Ohmite Resistors

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Vintage Ohmite enameled resistor Dividohm 100 Watt 1000 Ohms 0962 ST42
Vintage Ohmite enameled resistor Dividohm 100 Watt 1000 Ohms 0962 ST42
$19.99
quality
OHMITE RESISTORS L100J 50R NO0602 84 27
OHMITE RESISTORS L100J 50R NO0602 84 27
$16.00
quality
750 OHM 370 MA OHMITE RHEOSTAT VARIABLE RESISTOR 300 VOLTS
750 OHM 370 MA OHMITE RHEOSTAT VARIABLE RESISTOR 300 VOLTS
$14.99
quality
25 OHM 150 WATT 245 AMPS OHMITE RHEOSTAT VARIABLE RESISTOR NOS MODELL SERIES A
25 OHM 150 WATT 245 AMPS OHMITE RHEOSTAT VARIABLE RESISTOR NOS MODELL SERIES A
$27.99
quality
Ohmite SE 16302 160ohm amps 25 Rheostat Resistor 97E 2
Ohmite SE 16302 160ohm amps 25 Rheostat Resistor 97E 2
$59.99
quality
Ohmite Rheostat Resistor RNS10RE 300 Watts 10 OHM Wirewound Open Core
Ohmite Rheostat Resistor RNS10RE 300 Watts 10 OHM Wirewound Open Core
$77.99
quality
Box of 25 Ohmite Axial Wirewound Resistors 10W 22 Ohms 20J22R USA Seller New
Box of 25 Ohmite Axial Wirewound Resistors 10W 22 Ohms 20J22R USA Seller New
$34.95
quality
50 Ohmite RC20G245J 24 Meg 5 1 2W Carbon Comp Resistors
50 Ohmite RC20G245J 24 Meg 5 1 2W Carbon Comp Resistors
$21.99
quality
LOT 3 NEW OHMITE 1360B 210 225P 46 DIVIDOHM 225W 250OHM RESISTOR D341166
LOT 3 NEW OHMITE 1360B 210 225P 46 DIVIDOHM 225W 250OHM RESISTOR D341166
$27.00
quality
OHMITE 95J6K0 6K OHMS 5N WATT RESISTOR NNB
OHMITE 95J6K0 6K OHMS 5N WATT RESISTOR NNB
$1.25
quality
LOT 3 NEW OHMITE ASSORTED D225K100 L225J100 1360B LUG RESISTOR D341160
LOT 3 NEW OHMITE ASSORTED D225K100 L225J100 1360B LUG RESISTOR D341160
$42.00
quality
OHMITE LITTLE DEVILS 2 STORGAGE UNITS 20 TRAYS OF 500 CARBON FILM RESISTORS
OHMITE LITTLE DEVILS 2 STORGAGE UNITS 20 TRAYS OF 500 CARBON FILM RESISTORS
$89.99
quality
OHMITE 23J2R0 VITREOUS ENAMEL WIREWOUND RESISTOR 3W2R0
OHMITE 23J2R0 VITREOUS ENAMEL WIREWOUND RESISTOR 3W2R0
$8.00
quality
OHMITE 25J5R0 VITREOUS ENAMEL WIREWOUND RESISTOR 5W5R0 LOT OF 15
OHMITE 25J5R0 VITREOUS ENAMEL WIREWOUND RESISTOR 5W5R0 LOT OF 15
$13.50
quality
OHMITE RESISTOR TYPE 210 D25K5R0 5 OHM 25 WATTS  NIB NOS
OHMITE RESISTOR TYPE 210 D25K5R0 5 OHM 25 WATTS NIB NOS
$19.99
quality
OHMITE 25J15R VITREOUS ENAMEL WIREWOUND RESISTOR 5W 15ohms  LOT OF 8
OHMITE 25J15R VITREOUS ENAMEL WIREWOUND RESISTOR 5W 15ohms LOT OF 8
$10.80
quality
NEW LOT OF 5 OHMITE L25J15R RESISTORS 25W 15 OHMS
NEW LOT OF 5 OHMITE L25J15R RESISTORS 25W 15 OHMS
