Ohmite Resistors

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Ohmite L100J25RE Wirewound Resistor Chassis Mount 25ohm Through Hole 100 Watts
Ohmite L100J25RE Wirewound Resistor Chassis Mount 25ohm Through Hole 100 Watts
$14.95
quality
Ohmite 1718 Brown Devil Resistor 50 OHMS Lot of 4
Ohmite 1718 Brown Devil Resistor 50 OHMS Lot of 4
$12.00
quality
Lot 10 Ohmite Ceramic Radial Wirewound Resistors 5 Ohm 5W TWW5J5R0 Q8PWTMP00002
Lot 10 Ohmite Ceramic Radial Wirewound Resistors 5 Ohm 5W TWW5J5R0 Q8PWTMP00002
$7.99
quality
Ohmite LN100J200 Resistor 200 OHMS 100 Watts
Ohmite LN100J200 Resistor 200 OHMS 100 Watts
$16.00
quality
Ohmite F306 Resistor Number F306 10 Ohm X 15 NEW
Ohmite F306 Resistor Number F306 10 Ohm X 15 NEW
$9.95
quality
MOXG 013005J OHMITE 30 MEG OHM 40W 5 TUBULAR PRECISION POWER RESISTORS
MOXG 013005J OHMITE 30 MEG OHM 40W 5 TUBULAR PRECISION POWER RESISTORS
$59.99
quality
OHMITE RESISTOR Stock Number 2622 300 Watts 12 Ohms New In Box
OHMITE RESISTOR Stock Number 2622 300 Watts 12 Ohms New In Box
$16.95
quality
OHMITE FIXED RESISTOR 0901 Part Number 270 225P 46 300 Watts 25 Ohms New
OHMITE FIXED RESISTOR 0901 Part Number 270 225P 46 300 Watts 25 Ohms New
$16.95
quality
OHMITE C300K16R Wirewound Resistor Chassis Mount 300watt 16ohm NEW
OHMITE C300K16R Wirewound Resistor Chassis Mount 300watt 16ohm NEW
$22.95
quality
OHMITE E300K16R Wirewound Resistor Chassis Mount 300watt 16ohm NEW
OHMITE E300K16R Wirewound Resistor Chassis Mount 300watt 16ohm NEW
$22.95
quality
4  OHMITE RESISTORS L100J2K5  0612 100W 2500OHMS
4 OHMITE RESISTORS L100J2K5 0612 100W 2500OHMS
$32.00
quality
Ohmite 270 50K 40 Resistor No 0400C 25 50Watt 27050K40
Ohmite 270 50K 40 Resistor No 0400C 25 50Watt 27050K40
$7.99
quality
NEW OHMITE RESISTOR L50J75R 0400B FREE SHIPPING
NEW OHMITE RESISTOR L50J75R 0400B FREE SHIPPING
$9.91
quality
Ohmite 1156 A 1265 Amp Resistor
Ohmite 1156 A 1265 Amp Resistor
$19.99
quality
Ohmite Brown Devil 1844 Power Resistor 20K 20W
Ohmite Brown Devil 1844 Power Resistor 20K 20W
$7.99
quality
LOT OF 4 OHMITE  90J4R0 RESISTORS 4 OHMS 11W9331
LOT OF 4 OHMITE 90J4R0 RESISTORS 4 OHMS 11W9331
$9.50
quality
10 Ohmite Resistor 430K Ohm 2 Watt 5 Carbon Comp RC42GF434J
10 Ohmite Resistor 430K Ohm 2 Watt 5 Carbon Comp RC42GF434J
$7.84
quality
NEW NOT IN BOX OHMITE 271H 8HA 40 RESISTOR
NEW NOT IN BOX OHMITE 271H 8HA 40 RESISTOR
$6.99
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
OHMITE SPEC 58108 IC900 15 OHM 813 A CAGED RESISTORS
OHMITE SPEC 58108 IC900 15 OHM 813 A CAGED RESISTORS
$79.99
quality
OHMITE RESISTOR P N 850FR70 07 OHM 1 50W Metal Mite Chassis Mount Resistor
OHMITE RESISTOR P N 850FR70 07 OHM 1 50W Metal Mite Chassis Mount Resistor
$3.49
quality
Lot of 21 Ohmite Resistor Silicone Coated 45JR15 015 Ohm 5W8806
Lot of 21 Ohmite Resistor Silicone Coated 45JR15 015 Ohm 5W8806
$9.60
quality
Ohmite D100K10R No 0957 100W 8307 Resistor
Ohmite D100K10R No 0957 100W 8307 Resistor
