Ohmite Resistors

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20 Ohmite 15FR100E 1 Ohms 1 Current Sense Resistors
20 Ohmite 15FR100E 1 Ohms 1 Current Sense Resistors
$24.99
quality
OHMITE 605HR030E RESISTOR CUR SENSE 500MW 0030HM 3 LOT OF 36 NIB
OHMITE 605HR030E RESISTOR CUR SENSE 500MW 0030HM 3 LOT OF 36 NIB
$19.99
quality
OHMITE PFE5K1R00E Wirewound Resistors Chassis Mount 1 Ohm 1089 WATTS 2 PCS
OHMITE PFE5K1R00E Wirewound Resistors Chassis Mount 1 Ohm 1089 WATTS 2 PCS
$100.00
quality
OHMITE 42J100 RESISTOR 100 0HMS 2 WATTS NNB
OHMITE 42J100 RESISTOR 100 0HMS 2 WATTS NNB
$1.45
quality
Ohmite 127 101 423 Resistor Assembly 127101423 270 100M 40 3K500J 3000 3000 Ohm
Ohmite 127 101 423 Resistor Assembly 127101423 270 100M 40 3K500J 3000 3000 Ohm
$21.00
quality
OHMITE 0579 DIVIDOHM ADJ WIREWOUND RESISTOR 75K OHM 7500 OHMS 50W W BRKT NNB
OHMITE 0579 DIVIDOHM ADJ WIREWOUND RESISTOR 75K OHM 7500 OHMS 50W W BRKT NNB
$13.97
quality
OHMITE 0580B DIVIDOHM ADJ WIREWOUND RESISTOR 9K OHM 9000 OHMS 50W W BRKT NIB
OHMITE 0580B DIVIDOHM ADJ WIREWOUND RESISTOR 9K OHM 9000 OHMS 50W W BRKT NIB
$14.97
quality
OHMITE 0580B DIVIDOHM ADJ WIREWOUND RESISTOR 9K OHM 9000 OHMS 50W W BRKT NNB
OHMITE 0580B DIVIDOHM ADJ WIREWOUND RESISTOR 9K OHM 9000 OHMS 50W W BRKT NNB
$13.97
quality
OHMITE 0580B DIVIDOHM ADJ WIREWOUND RESISTOR 9K OHM 9000 OHMS 50W W BRKT
OHMITE 0580B DIVIDOHM ADJ WIREWOUND RESISTOR 9K OHM 9000 OHMS 50W W BRKT
$6.97
quality
Ohmite 10K Ohm 3W 20AWG Passive Resistor 23J10KE
Ohmite 10K Ohm 3W 20AWG Passive Resistor 23J10KE
$2.00
quality
D175K1K0E OHMITE CHASSIS MOUNT WIREWOUND RESISTOR NEW IN BOX
D175K1K0E OHMITE CHASSIS MOUNT WIREWOUND RESISTOR NEW IN BOX
$19.99
quality
50 NOS OHMITE 2K 1 2wt 5 CARBON COMP RESISTORS FOR TUBE AMPLIFIER PARTS
50 NOS OHMITE 2K 1 2wt 5 CARBON COMP RESISTORS FOR TUBE AMPLIFIER PARTS
$15.00
quality
Pack of 10 Ohmite 85F3R32 Resistors 332 Ohm 5W NEW
Pack of 10 Ohmite 85F3R32 Resistors 332 Ohm 5W NEW
$9.99
quality
10 NOS OHMITE 2K 1 2 WATT 5 CARBON COMP RESISTORS FOR TUBE AMPLIFIER PARTS
10 NOS OHMITE 2K 1 2 WATT 5 CARBON COMP RESISTORS FOR TUBE AMPLIFIER PARTS
$8.00
quality
50 NOS OHMITE 56 MEG 1 2 WATT RC20 CARBON COMP RESISTORS TUBE AMPLIFIER PARTS
50 NOS OHMITE 56 MEG 1 2 WATT RC20 CARBON COMP RESISTORS TUBE AMPLIFIER PARTS
$12.95
quality
OHMITE D50K150 NEW RESISTOR D50K150
OHMITE D50K150 NEW RESISTOR D50K150
$10.00
quality
OHMITE 43F1R5E RESISTOR WIREWOUND 150HM 3W 1 RESISTANCE 15HM LOT OF 18NIB
OHMITE 43F1R5E RESISTOR WIREWOUND 150HM 3W 1 RESISTANCE 15HM LOT OF 18NIB
$21.99
quality
OHMITE 45F25R Silicone Ceramic Resistor 25 Ohm 5W 1 AXIAL NEW 5 PKG
OHMITE 45F25R Silicone Ceramic Resistor 25 Ohm 5W 1 AXIAL NEW 5 PKG