$25.00
quality
OHMITE RESISTOR 0200J 1 OHM 25 WATTS  NIB NOS
OHMITE RESISTOR 0200J 1 OHM 25 WATTS NIB NOS
$9.99
quality
50 OHM 50W W WATT OHMITE ADJ DIVIDOHM WIREWOUND POWER RESISTOR AC DC TEST LOAD
50 OHM 50W W WATT OHMITE ADJ DIVIDOHM WIREWOUND POWER RESISTOR AC DC TEST LOAD
$11.49
quality
OHMITE RESISTOR L50J1K0 1K OHM 50 WATTS  NIB NOS
OHMITE RESISTOR L50J1K0 1K OHM 50 WATTS NIB NOS
$14.99
quality
OHMITE L225J1K0 225W 1K OHMS TUBULAR RESISTOR 105 225watt 250ohm 5
OHMITE L225J1K0 225W 1K OHMS TUBULAR RESISTOR 105 225watt 250ohm 5
$20.00
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 45J56R SILICON CERAMIC WIREWOUND RESISTOR 5W 56  LOT OF 25
OHMITE 45J56R SILICON CERAMIC WIREWOUND RESISTOR 5W 56 LOT OF 25
$14.50
quality
Ohmite Resistor L50J5R0
Ohmite Resistor L50J5R0
$6.99
quality
Ohmite Vitreous Enameled Resistor L12J10K New
Ohmite Vitreous Enameled Resistor L12J10K New
$7.50
quality
Ohmite Resistor L12J82R
Ohmite Resistor L12J82R
$3.99
quality
NEW OHMITE DIVIDOHM 50 WATTS 4000 OHMS  0577 RESISTOR
NEW OHMITE DIVIDOHM 50 WATTS 4000 OHMS 0577 RESISTOR
$11.40
quality
Ohmite Resistor D12K3R0
Ohmite Resistor D12K3R0
$5.99
quality
OHMITE 95J56R 4582 VITREOUS ENAMEL WIREWOUND RESISTOR 5W 56  PACK OF 10
OHMITE 95J56R 4582 VITREOUS ENAMEL WIREWOUND RESISTOR 5W 56 PACK OF 10
$11.75
quality
Ohmite Resistor L12J27R
Ohmite Resistor L12J27R
$3.99
quality
Vintage Ceramic Wirewound Adjustable Tap Resistor Tube Ohmite Brown
Vintage Ceramic Wirewound Adjustable Tap Resistor Tube Ohmite Brown
$2.99
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 DIVIDOHM  0956 100 5 OHMS VAR RESISTOR NOS ORIGINAL BOX VTG
OHMITE DIVIDOHM 0956 100 5 OHMS VAR RESISTOR NOS ORIGINAL BOX VTG
$19.99
quality
Ohmite 430834 01 Variable Resistor RV4NAYSJ501A 500 Ohm NEW
Ohmite 430834 01 Variable Resistor RV4NAYSJ501A 500 Ohm NEW
$90.00
quality
New O S Ohmite vitreous enameled resistor stock  0400H 50 watt 200 ohms L50J200
New O S Ohmite vitreous enameled resistor stock 0400H 50 watt 200 ohms L50J200
$5.38
quality
LOT OF 10 NIB OHMITE TDH35PR200JE THICK FILM RESISTORS
LOT OF 10 NIB OHMITE TDH35PR200JE THICK FILM RESISTORS
$79.99
quality
OHMITE RESISTOR B20J250 QTY 3 3753A
OHMITE RESISTOR B20J250 QTY 3 3753A
$12.99
quality
New O S Ohmite vitreous enameled resistor 0962 100 watt 1K0 ohms D100K1K0
New O S Ohmite vitreous enameled resistor 0962 100 watt 1K0 ohms D100K1K0
$13.76
quality
OHMITE TYPE 210 25W 50OHM RESISTOR D25K50R QTY 8 NEW
