Ohmite Resistors

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4 Ohmite Resistors Ceramic Power Resistors WireWound 16 OHM 8 Watt RW30G1R6
4 Ohmite Resistors Ceramic Power Resistors WireWound 16 OHM 8 Watt RW30G1R6
$8.82
quality
OHMITE RESISTOR RESISTORS ELECTRIC ELECTICAL L225J15R 15 OHMS 5
OHMITE RESISTOR RESISTORS ELECTRIC ELECTICAL L225J15R 15 OHMS 5
$10.00
quality
OHMITE 2500 OHMS 225W ENAMELED RESISTOR D225K2K5
OHMITE 2500 OHMS 225W ENAMELED RESISTOR D225K2K5
$12.00
quality
Ohmite Resistor 11W 1ohm 90J1R0 Lot of 5 New
Ohmite Resistor 11W 1ohm 90J1R0 Lot of 5 New
$15.00
quality
Ohmite Power Resistor L25J3K0 3k Ohms New
Ohmite Power Resistor L25J3K0 3k Ohms New
$7.95
quality
OHMITE RESISTOR ASSEMBLY 270N 50K 40 100R0J 8944 270N50K40
OHMITE RESISTOR ASSEMBLY 270N 50K 40 100R0J 8944 270N50K40
$7.25
quality
Ohmite Resistor L25J25R 25 Ohm 25 Watt NIB
Ohmite Resistor L25J25R 25 Ohm 25 Watt NIB
$10.00
quality
Ohmite Resistor L100J100 100 Ohm 100 Watt NIB
Ohmite Resistor L100J100 100 Ohm 100 Watt NIB
$10.00
quality
OHMITE IC9006C101A650 650OHM RESISTOR D523587
OHMITE IC9006C101A650 650OHM RESISTOR D523587
$10.46
quality
Ohmite 102206 Variable Resistor 250 OHM New
Ohmite 102206 Variable Resistor 250 OHM New
$90.00
quality
Lot Of 5 OHMITE TUBULAR RESISTOR L225J250 4x  L225J1K10 shipsameday 1224A
Lot Of 5 OHMITE TUBULAR RESISTOR L225J250 4x L225J1K10 shipsameday 1224A
$125.00
quality
OHMITE Resistor 25 Ohm 5 12W 5 PCS
OHMITE Resistor 25 Ohm 5 12W 5 PCS
$9.99
quality
OHMITE 750 OHM WIREWOUND RESISTOR 60 115MK750 276 LOT OF 6
OHMITE 750 OHM WIREWOUND RESISTOR 60 115MK750 276 LOT OF 6
$19.99
quality
NEW OHMITE RESISTOR 0909 1000  OHMS
NEW OHMITE RESISTOR 0909 1000 OHMS
$4.00
quality
OHMITE 1 OHM 25 WATT RESISTOR
OHMITE 1 OHM 25 WATT RESISTOR
$10.00
quality
OHMITE 500OHMS 100W VITREOUS ENAMELED RESISTORS NIB L100J 500 102594
OHMITE 500OHMS 100W VITREOUS ENAMELED RESISTORS NIB L100J 500 102594
$24.95
quality
Ohmite 50 25 15 Ohms Lug Resistors L225 Enamel Coated Four Fire Retard Units
Ohmite 50 25 15 Ohms Lug Resistors L225 Enamel Coated Four Fire Retard Units
$55.00
quality
ohmite resistor 1250 OHMS 25 WATTS  0375B
ohmite resistor 1250 OHMS 25 WATTS 0375B
$6.00
quality
13 Ohm 5W 1 Lot of 5 Ohmite RW74U13R0F WireWound Resistor Axial
13 Ohm 5W 1 Lot of 5 Ohmite RW74U13R0F WireWound Resistor Axial
$13.50
quality
OHMITE RJS150 RHEOSTAT 150OHM POTENTIOMETER RESISTOR D557404
OHMITE RJS150 RHEOSTAT 150OHM POTENTIOMETER RESISTOR D557404
$25.00
quality
Ohmite 9E Bracket For Resistor NOP
Ohmite 9E Bracket For Resistor NOP
$4.99
quality
NEW OHMITE RKS2K5E RHEOSTAT 2500OHM POTENTIOMETER RESISTOR D557382
