Ohmite Resistors

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Ohmite L225J10R 10 Ohms Wire Wound Resistor Dummy Load New
Ohmite L225J10R 10 Ohms Wire Wound Resistor Dummy Load New
$29.95
quality
Ohmite 5 Ohm 225W Power Resistor High Wattage L225J5R0 NEW USA Wire Wound
Ohmite 5 Ohm 225W Power Resistor High Wattage L225J5R0 NEW USA Wire Wound
$8.99
quality
Ohmite Resistor 50000 Ohm 1 New
Ohmite Resistor 50000 Ohm 1 New
$9.95
quality
Ohmite 10 Ohm 225W Power Resistor High Wattage L225J10R NEW USA Wire Wound
Ohmite 10 Ohm 225W Power Resistor High Wattage L225J10R NEW USA Wire Wound
$8.99
quality
Ohmite 50 Ohm 225W Power Resistor High Wattage L225J50R NEW USA Wire Wound
Ohmite 50 Ohm 225W Power Resistor High Wattage L225J50R NEW USA Wire Wound
$8.99
quality
Ohmite 50 Ohm 100W Power Resistor High Wattage L100J50R NEW USA Wire Wound
Ohmite 50 Ohm 100W Power Resistor High Wattage L100J50R NEW USA Wire Wound
$8.99
quality
Ohmite 100 Ohm 100W Power Resistor High Wattage L100J100R NEW USA Wire Wound
Ohmite 100 Ohm 100W Power Resistor High Wattage L100J100R NEW USA Wire Wound
$8.99
quality
Ohmite 1000 1k Ohm Adjustable 100W Power Resistor High Wattage D100K1K0 NEW USA
Ohmite 1000 1k Ohm Adjustable 100W Power Resistor High Wattage D100K1K0 NEW USA
$8.99
quality
Ohmite 50 Ohm 50W Power Resistor High Wattage L50J50R NEW USA Wire Wound
Ohmite 50 Ohm 50W Power Resistor High Wattage L50J50R NEW USA Wire Wound
$4.99
quality
Ohmite 200 Ohm 50W Power Resistor High Wattage L50J200R NEW USA Wire Wound
Ohmite 200 Ohm 50W Power Resistor High Wattage L50J200R NEW USA Wire Wound
$4.99
quality
OHMITE D100K 3R0 DIVIDOHM ADJUSTABLE POWER RESISTOR 3 0HMS 100 WATTS NIB
OHMITE D100K 3R0 DIVIDOHM ADJUSTABLE POWER RESISTOR 3 0HMS 100 WATTS NIB
$11.98
quality
OHMITE D100K 5R0 DIVIDOHM ADJUSTABLE POWER RESISTOR 5 0HMS 100 WATTS NIB
OHMITE D100K 5R0 DIVIDOHM ADJUSTABLE POWER RESISTOR 5 0HMS 100 WATTS NIB
$11.98
quality
OHMITE D12K 2R0 DIVIDOHM ADJUSTABLE POWER RESISTOR 2 0HMS 12 WATTS NIB
OHMITE D12K 2R0 DIVIDOHM ADJUSTABLE POWER RESISTOR 2 0HMS 12 WATTS NIB
$5.98
quality
OHMITE L225J 50R WIRE WOUND POWER LUG RESISTOR 50 0HMS 225 WATTS 0902 5 NIB
OHMITE L225J 50R WIRE WOUND POWER LUG RESISTOR 50 0HMS 225 WATTS 0902 5 NIB
$8.98
quality
OHMITE L225J 100 WIRE WOUND POWER LUG RESISTOR 100 0HMS 225 WATTS 5 NIB
OHMITE L225J 100 WIRE WOUND POWER LUG RESISTOR 100 0HMS 225 WATTS 5 NIB
$11.98
quality
OHMITE D175K 3R0 ADJUSTABLE WIRE WOUND POWER RESISTOR 3 OHMS 175 WATTS 1156C NIB
OHMITE D175K 3R0 ADJUSTABLE WIRE WOUND POWER RESISTOR 3 OHMS 175 WATTS 1156C NIB
$22.98
quality