OHMITE TYPE 210 25W 50OHM RESISTOR D25K50R QTY 8 NEW
$39.99
quality
Ohmite Little Devils Full of Resistors 2 5 Drawer Storage Cabinets Bakelite
Ohmite Little Devils Full of Resistors 2 5 Drawer Storage Cabinets Bakelite
$50.00
quality
New O S Ohmite vitreous enameled resistor stock no 0400L 50 watt 3 ohms L50J3R0
New O S Ohmite vitreous enameled resistor stock no 0400L 50 watt 3 ohms L50J3R0
$12.14
quality
Ohmite Ohm Ranger Stock 3420 Variable Resistor Test Box
Ohmite Ohm Ranger Stock 3420 Variable Resistor Test Box
$84.95
quality
OHMITE RESISTORS 3 OHM 5 WATT NOS LOT OF 5
OHMITE RESISTORS 3 OHM 5 WATT NOS LOT OF 5
$5.95
quality
OHMITE 1362 Resistor 225 Watts 1000 Ohms D225K1KO New Old Stock Made in USA
OHMITE 1362 Resistor 225 Watts 1000 Ohms D225K1KO New Old Stock Made in USA
$19.25
quality
30x Ohmite 45JR10 5W 1 Silicone Ceramic Conformal Axial Wirewound Resistor
30x Ohmite 45JR10 5W 1 Silicone Ceramic Conformal Axial Wirewound Resistor
$26.99
quality
OHMITE 0658 Wire wound Resistor W Hand wheel 25 ohm 35 Amp
OHMITE 0658 Wire wound Resistor W Hand wheel 25 ohm 35 Amp
$89.99
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
$169.00
quality
Three NIB Ohmite 25 Ohms 25 Watt Vitreous Enameled Resistor 270 25K 40 0200C
Three NIB Ohmite 25 Ohms 25 Watt Vitreous Enameled Resistor 270 25K 40 0200C
$11.39
quality
OHMITE RESISTOR  RW47V124 NSN 5905 00 836 6872 RES 120000 210W NOM
OHMITE RESISTOR RW47V124 NSN 5905 00 836 6872 RES 120000 210W NOM
$60.00
quality
OHMITE L100J50K RESISTOR POWER 50KOHM 100W 5
OHMITE L100J50K RESISTOR POWER 50KOHM 100W 5
$19.99
quality
LOT 2 NEW OHMITE L50J10R 50W 10OHMS VITREOUS ENAMELED RESISTOR D265805
LOT 2 NEW OHMITE L50J10R 50W 10OHMS VITREOUS ENAMELED RESISTOR D265805
$12.00
quality
OHMITE  RESISTOR  D100K50R  WATT 100 OHM 50      1013
OHMITE RESISTOR D100K50R WATT 100 OHM 50 1013
$20.00
quality
OHMITE RESISTOR L100J500 WATT 100 OHM 500      1013
OHMITE RESISTOR L100J500 WATT 100 OHM 500 1013
$20.00
quality
OHMITE RESISTOR  L100J50R   WATT 100 OHM 50     1013
OHMITE RESISTOR L100J50R WATT 100 OHM 50 1013
$20.00
quality
2 pcs 20J22R OHMITE AXIAL WIREWOUND RESISTORS 22 Ohm 10W 5 VITREOUS ENAMEL
2 pcs 20J22R OHMITE AXIAL WIREWOUND RESISTORS 22 Ohm 10W 5 VITREOUS ENAMEL
$5.99
quality
200 OHM 100WATT OHMITE 270 90M 40 5 WIREWOUND FIXED RESISTOR
200 OHM 100WATT OHMITE 270 90M 40 5 WIREWOUND FIXED RESISTOR
$10.00
quality
NEW OHMITE 31607 VARIABLE 1400OHM 042A AMP MAX RESISTOR D457645