NEW OHMITE RKS2K5E RHEOSTAT 2500OHM POTENTIOMETER RESISTOR D557382
$60.00
quality
New 2 pcs of Dale 100 ohm 12W Wirewound resistor adjustable lugs D12K100
New 2 pcs of Dale 100 ohm 12W Wirewound resistor adjustable lugs D12K100
$25.00
quality
Ohmite D225K100 Vitreous Enameled Resistor 225W 100 Ohm NEW
Ohmite D225K100 Vitreous Enameled Resistor 225W 100 Ohm NEW
$26.99
quality
NIB OHMITE VITREOUS ENAMELED FIXED RESISTOR NO 0711 RESISTANCE 2000 OHMS
NIB OHMITE VITREOUS ENAMELED FIXED RESISTOR NO 0711 RESISTANCE 2000 OHMS
$19.95
quality
NEW OHMITE RESISTOR 1500  0910
NEW OHMITE RESISTOR 1500 0910
$5.00
quality
LOT 2 NEW OHMITE D50K500 0569 50W 500OHM RESISTOR D526480
LOT 2 NEW OHMITE D50K500 0569 50W 500OHM RESISTOR D526480
$10.46
quality
Ohmite 0607 Resistor 100W 500 Ohm NEW
Ohmite 0607 Resistor 100W 500 Ohm NEW
$12.99
quality
182 Ohm 5 Watt Lot of 5 OHMITE M38 KS14603 Vitreous WireWound Resistor Axial
182 Ohm 5 Watt Lot of 5 OHMITE M38 KS14603 Vitreous WireWound Resistor Axial
$13.50
quality
OHMITE TA303PA1R00J Power Chip Resistor 1 Ohm 3W 5 NEW 5 PKG
OHMITE TA303PA1R00J Power Chip Resistor 1 Ohm 3W 5 NEW 5 PKG
$4.99
quality
40 Ohm 3W Lot of 10 Ohmite 93J40R WireWound Resistor Axial 3 Watt
40 Ohm 3W Lot of 10 Ohmite 93J40R WireWound Resistor Axial 3 Watt
$16.00
quality
Ohmite L50J5K0 Power Resistor 50 Watt 5000 Ohm L50J5KO
Ohmite L50J5K0 Power Resistor 50 Watt 5000 Ohm L50J5KO
$12.99
quality
OHMITE L25F1R0 R RESISTOR POWER 1 10 OHM 25W 1 REPLACING FOR 20W 16W 15W
OHMITE L25F1R0 R RESISTOR POWER 1 10 OHM 25W 1 REPLACING FOR 20W 16W 15W
$17.99
quality
Ohmite Resistor 03 Ohm 5 3W Single Thru Hole 7 PCS
Ohmite Resistor 03 Ohm 5 3W Single Thru Hole 7 PCS
$9.99
quality
40 Ohm 5W Clarostat VPR 5 F Wirewound Power Resistor Ceramic Case NEW
40 Ohm 5W Clarostat VPR 5 F Wirewound Power Resistor Ceramic Case NEW
$4.95
quality
LOT OF 3 OHMITE DIVIDHOM 210 175P 46 NO 1159 RESISTOR OHMS 50 175WATT 210175P46
LOT OF 3 OHMITE DIVIDHOM 210 175P 46 NO 1159 RESISTOR OHMS 50 175WATT 210175P46
$45.00
quality
OHMITE Lug Resistor D225K50R
OHMITE Lug Resistor D225K50R
$55.00
quality
L225J1R5E Ohmite 225 Watt 15 Ohm 5 Wirewound Vitreous Enamel Resistor
L225J1R5E Ohmite 225 Watt 15 Ohm 5 Wirewound Vitreous Enamel Resistor
$17.50
quality
1 Ohm 12W Ohmite B12J1R0 Wirewound Power Resistor Ceramic Case NEW
1 Ohm 12W Ohmite B12J1R0 Wirewound Power Resistor Ceramic Case NEW
$4.95
quality
2 Ohm 12W Ohmite B12J2R0 Wirewound Power Resistor Ceramic Case NEW
2 Ohm 12W Ohmite B12J2R0 Wirewound Power Resistor Ceramic Case NEW
$4.95
quality
Ohmite 5K Ohm 50 Watt adjustable Power Resistor