Ohmite 150 Ohm 12W Power Resistor High Wattage LN12J150 NEW USA Wire Wound
Ohmite 150 Ohm 12W Power Resistor High Wattage LN12J150 NEW USA Wire Wound
$4.99
quality
Ohmite 75 Ohm 12W Power Resistor High Wattage LN12J75R NEW USA Wire Wound
Ohmite 75 Ohm 12W Power Resistor High Wattage LN12J75R NEW USA Wire Wound
$4.99
quality
Bracket Mount Ohmite Resistor Powr rib Series 85 Ohms
Bracket Mount Ohmite Resistor Powr rib Series 85 Ohms
$60.00
quality
100 Watt 10 Ohm Ohmite Vitreous Enameled Lug Resistor New 4 AVAILABLE
100 Watt 10 Ohm Ohmite Vitreous Enameled Lug Resistor New 4 AVAILABLE
$9.00
quality
MIXED LOT OF 10 NOS POWER RESISTORS OHMITE MALLORY IRC AND OTHERS
MIXED LOT OF 10 NOS POWER RESISTORS OHMITE MALLORY IRC AND OTHERS
$3.99
quality
Ohmite 25J1K0E 1000 Ohm 5 Watt Resistor Box of 25
Ohmite 25J1K0E 1000 Ohm 5 Watt Resistor Box of 25
$15.99
quality
Ohmite Resistors NOS 3 PCS Vitreous Enameled 100 Ohms 10 Watts Excellent
Ohmite Resistors NOS 3 PCS Vitreous Enameled 100 Ohms 10 Watts Excellent
$4.95
quality
Ohmite Resistor No 0563 DIVIDOHM 210 50K 40 50 OHMS 50 WATT 8027
Ohmite Resistor No 0563 DIVIDOHM 210 50K 40 50 OHMS 50 WATT 8027
$7.99
quality
OHMITE PFE5K8R50 POWER RIB RESISTOR 850 OHMS F 3rd
OHMITE PFE5K8R50 POWER RIB RESISTOR 850 OHMS F 3rd
$175.00
quality
30x Ohmite 45JR10 5W 1 Silicone Ceramic Conformal Axial Wirewound Resistor
30x Ohmite 45JR10 5W 1 Silicone Ceramic Conformal Axial Wirewound Resistor
$29.99
quality
OHMITE VITREOUS ENAMELED RESISTOR E300KR50 NSN 5905 01 278 7966 300W 050OHMS
OHMITE VITREOUS ENAMELED RESISTOR E300KR50 NSN 5905 01 278 7966 300W 050OHMS
$27.50
quality
OHMITE 100 WATT RESISTOR CAT 0600D 100W 20HSM NIB
OHMITE 100 WATT RESISTOR CAT 0600D 100W 20HSM NIB
$10.99
quality
Ohmite 210 100M 40 Resistor 100 Watt 250 Ohm No 0960B 210100M40
Ohmite 210 100M 40 Resistor 100 Watt 250 Ohm No 0960B 210100M40
$9.99
quality
4 Ohmite D50K150 Resistors 50W
4 Ohmite D50K150 Resistors 50W
$30.00
quality
Ohmite L50J10R 270 Series Resistor 10 Ohms 5 50W NIB
Ohmite L50J10R 270 Series Resistor 10 Ohms 5 50W NIB
$12.00
quality
OHMITE Resistor 0956A 1 Ohm 100 Watts 100W 10Amps N288S 31398
OHMITE Resistor 0956A 1 Ohm 100 Watts 100W 10Amps N288S 31398
$19.95
quality
Ohmite 270 100M 40 Resistor 100 Watts 5 OHMS Stock No 0600A
Ohmite 270 100M 40 Resistor 100 Watts 5 OHMS Stock No 0600A
$19.55
quality
Lot of 6 Ohmite B8J20R 5W 20 Ohm Wirewound Power Resistor Ceramic Case
Lot of 6 Ohmite B8J20R 5W 20 Ohm Wirewound Power Resistor Ceramic Case
$37.00
quality
NEW OHMITE D100K1K0 1000OHM 100W RESISTOR D286380
NEW OHMITE D100K1K0 1000OHM 100W RESISTOR D286380
