Ohmite Resistors

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OHMITE 0963 DIVIDOHM ADJ WIREWOUND RESISTOR 25K OHMS 2500 OHMS 100W W BRKT
OHMITE 0963 DIVIDOHM ADJ WIREWOUND RESISTOR 25K OHMS 2500 OHMS 100W W BRKT
$14.97
quality
OHMITE 0782B DIVIDOHM ADJ WIREWOUND RESISTOR 4K OHMS 4000 OHMS 75W W BRKT NIB
OHMITE 0782B DIVIDOHM ADJ WIREWOUND RESISTOR 4K OHMS 4000 OHMS 75W W BRKT NIB
$18.97
quality
OHMITE 0782B DIVIDOHM ADJ WIREWOUND RESISTOR 4K OHMS 4000 OHMS 75W W BRKT NNB
OHMITE 0782B DIVIDOHM ADJ WIREWOUND RESISTOR 4K OHMS 4000 OHMS 75W W BRKT NNB
$17.97
quality
OHMITE 0964 DIVIDOHM ADJ WIREWOUND RESISTOR 5K OHMS 5000 OHMS 100W W BRKT NNB
OHMITE 0964 DIVIDOHM ADJ WIREWOUND RESISTOR 5K OHMS 5000 OHMS 100W W BRKT NNB
$20.97
quality
NEW Ohmite D225K100E 100 Ohm Wirewound Wire Wound Resistor FREE SHIPPING
NEW Ohmite D225K100E 100 Ohm Wirewound Wire Wound Resistor FREE SHIPPING
$25.99
quality
7PA50 Ohmite Resistor Mount Kit 7PA 50 NOS
7PA50 Ohmite Resistor Mount Kit 7PA 50 NOS
$11.35
quality
Ohmite E300K4R0E 4 ohm 300w 10 Resistor
Ohmite E300K4R0E 4 ohm 300w 10 Resistor
$27.95
quality
OHMITE D25K3R0 Bracket Mount Resistor 3 OHM Variable Center Tap 25 WATT
OHMITE D25K3R0 Bracket Mount Resistor 3 OHM Variable Center Tap 25 WATT
$6.00
quality
Ohmite L225J5K0 5K Ohm 225W 5 Resistor
Ohmite L225J5K0 5K Ohm 225W 5 Resistor
$19.95
quality
Ohmite D175K25RE 25 Ohm 175W 10 Resistor accessory
Ohmite D175K25RE 25 Ohm 175W 10 Resistor accessory
$27.95
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
$10.99
quality
Ohmite E300K6R3 63 Ohm 300W 10 Resistor
Ohmite E300K6R3 63 Ohm 300W 10 Resistor
$27.95
quality
OHMITE 0783C DIVIDOHM ADJ WIREWOUND RESISTOR 7K OHMS 7000 OHMS 75W W BRKT NIB
OHMITE 0783C DIVIDOHM ADJ WIREWOUND RESISTOR 7K OHMS 7000 OHMS 75W W BRKT NIB
$18.97
quality
OHMITE 0783C DIVIDOHM ADJ WIREWOUND RESISTOR 7K OHMS 7000 OHMS 75W W BRKT NNB
OHMITE 0783C DIVIDOHM ADJ WIREWOUND RESISTOR 7K OHMS 7000 OHMS 75W W BRKT NNB
$17.97
quality
OHMITE 0783C DIVIDOHM ADJ WIREWOUND RESISTOR 7K OHMS 7000 OHMS 75W W BRKT
OHMITE 0783C DIVIDOHM ADJ WIREWOUND RESISTOR 7K OHMS 7000 OHMS 75W W BRKT
$11.97
quality
OHMITE 0966 DIVIDOHM ADJ WIREWOUND RESISTOR 15K OHMS 15000 OHMS 100W W BRKT NNB
OHMITE 0966 DIVIDOHM ADJ WIREWOUND RESISTOR 15K OHMS 15000 OHMS 100W W BRKT NNB
$20.97
quality
Ohmite C300K3R1 31 Ohm 300W 10 Resistor accessory
Ohmite C300K3R1 31 Ohm 300W 10 Resistor accessory
$21.95
quality
WARD LEONARD OHMITE ADJ RESISTOR  288A884EYP5 NSN 5905 00 927 2771
WARD LEONARD OHMITE ADJ RESISTOR 288A884EYP5 NSN 5905 00 927 2771
