Ohmite Resistors

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OHMITE MOX91022505FTE 25M 25MEG OHM 38W 3W 1 PRECISION RESISTOR BOX55
OHMITE MOX91022505FTE 25M 25MEG OHM 38W 3W 1 PRECISION RESISTOR BOX55
$5.75
quality
54 Carbon Composition 68 Meg Ohm 10 1 Watt Vintage Resistors LK
54 Carbon Composition 68 Meg Ohm 10 1 Watt Vintage Resistors LK
$12.99
quality
31 Carbon Composition 560K Ohm 10 1 Watt Vintage Resistors LK
31 Carbon Composition 560K Ohm 10 1 Watt Vintage Resistors LK
$9.99
quality
34 Carbon Composition 82K Ohm 10 1 Watt Vintage Resistors LK
34 Carbon Composition 82K Ohm 10 1 Watt Vintage Resistors LK
$9.99
quality
46 Carbon Composition 390 K Ohm 10 1 Watt Vintage Resistors LK
46 Carbon Composition 390 K Ohm 10 1 Watt Vintage Resistors LK
$12.99
quality
NEW OHMITE D225K100 RESISTOR 225 WATTS 100 OHM 4426
NEW OHMITE D225K100 RESISTOR 225 WATTS 100 OHM 4426
$24.80
quality
Ohmite 225w watt 1K ohm Type 270 Vitreous Wire Wound Resistor L225J1K0 4446
Ohmite 225w watt 1K ohm Type 270 Vitreous Wire Wound Resistor L225J1K0 4446
$20.49
quality
59 Carbon Composition 56 K Ohm 10 1 Watt Vintage Resistors LK
59 Carbon Composition 56 K Ohm 10 1 Watt Vintage Resistors LK
$12.99
quality
22 Carbon Composition 56 Ohm 10 1 Watt Vintage Resistors LK
22 Carbon Composition 56 Ohm 10 1 Watt Vintage Resistors LK
$6.99
quality
10 Carbon Composition 22 Ohm 10 1 Watt Vintage Resistors LK
10 Carbon Composition 22 Ohm 10 1 Watt Vintage Resistors LK
$3.99
quality
45 Carbon Composition 12 Meg Ohm 10 1 Watt Vintage Resistors LK
45 Carbon Composition 12 Meg Ohm 10 1 Watt Vintage Resistors LK
$19.99
quality
64 Carbon Composition 27 Meg Ohm 10 1 Watt Vintage Resistors LK
64 Carbon Composition 27 Meg Ohm 10 1 Watt Vintage Resistors LK
$19.99
quality
49 Carbon Composition 56 Meg Ohm 10 1 Watt Vintage Resistors LK
49 Carbon Composition 56 Meg Ohm 10 1 Watt Vintage Resistors LK
$12.99
quality
30 Carbon Composition 69 Ohm 10 1 Watt Vintage Resistors LK
30 Carbon Composition 69 Ohm 10 1 Watt Vintage Resistors LK
$12.99
quality
12 Carbon Composition 390 Ohm 10 1 Watt Vintage Resistors LK
12 Carbon Composition 390 Ohm 10 1 Watt Vintage Resistors LK
$3.99
quality
47 Carbon Composition 33 Meg Ohm 10 1 Watt Vintage Resistors LK
47 Carbon Composition 33 Meg Ohm 10 1 Watt Vintage Resistors LK
$12.99
quality
OHMITE 15 Ohms 8 Watts Vitreous Enameled Resistors 1508 Pack of 10 Brown Devil
OHMITE 15 Ohms 8 Watts Vitreous Enameled Resistors 1508 Pack of 10 Brown Devil