$11.00
quality
Ohmite StackOhm F513 Resistor 55 Watt 100 Ohm New
Ohmite StackOhm F513 Resistor 55 Watt 100 Ohm New
$4.88
quality
Ohmite 90J18K WIREWOUND RESISTOR 18K Ohm 11W 5 AXIAL Flame Ret NEW 5 PKG
Ohmite 90J18K WIREWOUND RESISTOR 18K Ohm 11W 5 AXIAL Flame Ret NEW 5 PKG
$9.99
quality
Lot of 10 D225K5R0 Ohmite Resistor
Lot of 10 D225K5R0 Ohmite Resistor
$130.00
quality
Ohmite 90J7R5 Resistor 75 Ohm 11Watt WW
Ohmite 90J7R5 Resistor 75 Ohm 11Watt WW
$1.84
quality
OHMITE 1742 BROWN DEVIL 2K OHMS 5 RESISTOR 12W 100 Pcs
OHMITE 1742 BROWN DEVIL 2K OHMS 5 RESISTOR 12W 100 Pcs
$50.00
quality
Ohmite MOX97025004FVE Super Mox RES 5M OHM 20W AXIAL Through Hole Resistors NEW
Ohmite MOX97025004FVE Super Mox RES 5M OHM 20W AXIAL Through Hole Resistors NEW
$5.85
quality
Lot of 3 New O S Ohmite vitreous enameled resistor 0411 50 watt 5K ohms L50J5K0
Lot of 3 New O S Ohmite vitreous enameled resistor 0411 50 watt 5K ohms L50J5K0
$35.00
quality
Ohmite D25K5K0E Resistor 25W 5000Ohm
Ohmite D25K5K0E Resistor 25W 5000Ohm
$20.00
quality
OHMITE RESISTOR  RW22V1R5 NSN 5905 00 803 9173
OHMITE RESISTOR RW22V1R5 NSN 5905 00 803 9173
$26.50
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
$20.00
quality
OHMITE 0405 1000 Ohm 50W Resistor
OHMITE 0405 1000 Ohm 50W Resistor
$8.95
quality
Ohmite PFE5KR330 Power Rib Resistor 33 Ohms 2308 NEW in Box Free Shipping
Ohmite PFE5KR330 Power Rib Resistor 33 Ohms 2308 NEW in Box Free Shipping
$75.00
quality
Ohmite 2308 Power Rib Resistor 33 Ohms PFE5KR330 NEW in Box Free Shipping
Ohmite 2308 Power Rib Resistor 33 Ohms PFE5KR330 NEW in Box Free Shipping
$75.00
quality
Ohmite PFE5KR220 Power Rib Resistor 22 Ohms NEW in Box Free Shipping
Ohmite PFE5KR220 Power Rib Resistor 22 Ohms NEW in Box Free Shipping
$75.00
quality
Ohmite 2301 Power Rib Resistor 10 Ohms NEW in Box Free Shipping
Ohmite 2301 Power Rib Resistor 10 Ohms NEW in Box Free Shipping
$75.00
quality
Ohmite 2304A Power Rib Resistor 16 Ohms NEW in Box Free Shipping
Ohmite 2304A Power Rib Resistor 16 Ohms NEW in Box Free Shipping
$75.00
quality
NEW 5K OHM 225W WIREWOUND RESISTOR OHMITE L225J5K0
NEW 5K OHM 225W WIREWOUND RESISTOR OHMITE L225J5K0
$16.95
quality
Ohmite RJS800 Resistor 300V 800 OHMS 0250A Used AS IS
Ohmite RJS800 Resistor 300V 800 OHMS 0250A Used AS IS
$13.00
quality
NEW OHMITE L50J50RE 50 OHM RESISTOR IN OHMITE PACKAGING
NEW OHMITE L50J50RE 50 OHM RESISTOR IN OHMITE PACKAGING
$17.95
quality
Ohmite 12 Ohm 50W Ceramic Wirewound Resistor RJS12R
Ohmite 12 Ohm 50W Ceramic Wirewound Resistor RJS12R
$14.99
quality
35 PCS DALE RESISTORS BBFW 18MEGPORM10PCT HP OHMITE