Ohmite 5K Ohm 50 Watt adjustable Power Resistor
$14.00
quality
LOT OF 15 NEW OHMITE RESISTORS 83F340
LOT OF 15 NEW OHMITE RESISTORS 83F340
$55.20
quality
Ohmite Power Wirewound Potentiometer Variable Resistor 1 OHM 100 W 10A
Ohmite Power Wirewound Potentiometer Variable Resistor 1 OHM 100 W 10A
$20.95
quality
5 Ohm 12W Ohmite B12J5R0 Wirewound Power Resistor Ceramic Case NEW
5 Ohm 12W Ohmite B12J5R0 Wirewound Power Resistor Ceramic Case NEW
$4.95
quality
Ohmite HSN250 250 watt resistor 18 OHM New  45
Ohmite HSN250 250 watt resistor 18 OHM New 45
$40.50
quality
Qty  1 D12K5R0 Ohmite 12 Watt 5 Ohm 10 Adjustable Wirewound Resistor
Qty 1 D12K5R0 Ohmite 12 Watt 5 Ohm 10 Adjustable Wirewound Resistor
$12.75
quality
D50K75R Ohmite 50 Watt 75 Ohm 10 Adjustable Wirewound Resistor
D50K75R Ohmite 50 Watt 75 Ohm 10 Adjustable Wirewound Resistor
$17.50
quality
D12K300 Ohmite 12 Watt 300 Ohm 10 Adjustable Wirewound Resistor
D12K300 Ohmite 12 Watt 300 Ohm 10 Adjustable Wirewound Resistor
$12.75
quality
D12K1R0 Ohmite 12 Watt 1 Ohm 10 Adjustable Wirewound Resistor
D12K1R0 Ohmite 12 Watt 1 Ohm 10 Adjustable Wirewound Resistor
$12.75
quality
D50K2K25 Ohmite 50 Watt 225K Ohm 10 Adjustable Wirewound Resistor
D50K2K25 Ohmite 50 Watt 225K Ohm 10 Adjustable Wirewound Resistor
$17.50
quality
D50K40K Ohmite 50 Watt 40K Ohm 10 Adjustable Wirewound Resistor
D50K40K Ohmite 50 Watt 40K Ohm 10 Adjustable Wirewound Resistor
$17.50
quality
D12K200 Ohmite 12 Watt 200 Ohm 10 Adjustable Wirewound Resistor
D12K200 Ohmite 12 Watt 200 Ohm 10 Adjustable Wirewound Resistor
$12.75
quality
D12K400 Ohmite 12 Watt 400 Ohm 10 Adjustable Wirewound Resistor
D12K400 Ohmite 12 Watt 400 Ohm 10 Adjustable Wirewound Resistor
$12.75
quality
D75K1K5 Ohmite 75 Watt 15K Ohm 10 Adjustable Wirewound Resistor
D75K1K5 Ohmite 75 Watt 15K Ohm 10 Adjustable Wirewound Resistor
$19.75
quality
D50K60K Ohmite 50 Watt 60K Ohm 10 Adjustable Wirewound Resistor
D50K60K Ohmite 50 Watt 60K Ohm 10 Adjustable Wirewound Resistor
$17.50
quality
D12K7R5 Ohmite 12 Watt 75 Ohm 10 Adjustable Wirewound Resistor
D12K7R5 Ohmite 12 Watt 75 Ohm 10 Adjustable Wirewound Resistor
$12.75
quality
D25K50K Ohmite 25 Watt 50K Ohm 10 Adjustable Wirewound Resistor
D25K50K Ohmite 25 Watt 50K Ohm 10 Adjustable Wirewound Resistor
$15.75
quality
D50K400 Ohmite 50 Watt 400 Ohm 10 Adjustable Wirewound Resistor
D50K400 Ohmite 50 Watt 400 Ohm 10 Adjustable Wirewound Resistor
$17.50
quality
D75K100 Ohmite 75 Watt 100 Ohm 10 Adjustable Wirewound Resistor
D75K100 Ohmite 75 Watt 100 Ohm 10 Adjustable Wirewound Resistor
$19.75
quality
