Ohmite Resistors

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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
NIB Ohmite Vitreous Enameled Resistor 50W 250 ohm D50K250 USA
NIB Ohmite Vitreous Enameled Resistor 50W 250 ohm D50K250 USA
$7.99
quality
NIB Ohmite Dividohm Resistor 100W 500 ohm D100K500 Wirewound
NIB Ohmite Dividohm Resistor 100W 500 ohm D100K500 Wirewound
$9.99
quality
OHMITE RESISTORS D100K100 2  3000
OHMITE RESISTORS D100K100 2 3000
$30.00
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
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
6 Ohmite L175J2R0 Vitreous Enamel 2 Ohm 175 Watt Power Resistors 270 series
6 Ohmite L175J2R0 Vitreous Enamel 2 Ohm 175 Watt Power Resistors 270 series
$29.00
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 0565 DIVIDOHM ADJ WIREWOUND RESISTOR 100 OHMS 50W W BRACKETS
OHMITE 0565 DIVIDOHM ADJ WIREWOUND RESISTOR 100 OHMS 50W W BRACKETS
$5.97
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 0796 DIVIDOHM ADJ WIREWOUND RESISTOR 100K OHMS 100000 OHMS 75W W BRKT NIB
OHMITE 0796 DIVIDOHM ADJ WIREWOUND RESISTOR 100K OHMS 100000 OHMS 75W W BRKT NIB
$18.97
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
20 ohm OHMITE Power Resistor 5 pack
20 ohm OHMITE Power Resistor 5 pack
$4.00
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
$9.50
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
OHMITE 90J20R 4768 VITREOUS ENAMEL WIREWOUND RESISTOR 11W 20ohm  LOT OF 5
OHMITE 90J20R 4768 VITREOUS ENAMEL WIREWOUND RESISTOR 11W 20ohm LOT OF 5
$12.99
quality
Ohmite Vitreous Enameled Resistor 0661 100J10K 100W 10K OHMS NEW
Ohmite Vitreous Enameled Resistor 0661 100J10K 100W 10K OHMS NEW
$29.00
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 OHMITE L225J50R 260 PPM C POWER 50OHM 225W RESISTOR B442077
NEW OHMITE L225J50R 260 PPM C POWER 50OHM 225W RESISTOR B442077
$16.18
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 Resistor 240W 27 Ohms New Old Surplus
OhMite Resistor 240W 27 Ohms New Old Surplus
$21.25
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
NIB OHMITE L225J10R RESISTOR 225W 10 OHM
NIB OHMITE L225J10R RESISTOR 225W 10 OHM
$21.95
quality
Ohmite PFE5K1R00 Power Rib Resistor New Surplus
Ohmite PFE5K1R00 Power Rib Resistor New Surplus
$131.75
quality
Ohmite PFE5K3R50 Power Rib Resistor New Surplus
Ohmite PFE5K3R50 Power Rib Resistor New Surplus
$131.75
quality
LOT 4 NEW OHMITE ASSORTED TYPE 270 FIXED RESISTOR 25OHM 50OHM 25W B442115
LOT 4 NEW OHMITE ASSORTED TYPE 270 FIXED RESISTOR 25OHM 50OHM 25W B442115
$16.18
quality
Ohmite PFE5K1R60 Power Rib Resistor New Surplus
Ohmite PFE5K1R60 Power Rib Resistor New Surplus
$131.75
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
$9.99