35 PCS DALE RESISTORS BBFW 18MEGPORM10PCT HP OHMITE
$34.95
quality
Lot of 5 Ohmite B12J5OR Resistor 50 Ohm 12W 8952 New Old Stock
Lot of 5 Ohmite B12J5OR Resistor 50 Ohm 12W 8952 New Old Stock
$15.00
quality
782 Resistors 3W 5W Clarostat Ohmite Dale RCL EACH PART LABELED FOR RESALE
782 Resistors 3W 5W Clarostat Ohmite Dale RCL EACH PART LABELED FOR RESALE
$25.00
quality
VARIOUS LOT OF OHMITE RESISTORS USED
VARIOUS LOT OF OHMITE RESISTORS USED
$15.00
quality
Ohmite 0200N 4ohms 25W vitreous enameled resistor
Ohmite 0200N 4ohms 25W vitreous enameled resistor
$4.75
quality
10 Ohmite TK20P3R00JE 3 Ohm 20W TFilm Resistors TO 220
10 Ohmite TK20P3R00JE 3 Ohm 20W TFilm Resistors TO 220
$12.99
quality
25 Ohmite 0100 Ohm 1 1W Precision Current Sensing Power Resistor RW1S0BAR100FT
25 Ohmite 0100 Ohm 1 1W Precision Current Sensing Power Resistor RW1S0BAR100FT
$11.99
quality
1 UNIT P N 270 50K 40 OHMITE RESISTOR 50W 250 OHM NEW
1 UNIT P N 270 50K 40 OHMITE RESISTOR 50W 250 OHM NEW
$4.99
quality
Ohmite High Current WireWound 100 Ohm 210W Chassis Mount Resistor  L225J100
Ohmite High Current WireWound 100 Ohm 210W Chassis Mount Resistor L225J100
$10.00
quality
NEW LOT OF 4 OHMITE RESISTOR 1004 12 WATTS 5 OHMS NEW IN BOX
NEW LOT OF 4 OHMITE RESISTOR 1004 12 WATTS 5 OHMS NEW IN BOX
$14.99
quality
Ohmite 810F1R0 Resistor
Ohmite 810F1R0 Resistor
$7.95
quality
Ohmite 810F1R0E Resistor
Ohmite 810F1R0E Resistor
$7.95
quality
OHMITE VARIABLE RESISTOR  RP111FD501KK NSN 5905 00 665 7855 M22 04 00181FD
OHMITE VARIABLE RESISTOR RP111FD501KK NSN 5905 00 665 7855 M22 04 00181FD
$97.50
quality
Ohmite D100K 1R0 1 Ohm 100 watt Resistor
Ohmite D100K 1R0 1 Ohm 100 watt Resistor
$13.50
quality
NEW LOT OF 2 OHMITE D25K50R TYPE 210 DIVIDOHM RESISTOR 25 WATT 50 OHMS NIB
NEW LOT OF 2 OHMITE D25K50R TYPE 210 DIVIDOHM RESISTOR 25 WATT 50 OHMS NIB
$19.99
quality
NEW LOT OF 6 OHMITE RESISTOR 0200H 25 WATTS 200 OHMS NEW IN BOX
NEW LOT OF 6 OHMITE RESISTOR 0200H 25 WATTS 200 OHMS NEW IN BOX
$49.99
quality
BRAND NEW OHMITE RESISTOR 50W 15OHMS MODEL RE75G15R0 4 AVAILABLE
BRAND NEW OHMITE RESISTOR 50W 15OHMS MODEL RE75G15R0 4 AVAILABLE
$19.99
quality
Ohmite 73 10 25 Ohm 5 Tunnel Power Resistor Ceramic 59724 2396505
Ohmite 73 10 25 Ohm 5 Tunnel Power Resistor Ceramic 59724 2396505
$4.25
quality
2 PCS Wirewound Resistors Through Hole 10watt 4ohm 1 Axia
2 PCS Wirewound Resistors Through Hole 10watt 4ohm 1 Axia
$5.99
quality
New 500 ohm 225 Watt Ohmite Resistor
New 500 ohm 225 Watt Ohmite Resistor
$24.95
quality
OHMITE HEICO VARIABLE RESISTOR H 60 F2 T2 60 OHMS NSN 5905 01 053 8369