$1,150.00
quality
OHMITE RESISTOR 850F25R 25OHMS NEW
OHMITE RESISTOR 850F25R 25OHMS NEW
$5.00
quality
10 Ohmite R3J15R PC 58 Series 15 Ohm 3W 5 Vitreous Enamel Wirewound Resistors
10 Ohmite R3J15R PC 58 Series 15 Ohm 3W 5 Vitreous Enamel Wirewound Resistors
$19.99
quality
10 Ohmite Resistor 16K Ohm 2 Watt 5 Carbon Comp RC42GF163J
10 Ohmite Resistor 16K Ohm 2 Watt 5 Carbon Comp RC42GF163J
$8.57
quality
PACK OF 5 OHMITE 4766 90J39R 39 OHM WIREWOUND 11 WATT RESISTOR
PACK OF 5 OHMITE 4766 90J39R 39 OHM WIREWOUND 11 WATT RESISTOR
$9.00
quality
OHMITE 30 OHM RESISTOR 80025 455 01
OHMITE 30 OHM RESISTOR 80025 455 01
$15.00
quality
Qty 10 Resistor 0050 Ohms R05 1 3W Ohmite 13FR050E
Qty 10 Resistor 0050 Ohms R05 1 3W Ohmite 13FR050E
$6.01
quality
10 Ohmite Resistor 620K Ohm 2 Watt 5 Carbon Comp RC42GF624J
10 Ohmite Resistor 620K Ohm 2 Watt 5 Carbon Comp RC42GF624J
$8.97
quality
LOF OF 15 OHMITE P N L25J50R 50Ohms 23 Watt Resistors
LOF OF 15 OHMITE P N L25J50R 50Ohms 23 Watt Resistors
$59.95
quality
OHMITE RESISTOR L175J4R0 L175J4RO NEW
OHMITE RESISTOR L175J4R0 L175J4RO NEW
$15.00
quality
Ohmite Vitreous Enameled Resistors 100W 100Ohm L100J100 New In Box Lot Of 5
Ohmite Vitreous Enameled Resistors 100W 100Ohm L100J100 New In Box Lot Of 5
$39.95
quality
OHMITE 210 225P 46 Resistor Enamel Varible
OHMITE 210 225P 46 Resistor Enamel Varible
$23.00
quality
Ohmite L100J10R Wirewound Resistor 100W
Ohmite L100J10R Wirewound Resistor 100W
$14.95
quality
11 Ohmite 95J10R Power Wirewound Resistors
11 Ohmite 95J10R Power Wirewound Resistors
$8.99
quality
5 Ohmite 95J10R Power Wirewound Resistors
5 Ohmite 95J10R Power Wirewound Resistors
$5.99
quality
OHMITE RHS1K0 Rheostat Resistor
OHMITE RHS1K0 Rheostat Resistor
$29.99
quality
Ohmite 5 Ohm 90 Watt Power Resistor  496A740AD 5 23P010
Ohmite 5 Ohm 90 Watt Power Resistor 496A740AD 5 23P010
$14.95
quality
NEW 93J3R0 4342 Ohmite 3 1 4 w watt 3 Ohm Wire Wound Resistor RoHS MIL R 26
NEW 93J3R0 4342 Ohmite 3 1 4 w watt 3 Ohm Wire Wound Resistor RoHS MIL R 26
$1.77
quality
NEW 93J3R6 4344 Ohmite 3 1 4 w watt 36 Ohm Wire Wound Resistor RoHS MIL R 26
NEW 93J3R6 4344 Ohmite 3 1 4 w watt 36 Ohm Wire Wound Resistor RoHS MIL R 26
$1.77
quality
10 OHMITE 1 4W 470 OHM 5 RC07GF471J CARBON COMPOSITION RESISTOR
10 OHMITE 1 4W 470 OHM 5 RC07GF471J CARBON COMPOSITION RESISTOR
$5.95
quality
NEW 93J4R0 4346 Ohmite 3 1 4 w watt 4 Ohm Wire Wound Resistor RoHS MIL R 26
NEW 93J4R0 4346 Ohmite 3 1 4 w watt 4 Ohm Wire Wound Resistor RoHS MIL R 26
$1.77
quality
Lot of Ohmite D12K10R Wire Wound Resistor4