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
$12.99
quality
Ohmite 08X 5 39 59630 Power Rib Resistor New Surplus
Ohmite 08X 5 39 59630 Power Rib Resistor New Surplus
$131.75
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
NOS Box of Ten Ohmite Brown Devil 100 Ohm 20 Watt Resistors     r4
NOS Box of Ten Ohmite Brown Devil 100 Ohm 20 Watt Resistors r4
$19.95
quality
NEW OHMITE 20J20K RESISTOR 20000 OHM 10 WATT
NEW OHMITE 20J20K RESISTOR 20000 OHM 10 WATT
$5.99
quality
Ohmite Resistors 250 Ohm 100W P N L100J250
Ohmite Resistors 250 Ohm 100W P N L100J250
$9.99
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
$5.09
quality
LOT OF 3 Ohmite vitreous enameled resistor stock 0400L 50 watt 3 ohms L50J3R0
LOT OF 3 Ohmite vitreous enameled resistor stock 0400L 50 watt 3 ohms L50J3R0
$15.99
quality
27J8K2 OHMITE POWER WIREWOUND RESISTOR 7 WATTS 8200 OHMS AV 23A
27J8K2 OHMITE POWER WIREWOUND RESISTOR 7 WATTS 8200 OHMS AV 23A
$6.25
quality
NEW 93J4K7 4441 Ohmite 3 1 4 w watt 4700 47K Ohm Wire Wound Resistor MIL R 26
NEW 93J4K7 4441 Ohmite 3 1 4 w watt 4700 47K Ohm Wire Wound Resistor MIL R 26
$5.09
quality
NEW 93J5K0 4442 Ohmite 3 1 4 w watt 5000 5K Ohm Wire Wound Resistor MIL R 26
NEW 93J5K0 4442 Ohmite 3 1 4 w watt 5000 5K Ohm Wire Wound Resistor MIL R 26
$5.09
quality
NEW 93J5K6 4444 Ohmite 3 1 4 w watt 5600 56K Ohm Wire Wound Resistor MIL R 26
NEW 93J5K6 4444 Ohmite 3 1 4 w watt 5600 56K Ohm Wire Wound Resistor MIL R 26
$5.09
quality
NEW 93J6K2 4446 Ohmite 3 1 4 w watt 6200 62K Ohm Wire Wound Resistor MIL R 26
NEW 93J6K2 4446 Ohmite 3 1 4 w watt 6200 62K Ohm Wire Wound Resistor MIL R 26
$5.09
quality
NEW 93J7K0 4448 Ohmite 3 1 4 w watt 7000 7K Ohm Wire Wound Resistor MIL R 26
NEW 93J7K0 4448 Ohmite 3 1 4 w watt 7000 7K Ohm Wire Wound Resistor MIL R 26
$5.09
quality
NEW 93J7K5 4449 Ohmite 3 1 4 w watt 7500 75K Ohm Wire Wound Resistor MIL R 26
NEW 93J7K5 4449 Ohmite 3 1 4 w watt 7500 75K Ohm Wire Wound Resistor MIL R 26
$5.09
quality
NEW 93J9K0 4452 Ohmite 3 1 4 w watt 9000 9K Ohm Wire Wound Resistor MIL R 26
NEW 93J9K0 4452 Ohmite 3 1 4 w watt 9000 9K Ohm Wire Wound Resistor MIL R 26
$5.09
quality
NEW 93J30R 4373 Ohmite 3 1 4 w watt 30 Ohm Wire Wound Resistor RoHS MIL R 26
NEW 93J30R 4373 Ohmite 3 1 4 w watt 30 Ohm Wire Wound Resistor RoHS MIL R 26
$2.24
quality
Ohmite Resistor D25K25K Lot of 2 New
Ohmite Resistor D25K25K Lot of 2 New
$20.00
quality
Ohmite Resistor D25K2K5E Lot of 2 New
Ohmite Resistor D25K2K5E Lot of 2 New
$30.00
quality
LOT OF 5 OHMITE L100J50R 100W 50 OHM CERAMIC WIREWOUND RESISTOR
LOT OF 5 OHMITE L100J50R 100W 50 OHM CERAMIC WIREWOUND RESISTOR
$24.00
quality
Ohmite Rheostat Resistor Lot With Potentiometers Lot of 10 Various Sizes