NEW OHMITE 31607 VARIABLE 1400OHM 042A AMP MAX RESISTOR D457645
$65.00
quality
OHMITE Resistor P N 9607 100W 10 OHM UPC L100J10R NIB
OHMITE Resistor P N 9607 100W 10 OHM UPC L100J10R NIB
$8.99
quality
Ohmite L225J150 150 Ohm 225 Watt Resistor
Ohmite L225J150 150 Ohm 225 Watt Resistor
$29.93
quality
OHMITE NON IND VITREOUS ENAMELED RESISTORS LN100J5R0 NIB LOT OF 3
OHMITE NON IND VITREOUS ENAMELED RESISTORS LN100J5R0 NIB LOT OF 3
$29.99
quality
Ohmite No 0420 50K R 30 Resistor
Ohmite No 0420 50K R 30 Resistor
$14.97
quality
Ohmite 5 Ohms No 0400A Resistor
Ohmite 5 Ohms No 0400A Resistor
$22.97
quality
Ohmite HSN250 250 watt resistor
Ohmite HSN250 250 watt resistor
$50.00
quality
Ohmite Brown Devil No 1846 30K Ohms N 6 Resistor
Ohmite Brown Devil No 1846 30K Ohms N 6 Resistor
$9.97
quality
Lot Of 16 Ohmite RW67V472 4700 Omega 45J4K7 5W8506P Resistors
Lot Of 16 Ohmite RW67V472 4700 Omega 45J4K7 5W8506P Resistors
$39.97
quality
Ohmite Resistors 620HR005
Ohmite Resistors 620HR005
$6.95
quality
Ohmite L100J7K5 75K Omega Resistor
Ohmite L100J7K5 75K Omega Resistor
$24.97
quality
OHMITE SERIES 88 RESISTOR 392 0HMS 1
OHMITE SERIES 88 RESISTOR 392 0HMS 1
$1.00
quality
OHMITE LITTLE REBEL 3 STORGAGE UNITS 15 TRAYS 500 CARBON FILM RESISTORS
OHMITE LITTLE REBEL 3 STORGAGE UNITS 15 TRAYS 500 CARBON FILM RESISTORS
$69.99
quality
Ohmite Resistor 40J75R 10 watt 75 OHMS Qty 3 3770A
Ohmite Resistor 40J75R 10 watt 75 OHMS Qty 3 3770A
$4.35
quality
3 PCs OHMITE L25J4K0E RESISTOR POWER 4KOHM 25W 5
3 PCs OHMITE L25J4K0E RESISTOR POWER 4KOHM 25W 5
$7.99
quality
Ohmite Vitreous Enameled Resistor 0306 200 Watt 250 Ohms New Old Stock
Ohmite Vitreous Enameled Resistor 0306 200 Watt 250 Ohms New Old Stock
$20.00
quality
Ohmite Lug Resistor L175J5R0 175 Watt 5 Ohm
Ohmite Lug Resistor L175J5R0 175 Watt 5 Ohm
$17.00
quality
NEW NIB OHMITE D225K50R POWER RESISTOR 225W 50 OHMS 38
NEW NIB OHMITE D225K50R POWER RESISTOR 225W 50 OHMS 38
$20.00
quality
NEW NIB OHMITE DIVIDOHM 210 225P 46 POWER RESISTOR 225W 1500 OHMS 38
NEW NIB OHMITE DIVIDOHM 210 225P 46 POWER RESISTOR 225W 1500 OHMS 38
$20.00
quality
OHMITE DIVIDOHM 0383B RESISTOR VITREOUS ENAMELED 25W 7K OHM 25 WATT 7000 OHM
OHMITE DIVIDOHM 0383B RESISTOR VITREOUS ENAMELED 25W 7K OHM 25 WATT 7000 OHM
$5.00
quality
OHMITE DIVIDOHM 0370 RESISTOR VITREOUS ENAMELED 25W 200 OHM 25 WATT 5
OHMITE DIVIDOHM 0370 RESISTOR VITREOUS ENAMELED 25W 200 OHM 25 WATT 5