D50K31K Ohmite 50 Watt 31K Ohm 10 Adjustable Wirewound Resistor
D50K31K Ohmite 50 Watt 31K Ohm 10 Adjustable Wirewound Resistor
$17.50
quality
D225K7K5 Ohmite 225 Watt 75K Ohm 10 Adjustable Wirewound Resistor
D225K7K5 Ohmite 225 Watt 75K Ohm 10 Adjustable Wirewound Resistor
$26.50
quality
D50K270 Ohmite 50 Watt 270 Ohm 10 Adjustable Wirewound Resistor
D50K270 Ohmite 50 Watt 270 Ohm 10 Adjustable Wirewound Resistor
$17.50
quality
QTY 50 DALE TYPE CW 5 160 5 5W WIREWOUND RESISTORS NEW IN BOX
QTY 50 DALE TYPE CW 5 160 5 5W WIREWOUND RESISTORS NEW IN BOX
$19.99
quality
OHMITE L225J3K0 Vitreous Enameled Wirebound Resistor 225W Chassis Mount NEW
OHMITE L225J3K0 Vitreous Enameled Wirebound Resistor 225W Chassis Mount NEW
$6.99
quality
F40J5R0 Ohmite 40 Watt 5 Ohm 5 StackableWirewound ResistorChassis Mount
F40J5R0 Ohmite 40 Watt 5 Ohm 5 StackableWirewound ResistorChassis Mount
$12.75
quality
10 pcs PF2J390 Ohmite 2 Watt 390 Ohm 5 Metal Film Resistor Axial
10 pcs PF2J390 Ohmite 2 Watt 390 Ohm 5 Metal Film Resistor Axial
$12.25
quality
EW3G2505 Ohmite 2 Watt 25M Ohm 2 High Voltage Thick Film Resistor
EW3G2505 Ohmite 2 Watt 25M Ohm 2 High Voltage Thick Film Resistor
$29.75
quality
F10J1K25 Ohmite 10 Watt 125K Ohm 5StackableWirewound ResistorChassis Mt
F10J1K25 Ohmite 10 Watt 125K Ohm 5StackableWirewound ResistorChassis Mt
$12.75
quality
HS50F25R Ohmite 50 Watt 25 Ohm 1 Wirewound Resistor Chassis Mount
HS50F25R Ohmite 50 Watt 25 Ohm 1 Wirewound Resistor Chassis Mount
$15.50
quality
F10J15R Ohmite 10 Watt 15 Ohm 5 StackableWirewound ResistorChassis Mount
F10J15R Ohmite 10 Watt 15 Ohm 5 StackableWirewound ResistorChassis Mount
$12.75
quality
10 pcs PF2J180 Ohmite 2 Watt 180 Ohm 5 Metal Film Resistor Axial
10 pcs PF2J180 Ohmite 2 Watt 180 Ohm 5 Metal Film Resistor Axial
$12.25
quality
F55J10R Ohmite 55 Watt 10 Ohm 5 StackableWirewound ResistorChassis Mount
F55J10R Ohmite 55 Watt 10 Ohm 5 StackableWirewound ResistorChassis Mount
$16.50
quality
25 pcs PF1J300 Ohmite 1 Watt 300 Ohm 5 Metal Film Resistor Axial
25 pcs PF1J300 Ohmite 1 Watt 300 Ohm 5 Metal Film Resistor Axial
$14.25
quality
5 pcs EW1G2504 Ohmite  Watt 25M Ohm 2 High Voltage Thick Film Resistor
5 pcs EW1G2504 Ohmite Watt 25M Ohm 2 High Voltage Thick Film Resistor
$16.50
quality
10 pcs PF2J75R Ohmite 2 Watt 75 Ohm 5 Metal Film Resistor Axial
10 pcs PF2J75R Ohmite 2 Watt 75 Ohm 5 Metal Film Resistor Axial
$12.25
quality
F30J10R Ohmite 30 Watt 10 Ohm 5 StackableWirewound ResistorChassis Mount
F30J10R Ohmite 30 Watt 10 Ohm 5 StackableWirewound ResistorChassis Mount
$12.75
quality
25 pcs PF1J1K5 Ohmite 1 Watt 15K Ohm 5 Metal Film Resistor Axial