Ohmite Rheostat Resistor Lot With Potentiometers Lot of 10 Various Sizes
$43.99
quality
QTY 180 L25J4K0E OHMITE CHASSIS MOUNT WIREWOUND RESISTORS 4K Ohm 25W 5 ROHS
QTY 180 L25J4K0E OHMITE CHASSIS MOUNT WIREWOUND RESISTORS 4K Ohm 25W 5 ROHS
$99.99
quality
OHMITE Resistor 12 OHM 12W FIXED LUG  LEAD WIREWOUND 5 NEW 1 PKG
OHMITE Resistor 12 OHM 12W FIXED LUG LEAD WIREWOUND 5 NEW 1 PKG
$2.99
quality
Ohmite Resistor 95J82R Lot of 10 New
Ohmite Resistor 95J82R Lot of 10 New
$12.00
quality
NEW 93J3K0 4435 Ohmite 3 1 4 w watt 3000 3K Ohm Wire Wound Resistor MIL R 26
NEW 93J3K0 4435 Ohmite 3 1 4 w watt 3000 3K Ohm Wire Wound Resistor MIL R 26
$5.09
quality
NEW 93J2K5 4433 Ohmite 3 1 4 w watt 2500 25K Ohm Wire Wound Resistor MIL R 26
NEW 93J2K5 4433 Ohmite 3 1 4 w watt 2500 25K Ohm Wire Wound Resistor MIL R 26
$5.09
quality
NEW 93J1K5 4427 Ohmite 3 1 4 w watt 1500 15K Ohm Wire Wound Resistor MIL R 26
NEW 93J1K5 4427 Ohmite 3 1 4 w watt 1500 15K Ohm Wire Wound Resistor MIL R 26
$5.09
quality
NEW 93J1K2 4425 Ohmite 3 1 4 w watt 1200 15K Ohm Wire Wound Resistor MIL R 26
NEW 93J1K2 4425 Ohmite 3 1 4 w watt 1200 15K Ohm Wire Wound Resistor MIL R 26
$5.09
quality
OHMITE VARIABLE RESISTOR 0655RNS7R5 75OHM 632AMP 300 WATT
OHMITE VARIABLE RESISTOR 0655RNS7R5 75OHM 632AMP 300 WATT
$60.00
quality
NEW 93J900 4421 Ohmite 3 1 4 w watt 900 Ohm Wire Wound Resistor MIL R 26
NEW 93J900 4421 Ohmite 3 1 4 w watt 900 Ohm Wire Wound Resistor MIL R 26
$2.40
quality
NEW 93J800 4419 Ohmite 3 1 4 w watt 800 Ohm Wire Wound Resistor MIL R 26
NEW 93J800 4419 Ohmite 3 1 4 w watt 800 Ohm Wire Wound Resistor MIL R 26
$2.40
quality
5PCS OHMITE SM108035004FE 5M OHM 25W 1 RADIAL FILM RESISTOR BOX78
5PCS OHMITE SM108035004FE 5M OHM 25W 1 RADIAL FILM RESISTOR BOX78
$4.95
quality
OHMITE VARIABLE RESISTOR  44968 5000 NSN 5905 00 921 4696
OHMITE VARIABLE RESISTOR 44968 5000 NSN 5905 00 921 4696
$25.00
quality
NEW 93J750 4418 Ohmite 3 1 4 w watt 750 Ohm Wire Wound Resistor MIL R 26
NEW 93J750 4418 Ohmite 3 1 4 w watt 750 Ohm Wire Wound Resistor MIL R 26
$2.40
quality
950 PIECES OHMITE WIREWOUND RESISTOR 2 OHM 10 WATT
950 PIECES OHMITE WIREWOUND RESISTOR 2 OHM 10 WATT
$250.00
quality
NEW 93J680 4416 Ohmite 3 1 4 w watt 680 Ohm Wire Wound Resistor MIL R 26
NEW 93J680 4416 Ohmite 3 1 4 w watt 680 Ohm Wire Wound Resistor MIL R 26
$2.40
quality
NEW 93J330 4405 Ohmite 3 1 4 w watt 330 Ohm Wire Wound Resistor MIL R 26
NEW 93J330 4405 Ohmite 3 1 4 w watt 330 Ohm Wire Wound Resistor MIL R 26
$2.40
quality
OHMITE L100J100E RESISTOR NEW OUT OF BOX
OHMITE L100J100E RESISTOR NEW OUT OF BOX
$15.00
quality
OHMITE B8J91R RESISTOR NEW OUT OF BOX
OHMITE B8J91R RESISTOR NEW OUT OF BOX
$20.00
quality
NEW 93J300 4404 Ohmite 3 1 4 w watt 300 Ohm Wire Wound Resistor MIL R 26