$3.99
quality
NIB OHMITE 1364 DIVIDOHM RESISTOR 225W 5000 OHMS
NIB OHMITE 1364 DIVIDOHM RESISTOR 225W 5000 OHMS
$20.95
quality
17 Ohmite Resistors 40FR10 10W 01 ohm Used WARRANTY
17 Ohmite Resistors 40FR10 10W 01 ohm Used WARRANTY
$16.50
quality
OHMITE L50J50K RESISTOR NEW L50J50K
OHMITE L50J50K RESISTOR NEW L50J50K
$14.95
quality
OHMITE L100J1R0 RESISTOR NEW
OHMITE L100J1R0 RESISTOR NEW
$11.95
quality
OHMITE RESISTOR L225J500 NEW L225J500
OHMITE RESISTOR L225J500 NEW L225J500
$13.95
quality
OHMITE RESISTOR L100J2R0 NEW L100J2R0
OHMITE RESISTOR L100J2R0 NEW L100J2R0
$11.95
quality
OHMITE L100J250 VITROUS ENAMELED RESISTOR 250 0HMS 100 WATTS NIB
OHMITE L100J250 VITROUS ENAMELED RESISTOR 250 0HMS 100 WATTS NIB
$8.50
quality
Lot of new OHMITE POWER RESISTORS INV2542
Lot of new OHMITE POWER RESISTORS INV2542
$9.99
quality
NEW Ohmite Planar Resistor TAP600K10R 10 Ohms 600W Chassis Mount
NEW Ohmite Planar Resistor TAP600K10R 10 Ohms 600W Chassis Mount
$17.95
quality
OHMITE D225K100 RESISTOR WIREWOUND 100 OHM 225W 10 7215
OHMITE D225K100 RESISTOR WIREWOUND 100 OHM 225W 10 7215
$14.99
quality
Ohmite Resistors 250 Ohm 100W P N L100J250
Ohmite Resistors 250 Ohm 100W P N L100J250
$8.50
quality
OHMITE Resistor 50 OHM 12W FIXED LUG  LEAD WIREWOUND 5 NEW 1 PKG
OHMITE Resistor 50 OHM 12W FIXED LUG LEAD WIREWOUND 5 NEW 1 PKG
$2.99
quality
OHMITE Vitreous Enamel Conformal Axial WW Resistor 1Ohm 3W 5 NEW 5 PKG
OHMITE Vitreous Enamel Conformal Axial WW Resistor 1Ohm 3W 5 NEW 5 PKG
$3.99
quality
400 NOS 1 WATT ALLEN BRADLEY STACKPOLE OHMITE TRW CARBON COMP RESISTORS
400 NOS 1 WATT ALLEN BRADLEY STACKPOLE OHMITE TRW CARBON COMP RESISTORS
$175.00
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 Vitreous Enamel Axial WW Resistor 1Ohm 3W 5 FORMED LEADS NEW 5 PKG
OHMITE Vitreous Enamel Axial WW Resistor 1Ohm 3W 5 FORMED LEADS NEW 5 PKG
$1.99
quality
Ohmite 270 100M 40 Resistor 2500 OHMS 270100M40
Ohmite 270 100M 40 Resistor 2500 OHMS 270100M40
$19.99
quality
OHMITE 0608 VITREOUS ENAMELED WIREWOUND RESISTOR 750 OHMS 100W W BRKT
OHMITE 0608 VITREOUS ENAMELED WIREWOUND RESISTOR 750 OHMS 100W W BRKT
$9.97
quality
OHMITE 0962B DIVIDOHM ADJ WIREWOUND RESISTOR 15K OHM 1500 OHMS 100W W BRKT NNB
OHMITE 0962B DIVIDOHM ADJ WIREWOUND RESISTOR 15K OHM 1500 OHMS 100W W BRKT NNB
$20.97
quality
OHMITE 0774B DIVIDOHM ADJ ENAMELED WIREWOUND RESISTOR 200 OHMS 75W W BRKT
OHMITE 0774B DIVIDOHM ADJ ENAMELED WIREWOUND RESISTOR 200 OHMS 75W W BRKT
$7.97
quality
OHMITE 0608 VITREOUS ENAMELED WIREWOUND RESISTOR 750 OHMS 100W W BRKT NIB
OHMITE 0608 VITREOUS ENAMELED WIREWOUND RESISTOR 750 OHMS 100W W BRKT NIB
$19.97
quality
50 OHMITE 43K 5 1 2W Carbon Composition Resistors