Lot of Ohmite D12K10R Wire Wound Resistor4
$24.99
quality
NEW 93J5R0 4349 Ohmite 3 1 4 w watt 5 Ohm Wire Wound Resistor RoHS MIL R 26
NEW 93J5R0 4349 Ohmite 3 1 4 w watt 5 Ohm Wire Wound Resistor RoHS MIL R 26
$1.77
quality
NEW 93J7R5 4356 Ohmite 3 1 4 w watt 75 Ohm Wire Wound Resistor RoHS MIL R 26
NEW 93J7R5 4356 Ohmite 3 1 4 w watt 75 Ohm Wire Wound Resistor RoHS MIL R 26
$1.77
quality
5 Ohmite 100 Ohm 1 2 Watt WireWound Resistor w Pre Soldered Lugs  SA6465 845
5 Ohmite 100 Ohm 1 2 Watt WireWound Resistor w Pre Soldered Lugs SA6465 845
$10.00
quality
1x RESISTOR 95J25K Resistor Wirewound 25K ohm 5W Axial
1x RESISTOR 95J25K Resistor Wirewound 25K ohm 5W Axial
$6.36
quality
2pcs OHMITE Wirewound Power Resistor 10K ohm 10watt 5
2pcs OHMITE Wirewound Power Resistor 10K ohm 10watt 5
$5.25
quality
NEW 93J15R 4365 Ohmite 3 1 4 w watt 15 Ohm Wire Wound Resistor RoHS MIL R 26
NEW 93J15R 4365 Ohmite 3 1 4 w watt 15 Ohm Wire Wound Resistor RoHS MIL R 26
$1.77
quality
Ohmite 0200R enameled resistor 25 watts 15 ohm NIB
Ohmite 0200R enameled resistor 25 watts 15 ohm NIB
$5.00
quality
OHMITE L100J1K0 RESISTOR 100W 1000 OHM
OHMITE L100J1K0 RESISTOR 100W 1000 OHM
$20.00
quality
Ohmite D75K50R 50ohm resistor
Ohmite D75K50R 50ohm resistor
$9.90
quality
NEW 93J20R 4368 Ohmite 3 1 4 w watt 20 Ohm Wire Wound Resistor RoHS MIL R 26
NEW 93J20R 4368 Ohmite 3 1 4 w watt 20 Ohm Wire Wound Resistor RoHS MIL R 26
$1.77
quality
NEW Ohmite E300K16R Bracket Mounted Wirewound Resistor 16 OHM 300 W 10
NEW Ohmite E300K16R Bracket Mounted Wirewound Resistor 16 OHM 300 W 10
$26.95
quality
NEW 93J50R 4380 Ohmite 3 1 4 w watt 50 Ohm Wire Wound Resistor RoHS MIL R 26
NEW 93J50R 4380 Ohmite 3 1 4 w watt 50 Ohm Wire Wound Resistor RoHS MIL R 26
$1.77
quality
NEW 93J56R 4382 Ohmite 3 1 4 w watt 56 Ohm Wire Wound Resistor RoHS MIL R 26
NEW 93J56R 4382 Ohmite 3 1 4 w watt 56 Ohm Wire Wound Resistor RoHS MIL R 26
$1.77
quality
NEW 93J68R 4385 Ohmite 3 1 4 w watt 68 Ohm Wire Wound Resistor RoHS MIL R 26
NEW 93J68R 4385 Ohmite 3 1 4 w watt 68 Ohm Wire Wound Resistor RoHS MIL R 26
$1.77
quality
NEW 93J100 4392 Ohmite 3 1 4 w watt 100 Ohm Wire Wound Resistor RoHS MIL R 26
NEW 93J100 4392 Ohmite 3 1 4 w watt 100 Ohm Wire Wound Resistor RoHS MIL R 26
$1.77
quality
Box of 25 Ohmite Axial Wirewound Resistors 12W 30K Ohms B12J30K USA Seller New
Box of 25 Ohmite Axial Wirewound Resistors 12W 30K Ohms B12J30K USA Seller New
$34.95
quality
Ohmite Wnd1R0Fet Through Hole Resistor pack of 10
Ohmite Wnd1R0Fet Through Hole Resistor pack of 10
$19.48
quality