NEW 93J300 4404 Ohmite 3 1 4 w watt 300 Ohm Wire Wound Resistor MIL R 26
$2.40
quality
NEW 93J270 4403 Ohmite 3 1 4 w watt 270 Ohm Wire Wound Resistor MIL R 26
NEW 93J270 4403 Ohmite 3 1 4 w watt 270 Ohm Wire Wound Resistor MIL R 26
$2.40
quality
NEW 93J150 4396 Ohmite 3 1 4 w watt 150 Ohm Wire Wound Resistor MIL R 26
NEW 93J150 4396 Ohmite 3 1 4 w watt 150 Ohm Wire Wound Resistor MIL R 26
$2.40
quality
OHMITE 25w 5 Ohm 1 chassis mount resistor part 825F5R0
OHMITE 25w 5 Ohm 1 chassis mount resistor part 825F5R0
$5.25
quality
Ohmite 91J2R0 Wirewound Resistors 10 pack New
Ohmite 91J2R0 Wirewound Resistors 10 pack New
$34.99
quality
12231 New No Box Ohmite F20J75R Resistor Assembly 20Watt
12231 New No Box Ohmite F20J75R Resistor Assembly 20Watt
$16.05
quality
LOT 8 NEW OHMITE B12J900 900OHM 12W SER 200 RESISTOR D318052
LOT 8 NEW OHMITE B12J900 900OHM 12W SER 200 RESISTOR D318052
$10.23
quality
Ohmite Resistor stock 1364 d225k5ko
Ohmite Resistor stock 1364 d225k5ko
$12.95
quality
LOT OF 2 OHMITE RESISTOR 750HMS D75K750 NEW OUT OF BOX
LOT OF 2 OHMITE RESISTOR 750HMS D75K750 NEW OUT OF BOX
$25.00
quality
OHMITE N0663 RESISTOR NEW IN A BOX
OHMITE N0663 RESISTOR NEW IN A BOX
$90.00
quality
10 Ohmite Resistor 75K Ohm 2 Watts 5 RC42GF752J Carbon Comp
10 Ohmite Resistor 75K Ohm 2 Watts 5 RC42GF752J Carbon Comp
$5.60
quality
Ohmite TBH25P15R0JE RESISTOR 15 OHM 25W 5 TO220
Ohmite TBH25P15R0JE RESISTOR 15 OHM 25W 5 TO220
$4.00
quality
Bracket Mount Ohmite Resistor Powr rib Series 85 Ohms
Bracket Mount Ohmite Resistor Powr rib Series 85 Ohms
$45.00
quality
Ohmite 3406 Determ Ohm resistance box resistor NIST certified
Ohmite 3406 Determ Ohm resistance box resistor NIST certified
$84.96
quality
ohmite resistor  0372  25 watts  500 Ohms
ohmite resistor 0372 25 watts 500 Ohms
$1.00
quality
QTY 5 90J330 OHMITE AXIAL WIREWOUND RESISTORS 330 Ohm 11W 5 VITREOUS ENAMEL
QTY 5 90J330 OHMITE AXIAL WIREWOUND RESISTORS 330 Ohm 11W 5 VITREOUS ENAMEL
$7.99
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
NEW 93J120 4394 Ohmite 3 1 4 w watt 120 Ohm Wire Wound Resistor MIL R 26
NEW 93J120 4394 Ohmite 3 1 4 w watt 120 Ohm Wire Wound Resistor MIL R 26
$2.40
quality
NEW 93J2R4 4339 Ohmite 3 1 4 w watt 24 Ohm Wire Wound Resistor MIL R 26
NEW 93J2R4 4339 Ohmite 3 1 4 w watt 24 Ohm Wire Wound Resistor MIL R 26
$2.40
quality
32X Heico Ohmite Resistor Adjustable 12W 5 Ohm Inductive
32X Heico Ohmite Resistor Adjustable 12W 5 Ohm Inductive
$27.92
quality
OHMITE Vitreous Enameled Resistor 12 watt 3 ohm with variable center top NOS
OHMITE Vitreous Enameled Resistor 12 watt 3 ohm with variable center top NOS
$3.25
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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