25 pcs PF1J1K5 Ohmite 1 Watt 15K Ohm 5 Metal Film Resistor Axial
$14.25
quality
F30J18R Ohmite 30 Watt 18 Ohm 5 StackableWirewound ResistorChassis Mount
F30J18R Ohmite 30 Watt 18 Ohm 5 StackableWirewound ResistorChassis Mount
$12.75
quality
5 pcs EW2G1004 Ohmite 1 Watt 1M Ohm 2 High Voltage Thick Film Resistor
5 pcs EW2G1004 Ohmite 1 Watt 1M Ohm 2 High Voltage Thick Film Resistor
$16.50
quality
10 pcs PF2J300 Ohmite 2 Watt 300 Ohm 5 Metal Film Resistor Axial
10 pcs PF2J300 Ohmite 2 Watt 300 Ohm 5 Metal Film Resistor Axial
$12.25
quality
F10J3R0 Ohmite 10 Watt 3 Ohm 5 StackableWirewound ResistorChassis Mount
F10J3R0 Ohmite 10 Watt 3 Ohm 5 StackableWirewound ResistorChassis Mount
$12.75
quality
10 pcs PF2J2K2 Ohmite 2 Watt 22K Ohm 5 Metal Film Resistor Axial
10 pcs PF2J2K2 Ohmite 2 Watt 22K Ohm 5 Metal Film Resistor Axial
$12.25
quality
10 pcs PF2J3R0 Ohmite 2 Watt 3 Ohm 5 Metal Film Resistor Axial
10 pcs PF2J3R0 Ohmite 2 Watt 3 Ohm 5 Metal Film Resistor Axial
$12.25
quality
F55J150 Ohmite 55 Watt 150 Ohm 5 StackableWirewound ResistorChassis Mnt
F55J150 Ohmite 55 Watt 150 Ohm 5 StackableWirewound ResistorChassis Mnt
$16.50
quality
10 pcs PF2J1R0 Ohmite 2 Watt 1 Ohm 5 Metal Film Resistor Axial
10 pcs PF2J1R0 Ohmite 2 Watt 1 Ohm 5 Metal Film Resistor Axial
$12.25
quality
F30J1R5 Ohmite 30 Watt 15 Ohm 5 StackableWirewound ResistorChassis Mnt
F30J1R5 Ohmite 30 Watt 15 Ohm 5 StackableWirewound ResistorChassis Mnt
$12.75
quality
10 pcs PF2J18K Ohmite 2 Watt 18K Ohm 5 Metal Film Resistor Axial
10 pcs PF2J18K Ohmite 2 Watt 18K Ohm 5 Metal Film Resistor Axial
$12.25
quality
EX1G5006 Ohmite 1 2 Watt 500M Ohm 2 High Voltage Thick Film Resistor
EX1G5006 Ohmite 1 2 Watt 500M Ohm 2 High Voltage Thick Film Resistor
$12.75
quality
10 pcs PF2J1K0 Ohmite 2 Watt 1K Ohm 5 Metal Film Resistor Axial
10 pcs PF2J1K0 Ohmite 2 Watt 1K Ohm 5 Metal Film Resistor Axial
$12.25
quality
F10J10R Ohmite 10 Watt 10 Ohm 5 StackableWirewound ResistorChassis Mount
F10J10R Ohmite 10 Watt 10 Ohm 5 StackableWirewound ResistorChassis Mount
$12.75
quality
F55J450 Ohmite 55 Watt 450 Ohm 5StackableWirewound Resistor Chassis Mount
F55J450 Ohmite 55 Watt 450 Ohm 5StackableWirewound Resistor Chassis Mount
$16.50
quality
10 pcs PF2J11R Ohmite 2 Watt 11 Ohm 5 Metal Film Resistor Axial
10 pcs PF2J11R Ohmite 2 Watt 11 Ohm 5 Metal Film Resistor Axial
$12.25
quality
HS50F523 Ohmite 50 Watt 523 Ohm 1 Wirewound Resistor Chassis Mount
HS50F523 Ohmite 50 Watt 523 Ohm 1 Wirewound Resistor Chassis Mount
$22.50
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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