Fixed Carbon ResistorOhmite51 5GreenBrownSilverGoldBlue5 Pcs
Fixed Carbon ResistorOhmite51 5GreenBrownSilverGoldBlue5 Pcs
$2.25
quality
NEW 93J390 4407 Ohmite 3 1 4 w watt 390 Ohm Wire Wound Resistor RoHS MIL R 26
NEW 93J390 4407 Ohmite 3 1 4 w watt 390 Ohm Wire Wound Resistor RoHS MIL R 26
$1.90
quality
NEW 93J400 4408 Ohmite 3 1 4 w watt 400 Ohm Wire Wound Resistor RoHS MIL R 26
NEW 93J400 4408 Ohmite 3 1 4 w watt 400 Ohm Wire Wound Resistor RoHS MIL R 26
$1.90
quality
NEW 93J450 4409A Ohmite 3 1 4 w watt 450 Ohm Wire Wound Resistor RoHS MIL R 26
NEW 93J450 4409A Ohmite 3 1 4 w watt 450 Ohm Wire Wound Resistor RoHS MIL R 26
$1.90
quality
NEW 93J430 4409 Ohmite 3 1 4 w watt 430 Ohm Wire Wound Resistor RoHS MIL R 26
NEW 93J430 4409 Ohmite 3 1 4 w watt 430 Ohm Wire Wound Resistor RoHS MIL R 26
$1.90
quality
NEW 93J620 4415 Ohmite 3 1 4 w watt 620 Ohm Wire Wound Resistor RoHS MIL R 26
NEW 93J620 4415 Ohmite 3 1 4 w watt 620 Ohm Wire Wound Resistor RoHS MIL R 26
$1.90
quality
NEW 93J1K8 4429 Ohmite 3 1 4 w watt 1800 18K Ohm Wire Wound Resistor MIL R 26
NEW 93J1K8 4429 Ohmite 3 1 4 w watt 1800 18K Ohm Wire Wound Resistor MIL R 26
$4.02
quality
Ohmite D175K2K5E 25K Ohm 175W Wirewound Vitreous Enamel RDL Lug BoltOn Resistor
Ohmite D175K2K5E 25K Ohm 175W Wirewound Vitreous Enamel RDL Lug BoltOn Resistor
$48.99
quality
5pc 93J39R Ohmite 39ohm 325W Wirewound Resistor FREE S H
5pc 93J39R Ohmite 39ohm 325W Wirewound Resistor FREE S H
$4.59
quality
VINTAGE RESISTOR LOT OHMITEVITROHMETC NEW OLD STOCK
VINTAGE RESISTOR LOT OHMITEVITROHMETC NEW OLD STOCK
$12.99
quality
OHMITE WARR 50 RESISTOR L50J10R NIB
OHMITE WARR 50 RESISTOR L50J10R NIB
$13.98
quality
Group of 5 NOS Ohmite Ceramic Power Resistors 1000ohm 50w
Group of 5 NOS Ohmite Ceramic Power Resistors 1000ohm 50w
$2.00
quality
NEW Ohmite Wirewound Ceramic Resistor B8J1R0 B8J1RO
NEW Ohmite Wirewound Ceramic Resistor B8J1R0 B8J1RO
$4.62
quality
NEW Ohmite Wirewound Ceramic Resistor B8J5RO B8J5R0
NEW Ohmite Wirewound Ceramic Resistor B8J5RO B8J5R0
$8.00
quality
NOS OHMITE 0907 L225J 225W 500 Ohm Wire Wound Vitreous Enamel Resistor New
NOS OHMITE 0907 L225J 225W 500 Ohm Wire Wound Vitreous Enamel Resistor New
$19.95
quality
NOS OHMITE 0916 L225J 225W 10K Ohm Wire Wound Vitreous Enamel Resistor New
NOS OHMITE 0916 L225J 225W 10K Ohm Wire Wound Vitreous Enamel Resistor New
$19.95
quality
OHMITE 1708 BROWN DEVIL 5 OHMS RESISTOR 10 W NNB
OHMITE 1708 BROWN DEVIL 5 OHMS RESISTOR 10 W NNB
$4.50
quality
OHMITE 995 3A RESISTOR 82 OHMS 3 WATTS NNB
OHMITE 995 3A RESISTOR 82 OHMS 3 WATTS NNB
