Watt 1K Ohm 10 Ceramic Composition Resistor PulsEater
AX102K Ohmite 35 Watt 1K Ohm 10 Ceramic Composition Resistor PulsEater
$14.50
quality
AX330K Ohmite 35 Watt 33 Ohm 10 Ceramic Composition Resistor PulsEater
AX330K Ohmite 35 Watt 33 Ohm 10 Ceramic Composition Resistor PulsEater
$14.50
quality
5 pcs B12J900 Ohmite 12 Watt 900 Ohm 5 Wirewound Vitreous Enamel Resistor
5 pcs B12J900 Ohmite 12 Watt 900 Ohm 5 Wirewound Vitreous Enamel Resistor
$19.75
quality
Ohmite Resistor L50J10R 50W Chassy Mount 10 Ohms
Ohmite Resistor L50J10R 50W Chassy Mount 10 Ohms
$0.99
quality
Variable Resistor Ohmite 62204 300 300 ohm
Variable Resistor Ohmite 62204 300 300 ohm
$25.00
quality
Ohmite WFH160L2R0K 2 Ohm 160W Aluminum Housed Wirewound Power Resistor
Ohmite WFH160L2R0K 2 Ohm 160W Aluminum Housed Wirewound Power Resistor
$26.99
quality
OHMITE MOX91022505FTE 25M 25MEG OHM 38W 3W 1 PRECISION RESISTOR BOX55
OHMITE MOX91022505FTE 25M 25MEG OHM 38W 3W 1 PRECISION RESISTOR BOX55
$5.75
quality
54 Carbon Composition 68 Meg Ohm 10 1 Watt Vintage Resistors LK
54 Carbon Composition 68 Meg Ohm 10 1 Watt Vintage Resistors LK
$12.99
quality
31 Carbon Composition 560K Ohm 10 1 Watt Vintage Resistors LK
31 Carbon Composition 560K Ohm 10 1 Watt Vintage Resistors LK
$9.99
quality
34 Carbon Composition 82K Ohm 10 1 Watt Vintage Resistors LK
34 Carbon Composition 82K Ohm 10 1 Watt Vintage Resistors LK
$9.99
quality
46 Carbon Composition 390 K Ohm 10 1 Watt Vintage Resistors LK
46 Carbon Composition 390 K Ohm 10 1 Watt Vintage Resistors LK
$12.99
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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