$5.00
quality
OHMITE 1542 BROWN DEVIL RESISTOR VITREOUS ENAMELED 35K OHMS 8 WATT 3500 OHM 5
OHMITE 1542 BROWN DEVIL RESISTOR VITREOUS ENAMELED 35K OHMS 8 WATT 3500 OHM 5
$2.00
quality
OHMITE DIVIDOHM D12K10R RESISTOR VITREOUS ENAMELED 12 W 150 OHM 12 WATT 5
OHMITE DIVIDOHM D12K10R RESISTOR VITREOUS ENAMELED 12 W 150 OHM 12 WATT 5
$5.00
quality
OHMITE DIVIDOHM 1031 RESISTOR VITREOUS ENAMELED 25W 4K OHM 25 WATT 4000 OHM
OHMITE DIVIDOHM 1031 RESISTOR VITREOUS ENAMELED 25W 4K OHM 25 WATT 4000 OHM
$5.00
quality
OHMITE DIVIDOHM 0389 RESISTOR VITREOUS ENAMELED 25W 8K OHM 12 WATT 8000 OHM 5
OHMITE DIVIDOHM 0389 RESISTOR VITREOUS ENAMELED 25W 8K OHM 12 WATT 8000 OHM 5
$5.00
quality
OHMITE DIVIDOHM RESISTOR W BRACKETS 25W 25K OHM 12 WATT 5
OHMITE DIVIDOHM RESISTOR W BRACKETS 25W 25K OHM 12 WATT 5
$5.00
quality
OHMITE DIVIDOHM RESISTOR VITREOUS ENAMELED W BRACKETS 12W 150 OHM 12 WATT 5
OHMITE DIVIDOHM RESISTOR VITREOUS ENAMELED W BRACKETS 12W 150 OHM 12 WATT 5
$5.00
quality
OHMITE DIVIDOHM D12K7RS RESISTOR VITREOUS ENAMELED 12W 75 OHM 12WATT 7500OHM 5
OHMITE DIVIDOHM D12K7RS RESISTOR VITREOUS ENAMELED 12W 75 OHM 12WATT 7500OHM 5
$5.00
quality
OHMITE DIVIDOHM D12K7R0 RESISTOR VITREOUS ENAMELED 12W 5 OHM 12 WATT 5
OHMITE DIVIDOHM D12K7R0 RESISTOR VITREOUS ENAMELED 12W 5 OHM 12 WATT 5
$5.00
quality
NEW IN BOX OHMITE ADJUSTABLE RESISTOR RH55KO 5 KO 25W MODEL HOHMS 5000 268 2
NEW IN BOX OHMITE ADJUSTABLE RESISTOR RH55KO 5 KO 25W MODEL HOHMS 5000 268 2
$18.00
quality
Ohmite 8 ohm 112 AMP 1000 Wattt Resistor 89C
Ohmite 8 ohm 112 AMP 1000 Wattt Resistor 89C
$99.99
quality
OHMITE D50K10R RESISTOR 50W 10 OHM NIB
OHMITE D50K10R RESISTOR 50W 10 OHM NIB
$4.99
quality
OHMITE L50J250KE Resistor Power 250K Ohm 250KOhm 250000 50W 5
OHMITE L50J250KE Resistor Power 250K Ohm 250KOhm 250000 50W 5
$29.95
quality
Lot Of 12 Ohmite 4848 7K Omega 995 10A 9683L Ceramic Resistors
Lot Of 12 Ohmite 4848 7K Omega 995 10A 9683L Ceramic Resistors
$39.97
quality
NEW IN BOX OHMITE P N 0206 FIXED RESISTOR 25 WATTS 1500 OHMS
NEW IN BOX OHMITE P N 0206 FIXED RESISTOR 25 WATTS 1500 OHMS
$9.85
quality
NEW IN BOX OHMITE DIVIDOHM P N 0585 RESISTOR 50 WATTS 25000 OHMS
NEW IN BOX OHMITE DIVIDOHM P N 0585 RESISTOR 50 WATTS 25000 OHMS
$12.99
quality
Ohmite 24000 Spec No 65770 9949 Resistor 88C
Ohmite 24000 Spec No 65770 9949 Resistor 88C
$169.99
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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