Ohmite Resistors

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OHMITE WIREWOUND RESISTOR D12K400 NIB
OHMITE WIREWOUND RESISTOR D12K400 NIB
$11.95
quality
OHMITE RESISTOR 12WATTS OHMS 300 D12K300 NIB
OHMITE RESISTOR 12WATTS OHMS 300 D12K300 NIB
$11.95
quality
10 Ohmite TK20P3R00JE 3 Ohm 20W TFilm Resistors TO 220
10 Ohmite TK20P3R00JE 3 Ohm 20W TFilm Resistors TO 220
$19.99
quality
OHMITE CORRIB RESISTOR 2614 20 20 OHMS
OHMITE CORRIB RESISTOR 2614 20 20 OHMS
$13.75
quality
Ohmite D100K2R0 Power resistor 0 to 2 ohm adjustable 100 Watt 0956B
Ohmite D100K2R0 Power resistor 0 to 2 ohm adjustable 100 Watt 0956B
$9.99
quality
Ohmite D100K5R0 Power resistor 0 to 5 ohm adjustable 100 Watt
Ohmite D100K5R0 Power resistor 0 to 5 ohm adjustable 100 Watt
$9.99
quality
NEW Ohmite 90 Series 95Jxxx Wire Wound 5w watt Resistor Ohm Selection MIL R 26
NEW Ohmite 90 Series 95Jxxx Wire Wound 5w watt Resistor Ohm Selection MIL R 26
$3.14
quality
Ohmite L25J1R0 25W Power Resistor 7086 55  Pack of 4
Ohmite L25J1R0 25W Power Resistor 7086 55 Pack of 4
$23.35
quality
Ohmite Resistor New in box  D225K500E 500 OHMS Tol 10 225W
Ohmite Resistor New in box D225K500E 500 OHMS Tol 10 225W
$18.95
quality
OHMITE L225J1RO RESISTOR 0726MEX NEW
OHMITE L225J1RO RESISTOR 0726MEX NEW
$40.01
quality
Ohmite B12J2K5 Wirewound Resistor 2500 Ohm 12 Watts NEW Free Shipping No 1744
Ohmite B12J2K5 Wirewound Resistor 2500 Ohm 12 Watts NEW Free Shipping No 1744
$6.75
quality
5pcs Ohmite Axial Wirewound Power Resistor 5 OHM 5 watt 5 150ppm C VC5E5
5pcs Ohmite Axial Wirewound Power Resistor 5 OHM 5 watt 5 150ppm C VC5E5
$5.75
quality
10  Resistors 5K Ohm 1 2 Watt 10 Carbon Comp Ohmite RC20GF502K 1 2W 5W
10 Resistors 5K Ohm 1 2 Watt 10 Carbon Comp Ohmite RC20GF502K 1 2W 5W
$6.18
quality
NIB OHMITE D225K3R0 LUG RESISTOR 225 WATT 3 OHMS
NIB OHMITE D225K3R0 LUG RESISTOR 225 WATT 3 OHMS
$36.00
quality
NEW OLD STOCK OHMITE 1000 OHM 316 AMP CERAMIC RESISTOR 0457
NEW OLD STOCK OHMITE 1000 OHM 316 AMP CERAMIC RESISTOR 0457
$39.95
quality
Ohmite 270 100M 40 2000 Ohm 100W Resistor
Ohmite 270 100M 40 2000 Ohm 100W Resistor
$8.00
quality
Ohmite C300K20R 300W 20 Ohm Resistor
Ohmite C300K20R 300W 20 Ohm Resistor
$8.00
quality
Ohmite L175J3K0 3000 Ohm Resistor
Ohmite L175J3K0 3000 Ohm Resistor
$8.00
quality
4pcs Ohmite Wirewound 50 Ohm 5 watt 30ppm C Vitreous Enamel Power Resistor
4pcs Ohmite Wirewound 50 Ohm 5 watt 30ppm C Vitreous Enamel Power Resistor
$6.25
quality
OHMITE RESISTOR  760E 2525 NSN 5905 01 011 6078  760E2525 2500 OHM 50W
OHMITE RESISTOR 760E 2525 NSN 5905 01 011 6078 760E2525 2500 OHM 50W
$650.00
quality
Lot of 17 Vintage Power Resistors NOS Ohm Watt