OHMITE HEICO VARIABLE RESISTOR H 60 F2 T2 60 OHMS NSN 5905 01 053 8369
$16.95
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
$27.50
quality
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 100K  100W 5 Vitreous Enamel Power Resistor Lug Terminal
Ohmite 100K 100W 5 Vitreous Enamel Power Resistor Lug Terminal
$9.99
quality
4 pieces Variable Resistors Ohmite p n RP102FD201KK  M22 03 00152FD htf New
4 pieces Variable Resistors Ohmite p n RP102FD201KK M22 03 00152FD htf New
$300.00
quality
7 VINTAGE OHMITE 1 WATT CARBON COMP RESISTORS 15M to 10M ohms SEE LIST NOS
7 VINTAGE OHMITE 1 WATT CARBON COMP RESISTORS 15M to 10M ohms SEE LIST NOS
$3.50
quality
NEW OHMITE L225J50R 260 PPM C POWER 50OHM 225W RESISTOR B442077
NEW OHMITE L225J50R 260 PPM C POWER 50OHM 225W RESISTOR B442077
$20.00
quality
10 VINTAGE OHMITE 2 WATT CARBON COMP RESISTORS 662K247K168K
10 VINTAGE OHMITE 2 WATT CARBON COMP RESISTORS 662K247K168K
$7.50
quality
6 VINTAGE OHMITE 2 WATT CARBON COMP RESISTORS 100K to 680KohmsSEE BELOW NOS
6 VINTAGE OHMITE 2 WATT CARBON COMP RESISTORS 100K to 680KohmsSEE BELOW NOS
$4.50
quality
5 VINTAGE OHMITE 2 WATT CARBON COMP RESISTORS 1M to 68M SEE BELOW NOS
5 VINTAGE OHMITE 2 WATT CARBON COMP RESISTORS 1M to 68M SEE BELOW NOS
$3.50
quality
6 VINTAGE OHMITE 1 WATT CARBON COMP RESISTORS 47 to 68 ohms SEE LIST NOS
6 VINTAGE OHMITE 1 WATT CARBON COMP RESISTORS 47 to 68 ohms SEE LIST NOS
$2.95
quality
13 VINTAGE OHMITE 1 WATT CARBON COMP RESISTORS 1K to 62K SEE LIST BELOW NOS
13 VINTAGE OHMITE 1 WATT CARBON COMP RESISTORS 1K to 62K SEE LIST BELOW NOS
$7.50
quality
Vintage Ohmite Large Resistor 75 OHM 0903 225 WATT Two Way Ham Radio Meter VHF
Vintage Ohmite Large Resistor 75 OHM 0903 225 WATT Two Way Ham Radio Meter VHF
$9.99
quality
OHMITE RESISTOR 225W 75 OHMS L225J75R NEW
OHMITE RESISTOR 225W 75 OHMS L225J75R NEW
$11.00
quality
OHMITE 12 ASSORTED DRAWER ORGANIZER CABINET CAPACITORS RESISTORS B269616
OHMITE 12 ASSORTED DRAWER ORGANIZER CABINET CAPACITORS RESISTORS B269616
$50.00
quality
Vintage Mallory Power RESISTOR 55W 100 OHMS NOS Tube Amp Hifi Rw35v101
Vintage Mallory Power RESISTOR 55W 100 OHMS NOS Tube Amp Hifi Rw35v101
$19.95
quality
Vintage OHMITE RESISTOR 75W 100 OHMS With Center Tap NOS Tube Amp Hifi
Vintage OHMITE RESISTOR 75W 100 OHMS With Center Tap NOS Tube Amp Hifi
$19.95
quality
10 Pcs Resistors 36 Meg Ohm 1 Watt 5 RC32GF365J Carbon Comp
10 Pcs Resistors 36 Meg Ohm 1 Watt 5 RC32GF365J Carbon Comp
$8.02
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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