$14.41
quality
25 Ohmite 43F20R 20Ohm 3W 1 Axial Silicone Ceramic Wirewound Power Resistors
25 Ohmite 43F20R 20Ohm 3W 1 Axial Silicone Ceramic Wirewound Power Resistors
$14.99
quality
OHMITE D225K500 LUG RESISTOR 225W 500 OHM NEW CONDITION IN BOX
OHMITE D225K500 LUG RESISTOR 225W 500 OHM NEW CONDITION IN BOX
$35.00
quality
6 Carbon Composition 39 Ohm 10 1 Watt Vintage Resistors LK
6 Carbon Composition 39 Ohm 10 1 Watt Vintage Resistors LK
$2.99
quality
45 Carbon Composition 27 K Ohm 10 1 Watt Vintage Resistors LK
45 Carbon Composition 27 K Ohm 10 1 Watt Vintage Resistors LK
$19.99
quality
OHMITE RESISTOR PART  RW37N5R3J RES 53 113W NOM
OHMITE RESISTOR PART RW37N5R3J RES 53 113W NOM
$57.50
quality
NEW Ohmite RE70GR10 010 Ohm 1 20 Watt Metal Power Resistor 20W MIL PRF 18546
NEW Ohmite RE70GR10 010 Ohm 1 20 Watt Metal Power Resistor 20W MIL PRF 18546
$3.49
quality
105 Carbon Composition 33 Ohm 10 1 Watt Vintage Resistors LK
105 Carbon Composition 33 Ohm 10 1 Watt Vintage Resistors LK
$39.99
quality
23 Carbon Composition 15 Ohm 10 1 Watt Vintage Resistors LK
23 Carbon Composition 15 Ohm 10 1 Watt Vintage Resistors LK
$9.99
quality
9 Carbon Composition 56 Ohm 10 1 Watt Vintage Resistors LK
9 Carbon Composition 56 Ohm 10 1 Watt Vintage Resistors LK
$3.99
quality
50 Carbon Composition 1800 Ohm 10 1 Watt Vintage Resistors LK
50 Carbon Composition 1800 Ohm 10 1 Watt Vintage Resistors LK
$12.99
quality
OHMITE ADJUSTABLE RESISTOR PART  D50K500 NSN 5905 00 265 1572
OHMITE ADJUSTABLE RESISTOR PART D50K500 NSN 5905 00 265 1572
$10.00
quality
OHMITE VARRIABLE RESISTOR PART  RHL500 NSN 5905 01 293 8344 25 WATT
OHMITE VARRIABLE RESISTOR PART RHL500 NSN 5905 01 293 8344 25 WATT
$25.00
quality
NEW ohmite 25 ohm power rib wire wound resistor
NEW ohmite 25 ohm power rib wire wound resistor
$50.00
quality
OHMITE L100J12K FIXED RESISTOR 12000 5 NEW
OHMITE L100J12K FIXED RESISTOR 12000 5 NEW
$6.95
quality
2 X 64K8288 Ohmite 25J250E Resistor Wirewound 250 Ohm 5W 5
2 X 64K8288 Ohmite 25J250E Resistor Wirewound 250 Ohm 5W 5
$20.55
quality
2 X 64K8958 Ohmite 43F500E Resistor Wirewound 500 Ohm 3W 1
2 X 64K8958 Ohmite 43F500E Resistor Wirewound 500 Ohm 3W 1
$20.38
quality
2 X 64K9119 Ohmite 45F330E Resistor Wirewound 330 Ohm 5W 1
2 X 64K9119 Ohmite 45F330E Resistor Wirewound 330 Ohm 5W 1
$20.50
quality
2 X 64K9116 Ohmite 45F30Re Resistor Wirewound 30 Ohm 5W 1
2 X 64K9116 Ohmite 45F30Re Resistor Wirewound 30 Ohm 5W 1
$20.52
quality