$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
Ohmite D100K250 0960B 100W 8249 Resistor
Ohmite D100K250 0960B 100W 8249 Resistor
$24.99
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
Lot of 2 Ohmite Power Resistors 270225P46 1K Ohms 225W
Lot of 2 Ohmite Power Resistors 270225P46 1K Ohms 225W
$24.99
quality
Ohmite Power Resistor L100J10K 100 W 2845 kV 10K Ohms 5 Tolerance
Ohmite Power Resistor L100J10K 100 W 2845 kV 10K Ohms 5 Tolerance
$24.99
quality
Lot of 4 Ohmite Resistors L50J
Lot of 4 Ohmite Resistors L50J
$24.99
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
Ohmite D12K500 Resistor 12Watt 500 Ohm
Ohmite D12K500 Resistor 12Watt 500 Ohm
$8.79
quality
Box of 23 Ohmite B20J1K0 Axial Wirewound Power Resistors 20W 1K Ohms
Box of 23 Ohmite B20J1K0 Axial Wirewound Power Resistors 20W 1K Ohms
$30.00
quality
95J25R OHMITE MFG RESISTOR WIREWOUND 25 OHM 5W 5 AXIAL
95J25R OHMITE MFG RESISTOR WIREWOUND 25 OHM 5W 5 AXIAL
$1.73
quality
1x 2 Ohm 150W Rheostat Wirewound Resistor Potentiometer 150 Watt 2ohm Ohms
1x 2 Ohm 150W Rheostat Wirewound Resistor Potentiometer 150 Watt 2ohm Ohms
$49.00
quality
25 Ohm 75 Watt Tubular Ceramic Power Resistor 75W Ohmite 10 QTP
25 Ohm 75 Watt Tubular Ceramic Power Resistor 75W Ohmite 10 QTP
$15.00
quality
Ohmite D100K1K0 0962 100W 8308 Resistor
Ohmite D100K1K0 0962 100W 8308 Resistor
$24.99
quality
Ohmite D100K500 0961 100W 8243 Resistor
Ohmite D100K500 0961 100W 8243 Resistor
$24.99
quality
10 Ohmite Resistor 82Meg Ohm 1 Watt 10 Carbon Comp RC32GF825K
10 Ohmite Resistor 82Meg Ohm 1 Watt 10 Carbon Comp RC32GF825K
$6.61
quality
Ohmite D100K5R0 0956 100W 8304 Resistor
Ohmite D100K5R0 0956 100W 8304 Resistor
$24.99
quality
OHMITE L225J50R POWER LOG RESISTOR 225W 50OHMS LOT OF 5 FREE SHIPPING
OHMITE L225J50R POWER LOG RESISTOR 225W 50OHMS LOT OF 5 FREE SHIPPING
$90.00
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
$19.00
quality
GOOD NEW LOT OF 2 OHMITE RESISTORS E1000K1R2E 12OHM 10 NEW IN OHMITE BOX
GOOD NEW LOT OF 2 OHMITE RESISTORS E1000K1R2E 12OHM 10 NEW IN OHMITE BOX
$99.95
quality
OHMITE LITTLE DEVIL FIVE DRAWER RESISTOR ORGANIZER CABINET PRECISION
OHMITE LITTLE DEVIL FIVE DRAWER RESISTOR ORGANIZER CABINET PRECISION
$35.50
quality
GOOD NEW LOT OF 2 OHMITE RESISTORS C1500K8R8E 88OHM 10 NEW IN OHMITE BOX
GOOD NEW LOT OF 2 OHMITE RESISTORS C1500K8R8E 88OHM 10 NEW IN OHMITE BOX
$99.95
quality
GOOD NEW OHMITE RESISTOR E1000K70RE 70OHM 10 NEW IN OHMITE BOX
GOOD NEW OHMITE RESISTOR E1000K70RE 70OHM 10 NEW IN OHMITE BOX
$49.95
quality
Lot of 10 95J30R 4573 Ohmite 5w watt 30 Ohm Wire Wound Resistor MIL R 26 3449
Lot of 10 95J30R 4573 Ohmite 5w watt 30 Ohm Wire Wound Resistor MIL R 26 3449
$20.59
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
QTY 25 43F56R OHMITE 56 Ohm 3W 1 SILICONE CERAMIC WIREWOUND RESISTORS
QTY 25 43F56R OHMITE 56 Ohm 3W 1 SILICONE CERAMIC WIREWOUND RESISTORS
$8.99
quality
Ohmite OH8215 Carbon Resistor Axial 2 Watt 820 Ohm 5 Qty 10 NIB