Lot of 17 Vintage Power Resistors NOS Ohm Watt
$21.68
quality
Lot 5 OHMITE L25J1R0E Resistor 1 OHM 25W 5 Lug Vitreous Enamel Power 270 Series
Lot 5 OHMITE L25J1R0E Resistor 1 OHM 25W 5 Lug Vitreous Enamel Power 270 Series
$24.87
quality
Ohmite Vitreous Enameled Resistor L100J10K New
Ohmite Vitreous Enameled Resistor L100J10K New
$20.00
quality
Ohmite Vitreous Enameled Resistor D100K10K New
Ohmite Vitreous Enameled Resistor D100K10K New
$17.00
quality
Ohmite Vitreous Enameled Resistor L12J560 New
Ohmite Vitreous Enameled Resistor L12J560 New
$7.00
quality
New Brand No64K3715 Ohmite B12J250E Wirewound Resistor 250 Ohm 12W 5 NOS
New Brand No64K3715 Ohmite B12J250E Wirewound Resistor 250 Ohm 12W 5 NOS
$17.00
quality
Ohmite Vitreous Enameled Resistor L12J100 New
Ohmite Vitreous Enameled Resistor L12J100 New
$7.00
quality
OHMITE 20J2K5 25K OHM 5 10W Wire Wound Axial Resistor New Lot Quantity 8
OHMITE 20J2K5 25K OHM 5 10W Wire Wound Axial Resistor New Lot Quantity 8
$11.50
quality
1500 ohms 300Watt Ohmite Single Turn Rheostat Wirewound Resistor 300W 1500Ohm
1500 ohms 300Watt Ohmite Single Turn Rheostat Wirewound Resistor 300W 1500Ohm
$124.00
quality
Ohmite Axial Resistor Series 90 Mounting Clips 5904 Pack of 10 pieces New
Ohmite Axial Resistor Series 90 Mounting Clips 5904 Pack of 10 pieces New
$16.09
quality
OHMITE OK2045 200K Ohm 1 4W 5 Carbon Film Resistor NEW 100 PKG
OHMITE OK2045 200K Ohm 1 4W 5 Carbon Film Resistor NEW 100 PKG
$4.99
quality
1 Ohmite D225K25R 25 Ohm 225W 10 Dividohm Adjustable Wirewound Resistor
1 Ohmite D225K25R 25 Ohm 225W 10 Dividohm Adjustable Wirewound Resistor
$22.99
quality
1 Ohmite D225K100 100 Ohm 225W 10 Dividohm Adjustable Wirewound Resistor
1 Ohmite D225K100 100 Ohm 225W 10 Dividohm Adjustable Wirewound Resistor
$22.99
quality
Ohmite 1003 12W 30Ohm Ceramic Resistor New
Ohmite 1003 12W 30Ohm Ceramic Resistor New
$4.99
quality
Ohmite 0364B 25W 20 Ohm Ceramic Resistor New
Ohmite 0364B 25W 20 Ohm Ceramic Resistor New
$5.99
quality
Ohmite Resistor L100J100 100 Watt 100 Ohm NEW
Ohmite Resistor L100J100 100 Watt 100 Ohm NEW
$10.99
quality
Ohmite Axial Resistor Series 90 Mounting Clips 5904 Pack of 50 pieces New
Ohmite Axial Resistor Series 90 Mounting Clips 5904 Pack of 50 pieces New
$44.89
quality
Ohmite 93J10R 325 Watts 10 OHMS Wirewound Resistors Pkg 25 New
Ohmite 93J10R 325 Watts 10 OHMS Wirewound Resistors Pkg 25 New
$34.99
quality
Ohmite 850F50RE Resistor 50W 50 Ohm 1 USED
Ohmite 850F50RE Resistor 50W 50 Ohm 1 USED
$5.99
quality
Ohmite D50K5R0 Wirewound Power Resistor Enamel 50W 5ohms NEW
Ohmite D50K5R0 Wirewound Power Resistor Enamel 50W 5ohms NEW
$19.99
quality