2 X 64K8230 Ohmite 23J600E Resistor Wirewound 600 Ohm 3W 5
2 X 64K8230 Ohmite 23J600E Resistor Wirewound 600 Ohm 3W 5
$20.47
quality
2 X 64K8194 Ohmite 23J220E Resistor Wirewound 220 Ohm 3W 5
2 X 64K8194 Ohmite 23J220E Resistor Wirewound 220 Ohm 3W 5
$20.47
quality
2 X 64K9071 Ohmite 45F1K0E Resistor Wirewound 1Kohm 5W 1
2 X 64K9071 Ohmite 45F1K0E Resistor Wirewound 1Kohm 5W 1
$20.67
quality
2 X 64K9103 Ohmite 45F220E Resistor Wirewound 220 Ohm 5W 1
2 X 64K9103 Ohmite 45F220E Resistor Wirewound 220 Ohm 5W 1
$20.50
quality
2 X 64K8206 Ohmite 23J300E Resistor Wirewound 300 Ohm 3W 5
2 X 64K8206 Ohmite 23J300E Resistor Wirewound 300 Ohm 3W 5
$20.41
quality
2 X 64K8840 Ohmite 42J100E Resistor Wirewound 100 Ohm 2W 5
2 X 64K8840 Ohmite 42J100E Resistor Wirewound 100 Ohm 2W 5
$21.22
quality
2 X 64K8859 Ohmite 42J25Re Resistor Wirewound 25 Ohm 2W 5
2 X 64K8859 Ohmite 42J25Re Resistor Wirewound 25 Ohm 2W 5
$21.28
quality
2 X 64K8177 Ohmite 23J100E Resistor Wirewound 100 Ohm 3W 5
2 X 64K8177 Ohmite 23J100E Resistor Wirewound 100 Ohm 3W 5
$20.41
quality
2 X 64K9073 Ohmite 45F1K2E Resistor Wirewound 12Kohm 5W 1
2 X 64K9073 Ohmite 45F1K2E Resistor Wirewound 12Kohm 5W 1
$20.67
quality
2 X 64K8197 Ohmite 23J250E Resistor Wirewound 250 Ohm 3W 5
2 X 64K8197 Ohmite 23J250E Resistor Wirewound 250 Ohm 3W 5
$20.41
quality
2 X 64K9174 Ohmite 45J100E Resistor Wirewound 100 Ohm 5W 5
2 X 64K9174 Ohmite 45J100E Resistor Wirewound 100 Ohm 5W 5
$20.41
quality
2 X 64K8193 Ohmite 23J22Re Resistor Wirewound 22 Ohm 3W 5
2 X 64K8193 Ohmite 23J22Re Resistor Wirewound 22 Ohm 3W 5
$20.50
quality
2 X 64K9107 Ohmite 45F250E Resistor Wirewound 250 Ohm 5W 1
2 X 64K9107 Ohmite 45F250E Resistor Wirewound 250 Ohm 5W 1
$20.50
quality
Ohmite 25K Ohms Wire Wound Resistor 20 Watt Vitreous Enamel NOS FREE SHIPPING
Ohmite 25K Ohms Wire Wound Resistor 20 Watt Vitreous Enamel NOS FREE SHIPPING
$7.95
quality
64K4927 Ohmite L225J100Ke Resistor Power 100Kohm 225W 5
64K4927 Ohmite L225J100Ke Resistor Power 100Kohm 225W 5
$37.12
quality
02F2341 Ohmite L100J150 Resistor Power 150 Ohm 100W 5
02F2341 Ohmite L100J150 Resistor Power 150 Ohm 100W 5
$30.07
quality
64K5007 Ohmite L50J200E Resistor Power 200 Ohm 50W 5
64K5007 Ohmite L50J200E Resistor Power 200 Ohm 50W 5
$25.81
quality
02F2337 Ohmite L100J25R Resistor Power 25 Ohm 100W 5
02F2337 Ohmite L100J25R Resistor Power 25 Ohm 100W 5
$30.32
quality
64K5013 Ohmite L50J3K0E Resistor Power 3Kohm 50W 5
64K5013 Ohmite L50J3K0E Resistor Power 3Kohm 50W 5
$25.74