Ohmite OH8215 Carbon Resistor Axial 2 Watt 820 Ohm 5 Qty 10 NIB
$7.50
quality
1 PC OHMITE L100J250 RESISTOR 250 ohm 100 watt Wire wound B4
1 PC OHMITE L100J250 RESISTOR 250 ohm 100 watt Wire wound B4
$7.00
quality
Ohmite M22 01 0001SB Rheostat Variable Resistor 1 125W 4 Amp Mil Spec w Hea
Ohmite M22 01 0001SB Rheostat Variable Resistor 1 125W 4 Amp Mil Spec w Hea
$34.08
quality
Ohmite C300K20R 20 Ohm 300 Watt Resistor
Ohmite C300K20R 20 Ohm 300 Watt Resistor
$9.99
quality
RESISTOR CARBON COMP 1 WATT VINTAGE A B PICKANY5VALUES NOS Qty25
RESISTOR CARBON COMP 1 WATT VINTAGE A B PICKANY5VALUES NOS Qty25
$20.95
quality
Lot of 50 Vintage 2 Watt Carbon Comp Resistors Tube Amp Allen Bradley Ohmite NOS
Lot of 50 Vintage 2 Watt Carbon Comp Resistors Tube Amp Allen Bradley Ohmite NOS
$24.95
quality
Ohmite L225J250 250 OHMS 5 Tubular Resistor NOS
Ohmite L225J250 250 OHMS 5 Tubular Resistor NOS
$24.99
quality
3 Vintage 1953 New Old Stock Ohmite Variable Resistor 250 OHMS
3 Vintage 1953 New Old Stock Ohmite Variable Resistor 250 OHMS
$10.00
quality
100  LOT of Carbon Composition Vintage Resistors Sprague Ohmite etc 1 LB
100 LOT of Carbon Composition Vintage Resistors Sprague Ohmite etc 1 LB
$4.50
quality
Ohmite Vitreous Enameled Resistor 25 Watt D25K200 200 OHM Used
Ohmite Vitreous Enameled Resistor 25 Watt D25K200 200 OHM Used
$7.20
quality
OHMITE RESISTOR 3 OHM 20 225 WATT
OHMITE RESISTOR 3 OHM 20 225 WATT
$14.95
quality
OHMITE RNS10RE RESISTOR 10 OHMS RHEOSTAT WIREWOUND RESISTOR 10  5477 AMP MAX
OHMITE RNS10RE RESISTOR 10 OHMS RHEOSTAT WIREWOUND RESISTOR 10 5477 AMP MAX
$54.99
quality
BRAND NEW OHMITE WIREWOUND RESISTOR 25W 3500OHMS MODEL L25J3K5 4 AVAILABLE
BRAND NEW OHMITE WIREWOUND RESISTOR 25W 3500OHMS MODEL L25J3K5 4 AVAILABLE
$19.99
quality
2 NEW 225 Watt 5 Ohm Ohmite D225K5R0 Vitreous Enameled Lug Resistor
2 NEW 225 Watt 5 Ohm Ohmite D225K5R0 Vitreous Enameled Lug Resistor
$17.37
quality
NEW IN BOX OHMITE L100J75R 100 WATTS 75 OHM RESISTOR
NEW IN BOX OHMITE L100J75R 100 WATTS 75 OHM RESISTOR
$7.99
quality
1 pc Ohmite Resistor IC9006A100G500EA 500 OHM 5 Used
1 pc Ohmite Resistor IC9006A100G500EA 500 OHM 5 Used
$25.00
quality
10 pcs 45J15R Ohmite 5 Watt 15 Ohm 5 Wirewound Silicone Coated Resistor
10 pcs 45J15R Ohmite 5 Watt 15 Ohm 5 Wirewound Silicone Coated Resistor
$12.75
quality
10 pcs 43J470 Ohmite 3 Watt 470 Ohm 5 Wirewound Silicone Coated Resistor
10 pcs 43J470 Ohmite 3 Watt 470 Ohm 5 Wirewound Silicone Coated Resistor
$12.75
quality
10 pcs OX123K Ohmite 1 Watt 12K Ohm 10 Ceramic Comp Resistor Axial
10 pcs OX123K Ohmite 1 Watt 12K Ohm 10 Ceramic Comp Resistor Axial
$12.75
quality
10 pcs OX393K Ohmite 1 Watt 39K Ohm 10 Ceramic Comp Resistor Axial
10 pcs OX393K Ohmite 1 Watt 39K Ohm 10 Ceramic Comp Resistor Axial
$12.75
quality
10 pcs 43J3K3 Ohmite 3 Watt 33K Ohm 5 Wirewound Silicone Coated Resistor
10 pcs 43J3K3 Ohmite 3 Watt 33K Ohm 5 Wirewound Silicone Coated Resistor
$12.75