Ohmite L50J250 Resistor 50W 250 Ohm NEW
Ohmite L50J250 Resistor 50W 250 Ohm NEW
$12.99
quality
Ohmite 0200E 75 Ohms Resistor Vitreous Enameled 25 Watts New
Ohmite 0200E 75 Ohms Resistor Vitreous Enameled 25 Watts New
$7.50
quality
Ohmite 0201 250 Ohms Resistor Vitreous Enameled 25 Watts New
Ohmite 0201 250 Ohms Resistor Vitreous Enameled 25 Watts New
$7.50
quality
Ohmite 0202 500 Ohms Resistor Vitreous Enameled 25 Watts New
Ohmite 0202 500 Ohms Resistor Vitreous Enameled 25 Watts New
$7.50
quality
Ohmite 0205 1000 Ohms Resistor Vitreous Enameled 25 Watts New
Ohmite 0205 1000 Ohms Resistor Vitreous Enameled 25 Watts New
$7.50
quality
Ohmite 0214 7500 Ohms Resistor Vitreous Enameled 25 Watts New
Ohmite 0214 7500 Ohms Resistor Vitreous Enameled 25 Watts New
$7.50
quality
Ohmite 0216 12K 12000 Ohms Resistor Vitreous Enameled 25 Watts New
Ohmite 0216 12K 12000 Ohms Resistor Vitreous Enameled 25 Watts New
$7.50
quality
Ohmite 0401 250 Ohms Resistor Vitreous Enameled 50 Watts New
Ohmite 0401 250 Ohms Resistor Vitreous Enameled 50 Watts New
$7.50
quality
NOS NIB Ohmite Vitreous Enameled 3 100 Watt Resistor w Hardware 10 Available
NOS NIB Ohmite Vitreous Enameled 3 100 Watt Resistor w Hardware 10 Available
$10.00
quality
Ohmite 76407 10RE Resistor 1000W 10 Ohms New Old Stock
Ohmite 76407 10RE Resistor 1000W 10 Ohms New Old Stock
$49.99
quality
OHMITE 270 225P 46 ENAMEL RESISTOR 250 OHMS S 52 225 WATTS
OHMITE 270 225P 46 ENAMEL RESISTOR 250 OHMS S 52 225 WATTS
$9.99
quality
OHMITE RESISTOR LOT OF 7 RESISTORS M 76 0205 1000 OHMS
OHMITE RESISTOR LOT OF 7 RESISTORS M 76 0205 1000 OHMS
$9.99
quality
Ohmiteadjustable tapped tubular resistor 0118 66008 150ohm 10 225 watt
Ohmiteadjustable tapped tubular resistor 0118 66008 150ohm 10 225 watt
$4.00
quality
Ohmite 2405 Vitreous Enameled Resistor 175W 100 ohms
Ohmite 2405 Vitreous Enameled Resistor 175W 100 ohms
$9.99
quality
QTY 25 95J16KE OHMITE VITREOUS ENAMEL WIREWOUND RESISTORS 16K Ohm 5W 5 ROHS
QTY 25 95J16KE OHMITE VITREOUS ENAMEL WIREWOUND RESISTORS 16K Ohm 5W 5 ROHS
$19.99
quality
NEW IN BOX OHMITE DIVIDOHM RESISTOR 1040 12 W 10000 OHM
NEW IN BOX OHMITE DIVIDOHM RESISTOR 1040 12 W 10000 OHM
$5.95
quality
NEW IN BOX OHMITE DIVIDOHM RESISTOR 0784B 75 W 8000 OHM
NEW IN BOX OHMITE DIVIDOHM RESISTOR 0784B 75 W 8000 OHM
$5.99
quality
New Brand No64K3967 Ohmite B8J500E Wirewound Resistor 500 Ohm 8W 5
New Brand No64K3967 Ohmite B8J500E Wirewound Resistor 500 Ohm 8W 5
$20.00
quality
New Brand No64K7994 Ohmite 20J30Ke Wirewound Resistor 30Kohm 10W 5
New Brand No64K7994 Ohmite 20J30Ke Wirewound Resistor 30Kohm 10W 5
$18.81
quality
New Brand No64K8008 Ohmite 20J50Ke Wirewound Resistor 50Kohm 10W 5