quality
64K4955 Ohmite L25J10Ke Resistor Power 10Kohm 25W 5
64K4955 Ohmite L25J10Ke Resistor Power 10Kohm 25W 5
$23.92
quality
64K4968 Ohmite L25J25Re Resistor Power 25 Ohm 25W 5
64K4968 Ohmite L25J25Re Resistor Power 25 Ohm 25W 5
$23.20
quality
04F8920 Ohmite L50J20K Resistor Power 20Kohm 50W 5
04F8920 Ohmite L50J20K Resistor Power 20Kohm 50W 5
$24.14
quality
64K4586 Ohmite F55J50Re Resistor Power 50 Ohm 55W 5
64K4586 Ohmite F55J50Re Resistor Power 50 Ohm 55W 5
$30.47
quality
02F2287 Ohmite L25J250 Resistor Power 250 Ohm 25W 5
02F2287 Ohmite L25J250 Resistor Power 250 Ohm 25W 5
$22.66
quality
64K4226 Ohmite D175K100E Resistor Wirewound 100 Ohm 175W 10
64K4226 Ohmite D175K100E Resistor Wirewound 100 Ohm 175W 10
$45.18
quality
64K4926 Ohmite L225J100E Resistor Power 100 Ohm 225W 5
64K4926 Ohmite L225J100E Resistor Power 100 Ohm 225W 5
$35.20
quality
65K0075 Ohmite 850F5K0E Resistor Wirewound 5Kohm 50W 1
65K0075 Ohmite 850F5K0E Resistor Wirewound 5Kohm 50W 1
$24.36
quality
64K4995 Ohmite L50J10Re Resistor Power 10 Ohm 50W 5
64K4995 Ohmite L50J10Re Resistor Power 10 Ohm 50W 5
$27.06
quality
02F2314 Ohmite L50J100 Resistor Power 100 Ohm 50W 5
02F2314 Ohmite L50J100 Resistor Power 100 Ohm 50W 5
$26.37
quality
64K4959 Ohmite L25J12Ke Resistor Power 12Kohm 25W 5
64K4959 Ohmite L25J12Ke Resistor Power 12Kohm 25W 5
$26.14
quality
64K4285 Ohmite D25K20Re Resistor Wirewound 20 Ohm 25W 10
64K4285 Ohmite D25K20Re Resistor Wirewound 20 Ohm 25W 10
$27.71
quality
89F400 Ohmite 7Pa50 Thru Bolt 200 210 270 Resistor
89F400 Ohmite 7Pa50 Thru Bolt 200 210 270 Resistor
$25.34
quality
64K5010 Ohmite L50J25Re Resistor Power 25 Ohm 50W 5
64K5010 Ohmite L50J25Re Resistor Power 25 Ohm 50W 5
$25.16
quality
65K0058 Ohmite 850F1K5E Resistor Wirewound 15Kohm 50W 1
65K0058 Ohmite 850F1K5E Resistor Wirewound 15Kohm 50W 1
$25.39
quality
64K9431 Ohmite 7Pa160E Thru Bolt 200 210 270 Resistor
64K9431 Ohmite 7Pa160E Thru Bolt 200 210 270 Resistor
$30.25
quality
64K4811 Ohmite L100J100Ke Resistor Power 100Kohm 100W 5
64K4811 Ohmite L100J100Ke Resistor Power 100Kohm 100W 5
$32.60
quality
64K4924 Ohmite L225J10Ke Resistor Power 10Kohm 225W 5
64K4924 Ohmite L225J10Ke Resistor Power 10Kohm 225W 5
$34.56
quality
41M6590 Ohmite 40 70Mnj100Rde Resistor Wirewound 100 Ohm 40W 5
41M6590 Ohmite 40 70Mnj100Rde Resistor Wirewound 100 Ohm 40W 5
$28.13
quality
02F2338 Ohmite L100J50R Resistor Power 50 Ohm 100W 5
02F2338 Ohmite L100J50R Resistor Power 50 Ohm 100W 5
$28.67
quality