quality
10 pcs 45J600 Ohmite 5 Watt 600 Ohm 5 Wirewound Silicone Coated Resistor
10 pcs 45J600 Ohmite 5 Watt 600 Ohm 5 Wirewound Silicone Coated Resistor
$12.75
quality
10 pcs OX391K Ohmite 1 Watt 390 Ohm 10 Ceramic Comp Resistor Axial
10 pcs OX391K Ohmite 1 Watt 390 Ohm 10 Ceramic Comp Resistor Axial
$12.75
quality
10 pcs 43F4K5 Ohmite 3 Watt 45K Ohm 1 Wirewound Silicone Coated Resistor
10 pcs 43F4K5 Ohmite 3 Watt 45K Ohm 1 Wirewound Silicone Coated Resistor
$16.75
quality
10 pcs OX681K Ohmite 1 Watt 680 Ohm 10 Ceramic Comp Resistor Axial
10 pcs OX681K Ohmite 1 Watt 680 Ohm 10 Ceramic Comp Resistor Axial
$12.75
quality
10 pcs 43J680 Ohmite 3 Watt 680 Ohm 5 Wirewound Silicone Coated Resistor
10 pcs 43J680 Ohmite 3 Watt 680 Ohm 5 Wirewound Silicone Coated Resistor
$12.75
quality
10 pcs 43F35R Ohmite 3 Watt 35 Ohm 1 Wirewound Silicone Coated Resistor
10 pcs 43F35R Ohmite 3 Watt 35 Ohm 1 Wirewound Silicone Coated Resistor
$12.75
quality
10 pcs 45FR249 Ohmite 5 Watt 0249 Ohm 1 WirewoundSilicone CoatedResistor
10 pcs 45FR249 Ohmite 5 Watt 0249 Ohm 1 WirewoundSilicone CoatedResistor
$12.75
quality
10 pcs OX822K Ohmite 1 Watt 82K Ohm 10 Ceramic Comp Resistor Axial
10 pcs OX822K Ohmite 1 Watt 82K Ohm 10 Ceramic Comp Resistor Axial
$12.75
quality
10 pcs 45FR15 Ohmite 5 Watt 015 Ohm 1 Wirewound Silicone Coated Resistor
10 pcs 45FR15 Ohmite 5 Watt 015 Ohm 1 Wirewound Silicone Coated Resistor
$12.75
quality
10 pcs 43F6K0 Ohmite 3 Watt 6K Ohm 1 Wirewound Silicone Coated Resistor
10 pcs 43F6K0 Ohmite 3 Watt 6K Ohm 1 Wirewound Silicone Coated Resistor
$16.75
quality
10 pcs 43J180 Ohmite 3 Watt 180 Ohm 5 Wirewound Silicone Coated Resistor
10 pcs 43J180 Ohmite 3 Watt 180 Ohm 5 Wirewound Silicone Coated Resistor
$12.75
quality
10 pcs OX183K Ohmite 1 Watt 18K Ohm 10 Ceramic Comp Resistor Axial
10 pcs OX183K Ohmite 1 Watt 18K Ohm 10 Ceramic Comp Resistor Axial
$12.75
quality
10 pcs 43J6K8 Ohmite 3 Watt 68K Ohm 5 Wirewound Silicone Coated Resistor
10 pcs 43J6K8 Ohmite 3 Watt 68K Ohm 5 Wirewound Silicone Coated Resistor
$12.75
quality
10 pcs 41F4R0 Ohmite 1 Watt 4 Ohm 1 Wirewound Silicone Coated Resistor
10 pcs 41F4R0 Ohmite 1 Watt 4 Ohm 1 Wirewound Silicone Coated Resistor
$16.75
quality
10 pcs 41F1R5 Ohmite 1 Watt 15 Ohm 1 Wirewound Silicone Coated Resistor
10 pcs 41F1R5 Ohmite 1 Watt 15 Ohm 1 Wirewound Silicone Coated Resistor
$16.75
quality
10 pcs 42J68R Ohmite 2 Watt 68 Ohm 5 Wirewound Silicone Coated Resistor
10 pcs 42J68R Ohmite 2 Watt 68 Ohm 5 Wirewound Silicone Coated Resistor
$16.75
quality
10 pcs 43F4K0 Ohmite 3 Watt 4K Ohm 1 Wirewound Silicone Coated Resistor
10 pcs 43F4K0 Ohmite 3 Watt 4K Ohm 1 Wirewound Silicone Coated Resistor
$16.75
quality
10 pcs 41JR15 Ohmite 1 Watt 015 Ohm 5 Wirewound Silicone Coated Resistor
10 pcs 41JR15 Ohmite 1 Watt 015 Ohm 5 Wirewound Silicone Coated Resistor
$16.75
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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