New Brand No64K8008 Ohmite 20J50Ke Wirewound Resistor 50Kohm 10W 5
$18.81
quality
New Brand No64K8023 Ohmite 21J1K5E Wirewound Resistor 15Kohm 1W 5
New Brand No64K8023 Ohmite 21J1K5E Wirewound Resistor 15Kohm 1W 5
$19.90
quality
New Brand No64K8026 Ohmite 21J100E Wirewound Resistor 100 Ohm 1W 5
New Brand No64K8026 Ohmite 21J100E Wirewound Resistor 100 Ohm 1W 5
$18.67
quality
New Brand No65K0606 Ohmite 95J200E Wirewound Resistor 200 Ohm 5W 5
New Brand No65K0606 Ohmite 95J200E Wirewound Resistor 200 Ohm 5W 5
$17.45
quality
New Brand No64K9631 Ohmite 805F150E Wirewound Resistor 150 Ohm 5W 1
New Brand No64K9631 Ohmite 805F150E Wirewound Resistor 150 Ohm 5W 1
$20.56
quality
New Brand No64K3693 Ohmite B12J12Ke Wirewound Resistor 12Kohm 12W 5
New Brand No64K3693 Ohmite B12J12Ke Wirewound Resistor 12Kohm 12W 5
$20.21
quality
New Brand No64K4821 Ohmite L100J250E Resistor Power 250 Ohm 100W 5
New Brand No64K4821 Ohmite L100J250E Resistor Power 250 Ohm 100W 5
$26.20
quality
New Brand No64K3764 Ohmite B20J15Ke Wirewound Resistor 15Kohm 20W 5
New Brand No64K3764 Ohmite B20J15Ke Wirewound Resistor 15Kohm 20W 5
$21.26
quality
New Brand No64K3717 Ohmite B12J3K5E Wirewound Resistor 35Kohm 12W 5
New Brand No64K3717 Ohmite B12J3K5E Wirewound Resistor 35Kohm 12W 5
$19.94
quality
New Brand No64K8027 Ohmite 21J120E Wirewound Resistor 120 Ohm 1W 5
New Brand No64K8027 Ohmite 21J120E Wirewound Resistor 120 Ohm 1W 5
$18.67
quality
New Brand No64K8677 Ohmite 41F2K2E Wirewound Resistor 22Kohm 1W 1
New Brand No64K8677 Ohmite 41F2K2E Wirewound Resistor 22Kohm 1W 1
$18.73
quality
New Brand No64K3714 Ohmite B12J25Re Wirewound Resistor 25 Ohm 12W 5
New Brand No64K3714 Ohmite B12J25Re Wirewound Resistor 25 Ohm 12W 5
$19.16
quality
New Brand No64K9778 Ohmite 825F750E Wirewound Resistor 750 Ohm 25W 1
New Brand No64K9778 Ohmite 825F750E Wirewound Resistor 750 Ohm 25W 1
$21.61
quality
New Brand No64K6811 Ohmite Tdh35P10R0Je Thick Film Resistor 10 Ohm 35W 5
New Brand No64K6811 Ohmite Tdh35P10R0Je Thick Film Resistor 10 Ohm 35W 5
$21.80
quality
New Brand No73J8663 Ohmite Tch35P33R0Je Thick Film Resistor 33 Ohm 35W 5
New Brand No73J8663 Ohmite Tch35P33R0Je Thick Film Resistor 33 Ohm 35W 5
$21.90
quality
New Brand No51M1828 Ohmite Sm108035004Fe Thick Film Resistor 5Mohm 2W 1
New Brand No51M1828 Ohmite Sm108035004Fe Thick Film Resistor 5Mohm 2W 1
$19.56
quality
New Brand No64K6769 Ohmite Tch35P15R0Je Thick Film Resistor 15 Ohm 35W 5
New Brand No64K6769 Ohmite Tch35P15R0Je Thick Film Resistor 15 Ohm 35W 5
$20.44
quality
New Brand No64K4095 Ohmite Cs3Fr010E Current Sense Resistor 001 Ohm 3W 1