64K4957 Ohmite L25J100E Resistor Power 100 Ohm 25W 5
64K4957 Ohmite L25J100E Resistor Power 100 Ohm 25W 5
$22.35
quality
65K0572 Ohmite 95J10Ke Resistor Wirewound 10Kohm 5W 5
65K0572 Ohmite 95J10Ke Resistor Wirewound 10Kohm 5W 5
$23.36
quality
64K4996 Ohmite L50J100E Resistor Power 100 Ohm 50W 5
64K4996 Ohmite L50J100E Resistor Power 100 Ohm 50W 5
$25.16
quality
64K4978 Ohmite L25J5K0E Resistor Power 5Kohm 25W 5
64K4978 Ohmite L25J5K0E Resistor Power 5Kohm 25W 5
$23.09
quality
64K4565 Ohmite F55J10Re Resistor Power 10 Ohm 55W 5
64K4565 Ohmite F55J10Re Resistor Power 10 Ohm 55W 5
$30.90
quality
64K9434 Ohmite 7Pa25E Thru Bolt 200 210 270 Resistor
64K9434 Ohmite 7Pa25E Thru Bolt 200 210 270 Resistor
$24.10
quality
65K0071 Ohmite 850F25Re Resistor Wirewound 25 Ohm 50W 1
65K0071 Ohmite 850F25Re Resistor Wirewound 25 Ohm 50W 1
$23.72
quality
04F8805 Ohmite C300K20R Resistor Power 20 Ohm 300W 10
04F8805 Ohmite C300K20R Resistor Power 20 Ohm 300W 10
$40.47
quality
2 X 66K6789 Ohmite 12E 100 Mounting Bracket 210 270 Resistor
2 X 66K6789 Ohmite 12E 100 Mounting Bracket 210 270 Resistor
$20.59
quality
64K4830 Ohmite L100J500E Resistor Power 500 Ohm 100W 5
64K4830 Ohmite L100J500E Resistor Power 500 Ohm 100W 5
$29.20
quality
64K4936 Ohmite L225J250E Resistor Power 250 Ohm 225W 5
64K4936 Ohmite L225J250E Resistor Power 250 Ohm 225W 5
$34.49
quality
65K0088 Ohmite 90J1K0E Resistor Wirewound 1Kohm 11W 5
65K0088 Ohmite 90J1K0E Resistor Wirewound 1Kohm 11W 5
$23.06
quality
02F2336 Ohmite L100J10R Resistor Power 10 Ohm 100W 5
02F2336 Ohmite L100J10R Resistor Power 10 Ohm 100W 5
$28.67
quality
02F2356 Ohmite L225J25R Resistor Power 25 Ohm 225W 5
02F2356 Ohmite L225J25R Resistor Power 25 Ohm 225W 5
$38.07
quality
2 X 64K8232 Ohmite 23J68Re Resistor Wirewound 68 Ohm 3W 5
2 X 64K8232 Ohmite 23J68Re Resistor Wirewound 68 Ohm 3W 5
$20.50
quality
2 X Ohmite 9 Bracket Mounting Bracket For 200 210 270 Resistors
2 X Ohmite 9 Bracket Mounting Bracket For 200 210 270 Resistors
$19.94
quality
64K4343 Ohmite D50K50Re Resistor Wirewound 50 Ohm 50W 10
64K4343 Ohmite D50K50Re Resistor Wirewound 50 Ohm 50W 10
$32.55
quality
64K9430 Ohmite 7Pa100E Thru Bolt 200 210 270 Resistor
64K9430 Ohmite 7Pa100E Thru Bolt 200 210 270 Resistor
$25.62
quality
64K9751 Ohmite 825Fr10E Resistor Wirewound 01 Ohm 25W 1
64K9751 Ohmite 825Fr10E Resistor Wirewound 01 Ohm 25W 1
$23.94
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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