$1.10
quality
New Ohmite Resistor L25J20K Free Shipping
New Ohmite Resistor L25J20K Free Shipping
$20.00
quality
Ohmite B12J125 125 Ohm 12W Brown Devil Vitreous Enamel Power Resistor NOS
Ohmite B12J125 125 Ohm 12W Brown Devil Vitreous Enamel Power Resistor NOS
$3.95
quality
OHMITE 42J220E RESISTOR 2200HM 2W 5 2PIN ELEMENT WIREWOUND LOT OF 18 NIB
OHMITE 42J220E RESISTOR 2200HM 2W 5 2PIN ELEMENT WIREWOUND LOT OF 18 NIB
$9.99
quality
OHMITE 0578B DIVIDOHM ADJ WIREWOUND RESISTOR 6K OHMS 6000 OHMS 50W W BRKT NNB
OHMITE 0578B DIVIDOHM ADJ WIREWOUND RESISTOR 6K OHMS 6000 OHMS 50W W BRKT NNB
$12.97
quality
OHMITE 0613 VITREOUS ENAMEL WIREWOUND RESISTOR 3K OHM 3000 OHMS 100W W BRKT NNB
OHMITE 0613 VITREOUS ENAMEL WIREWOUND RESISTOR 3K OHM 3000 OHMS 100W W BRKT NNB
$18.97
quality
OHMITE 0959 NEW RESISTOR 0959
OHMITE 0959 NEW RESISTOR 0959
$35.00
quality
NEW OHMITE DIVIDOHM  0365 RESISTOR 25 WATTS 25 OHMS
NEW OHMITE DIVIDOHM 0365 RESISTOR 25 WATTS 25 OHMS
$8.50
quality
OHMITE 25J560R VITREOUS ENAMEL WIREWOUND RESISTOR 5W 560ohms  LOT OF 16
OHMITE 25J560R VITREOUS ENAMEL WIREWOUND RESISTOR 5W 560ohms LOT OF 16
$17.99
quality
NEW LOT OF 2 OHMITE 1722 BROWN DEVIL 150 OHMS 5 RESISTOR 12 WATT B12J150 8612
NEW LOT OF 2 OHMITE 1722 BROWN DEVIL 150 OHMS 5 RESISTOR 12 WATT B12J150 8612
$6.00
quality
NEW LOT OF 3 OHMITE 1718 BROWN DEVIL 50 OHMS RESISTOR 12 WATT B12J 50R 8616
NEW LOT OF 3 OHMITE 1718 BROWN DEVIL 50 OHMS RESISTOR 12 WATT B12J 50R 8616
$10.00
quality
Ohmite 2 Ohm 25 Watt Resistor Stock No 0200K Vitreous Enamel New
Ohmite 2 Ohm 25 Watt Resistor Stock No 0200K Vitreous Enamel New
$7.00
quality
Ohmite 1 Ohm 25 Watt Resistor Stock No 0200J Vitreous Enamel New
Ohmite 1 Ohm 25 Watt Resistor Stock No 0200J Vitreous Enamel New
$7.25
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
$8.94
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
$11.56
quality
1106 9 OHMITE VARIABLE RESISTOR10 OHMS 274A DIA275 LENTH 175 NOS
1106 9 OHMITE VARIABLE RESISTOR10 OHMS 274A DIA275 LENTH 175 NOS
$20.00
quality
OHMITE RESISTOR D50K500
OHMITE RESISTOR D50K500
$10.00
quality
OHMITE RESISTOR D50K400
OHMITE RESISTOR D50K400
$10.00
quality
NEW 93J4K0 4439 Ohmite 3 1 4 w watt 4000 4K Ohm Wire Wound Resistor MIL R 26
NEW 93J4K0 4439 Ohmite 3 1 4 w watt 4000 4K Ohm Wire Wound Resistor MIL R 26
$4.02
quality
10 Ohmite 39 Meg Ohm 2 Watt 5 RC42GF395J Carbon Comp Resistor
10 Ohmite 39 Meg Ohm 2 Watt 5 RC42GF395J Carbon Comp Resistor
$7.88
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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