New Brand No64K4095 Ohmite Cs3Fr010E Current Sense Resistor 001 Ohm 3W 1
$27.70
quality
New Brand No49X0243 Ohmite Ey150Ke Resistor Ceramic 15Ohm 25W 10 Axial
New Brand No49X0243 Ohmite Ey150Ke Resistor Ceramic 15Ohm 25W 10 Axial
$18.92
quality
New Brand No64K9746 Ohmite 810F50Re Wirewound Resistor 50 Ohm 10W 1
New Brand No64K9746 Ohmite 810F50Re Wirewound Resistor 50 Ohm 10W 1
$20.41
quality
New Brand No64K3737 Ohmite B12J500E Wirewound Resistor 500 Ohm 12W 5
New Brand No64K3737 Ohmite B12J500E Wirewound Resistor 500 Ohm 12W 5
$19.75
quality
New Brand No51M1827 Ohmite Sm108035003Fe Thick Film Resistor 500Kohm 2W 1
New Brand No51M1827 Ohmite Sm108035003Fe Thick Film Resistor 500Kohm 2W 1
$19.56
quality
New Brand No64K9396 Ohmite 6128P 8 1 2E Mounting Bracket 210 270 Resistor
New Brand No64K9396 Ohmite 6128P 8 1 2E Mounting Bracket 210 270 Resistor
$40.01
quality
New Brand No64K3719 Ohmite B12J30Ke Wirewound Resistor 30Kohm 12W 5
New Brand No64K3719 Ohmite B12J30Ke Wirewound Resistor 30Kohm 12W 5
$23.95
quality
New Brand No64K3699 Ohmite B12J15Ke Wirewound Resistor 15Kohm 12W 5
New Brand No64K3699 Ohmite B12J15Ke Wirewound Resistor 15Kohm 12W 5
$20.21
quality
New Brand No64K3794 Ohmite B20J500E Wirewound Resistor 500 Ohm 20W 5
New Brand No64K3794 Ohmite B20J500E Wirewound Resistor 500 Ohm 20W 5
$19.66
quality
New Brand No64K3547 Ohmite Aw100Ke Resistor Ceramic 10 Ohm 25W 10
New Brand No64K3547 Ohmite Aw100Ke Resistor Ceramic 10 Ohm 25W 10
$31.85
quality
New Brand No65K0117 Ohmite 90J15Re Wirewound Resistor 15 Ohm 11W 5
New Brand No65K0117 Ohmite 90J15Re Wirewound Resistor 15 Ohm 11W 5
$23.56
quality
New Brand No65K0622 Ohmite 95J3K9E Wirewound Resistor 39Kohm 5W 5
New Brand No65K0622 Ohmite 95J3K9E Wirewound Resistor 39Kohm 5W 5
$20.32
quality
New Brand No65K0080 Ohmite 850F750E Wirewound Resistor 750 Ohm 50W 1
New Brand No65K0080 Ohmite 850F750E Wirewound Resistor 750 Ohm 50W 1
$21.90
quality
New Brand No66W8260 Ohmite Tp810Pw50R0Je Thick Film Resistor 50 Ohm 5 10W
New Brand No66W8260 Ohmite Tp810Pw50R0Je Thick Film Resistor 50 Ohm 5 10W
$24.32
quality
New Brand No64K6826 Ohmite Tdh35P47R0Je Thick Film Resistor 47 Ohm 35W 5
New Brand No64K6826 Ohmite Tdh35P47R0Je Thick Film Resistor 47 Ohm 35W 5
$22.03
quality
New Brand No51M1831 Ohmite Sm108035007Fe Thick Film Resistor 5Gohm 2W 1
New Brand No51M1831 Ohmite Sm108035007Fe Thick Film Resistor 5Gohm 2W 1
$19.56
quality
New Brand No64K9777 Ohmite 825F75Re Wirewound Resistor 75 Ohm 25W 1
New Brand No64K9777 Ohmite 825F75Re Wirewound Resistor 75 Ohm 25W 1
$21.46
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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