50 OHMITE 43K 5 1 2W Carbon Composition Resistors
$14.99
quality
1 NEW OHMITE D225K4R0 LUG RESISTOR NIB
1 NEW OHMITE D225K4R0 LUG RESISTOR NIB
$35.99
quality
5 Ohm 3W 1 Wirewound Power Resistor Current Shunt Max245 Amp 1ea New
5 Ohm 3W 1 Wirewound Power Resistor Current Shunt Max245 Amp 1ea New
$4.95
quality
1 NEW OHMITE L225J5R0 LUG RESISTOR NIB
1 NEW OHMITE L225J5R0 LUG RESISTOR NIB
$29.99
quality
Ohmite 2522 Resistor 12 OHM 300 Watt
Ohmite 2522 Resistor 12 OHM 300 Watt
$23.99
quality
1 NEW OHMITE L225J25R LUG RESISTOR NIB
1 NEW OHMITE L225J25R LUG RESISTOR NIB
$17.97
quality
Lot of Ohmite B8J100 Wirewound Resistors Qty 15
Lot of Ohmite B8J100 Wirewound Resistors Qty 15
$21.99
quality
10 Ohmite 1 Wire Wound Resistors 402 Ohms 5 Watts
10 Ohmite 1 Wire Wound Resistors 402 Ohms 5 Watts
$19.95
quality
LOT OF 4 OHMITE 850F15R RE75G150R0 WIREWOUND RESISTORS
LOT OF 4 OHMITE 850F15R RE75G150R0 WIREWOUND RESISTORS
$19.99
quality
OHMITE 825F75R 75 OHMS 75OHMS 20W 1 POWER RESISTOR NOS
OHMITE 825F75R 75 OHMS 75OHMS 20W 1 POWER RESISTOR NOS
$5.97
quality
2pcs Ohmite Wirewound Power Resistor 27 Ohm 11 Watt 5 90J27R
2pcs Ohmite Wirewound Power Resistor 27 Ohm 11 Watt 5 90J27R
$6.25
quality
4pcs Ohmite Wirewound Power Resistor 100 ohm 5 watt 5 95J100 100ohm 5watt
4pcs Ohmite Wirewound Power Resistor 100 ohm 5 watt 5 95J100 100ohm 5watt
$5.25
quality
25 Ohmite OY220KE 22 Ohm 2W 10 Fixed Ceramic Resistors
25 Ohmite OY220KE 22 Ohm 2W 10 Fixed Ceramic Resistors
$9.99
quality
Ohmite WFH160LR47KE 47 Ohm 160W Aluminum Housed Wirewound Power Resistor
Ohmite WFH160LR47KE 47 Ohm 160W Aluminum Housed Wirewound Power Resistor
$26.99
quality
Ohmite WFH160L2R0K 2 Ohm 160W Aluminum Housed Wirewound Power Resistor
Ohmite WFH160L2R0K 2 Ohm 160W Aluminum Housed Wirewound Power Resistor
$26.99
quality
Mil Spec Ohmite Resistors Part  54430 1 HE444 5005 0001 6300 Ohms
Mil Spec Ohmite Resistors Part 54430 1 HE444 5005 0001 6300 Ohms
$19.95
quality
30x Ohmite 45JR10 5W 1 Silicone Ceramic Conformal Axial Wirewound Resistor
30x Ohmite 45JR10 5W 1 Silicone Ceramic Conformal Axial Wirewound Resistor
$29.99
quality
Ohmite 95J10K Resistor 10K 5 Watt Lot of 3 NEW
Ohmite 95J10K Resistor 10K 5 Watt Lot of 3 NEW
$44.99
quality
8 Pcs Assorted 5  10 Watt Sprague KOOLOHM Ceramic Power Resistors 1 Ohmite
8 Pcs Assorted 5 10 Watt Sprague KOOLOHM Ceramic Power Resistors 1 Ohmite
$11.95
quality
LOT 2 NEW OHMITE ASSORTED D175K50R D225K25R 25 50OHMS 175 225W RESISTOR B215569
LOT 2 NEW OHMITE ASSORTED D175K50R D225K25R 25 50OHMS 175 225W RESISTOR B215569
$30.00
quality
Lot 3 Ohmite Tubular Wirewound Resistor L50J25R 25Ohm 50w Watt
Lot 3 Ohmite Tubular Wirewound Resistor L50J25R 25Ohm 50w Watt
$19.99
quality
Lot 3 Ohmite Tubular Wirewound Resistor L50J39R 39Ohm 5
Lot 3 Ohmite Tubular Wirewound Resistor L50J39R 39Ohm 5
$19.99
quality
5pcs 0499 OHM 3W 1 WIREWOUND RESISTOR OHMITE 83FR499
5pcs 0499 OHM 3W 1 WIREWOUND RESISTOR OHMITE 83FR499
$4.00
quality
10 pcs 40J5K0E OHMITE 5K Ohm 10W 5 AXIAL SILICONE CERAMIC WIREWOUND RESISTORS
10 pcs 40J5K0E OHMITE 5K Ohm 10W 5 AXIAL SILICONE CERAMIC WIREWOUND RESISTORS
$9.99
quality
Ohmite TUM5J 1KR Resistor Qty 5
Ohmite TUM5J 1KR Resistor Qty 5
$8.95
quality
Ohmite 100K  100W 5 Vitreous Enamel Power Resistor Lug Terminal
Ohmite 100K 100W 5 Vitreous Enamel Power Resistor Lug Terminal
$9.99
quality
OHMITE VITREOUS ENAMELED RESISTORS W BRACKETS 210 100M 40  100 W 8209 NEW
OHMITE VITREOUS ENAMELED RESISTORS W BRACKETS 210 100M 40 100 W 8209 NEW
$20.00
quality
Ohmite C300K6R3 Vitreous Enameled Resistor 300 Watts 63 OHMS
Ohmite C300K6R3 Vitreous Enameled Resistor 300 Watts 63 OHMS
$14.95
quality
15 ohm Ohmite resistor came off a Wilson 200 amp welder
15 ohm Ohmite resistor came off a Wilson 200 amp welder
$2.50
quality
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 0963 DIVIDOHM ADJ WIREWOUND RESISTOR 25K OHMS 2500 OHMS 100W W BRKT NIB
OHMITE 0963 DIVIDOHM ADJ WIREWOUND RESISTOR 25K OHMS 2500 OHMS 100W W BRKT NIB
$21.97
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 NIB
OHMITE 0964 DIVIDOHM ADJ WIREWOUND RESISTOR 5K OHMS 5000 OHMS 100W W BRKT NIB
$21.97
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
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 Powr rib Resistor PFE5K3R50
Ohmite Powr rib Resistor PFE5K3R50
$20.00
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 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 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
$16.00
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
OHMITE RESISTORS M270 2259 46 120 OHMS
OHMITE RESISTORS M270 2259 46 120 OHMS
$30.00
quality
OHMITE L100J2R0 RESISTOR NIB NOS Lot of 8
OHMITE L100J2R0 RESISTOR NIB NOS Lot of 8
$27.00
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
$13.00
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
$9.25
quality
Qty 10 Resistor 0200 Ohms 1 3W Ohmite 13FR200E
Qty 10 Resistor 0200 Ohms 1 3W Ohmite 13FR200E
$9.25
quality
Ohmite 90J10K Resistor Power 10K OHM 11W Lot of 4 NIB
Ohmite 90J10K Resistor Power 10K OHM 11W Lot of 4 NIB
$4.99
quality
Ohmite 0705 Wire Wound Resistor 150 OHM 175W NNB
Ohmite 0705 Wire Wound Resistor 150 OHM 175W NNB
$14.99
quality
Ohmite 7905 Wire Wound Resistor 5 OHM 225W USG
Ohmite 7905 Wire Wound Resistor 5 OHM 225W USG
$14.99
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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