Ohmite Resistors

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LOT OF 4 NEW OHMITE B20J50R RESISTORS 20W 50 OHMS VIT 5
LOT OF 4 NEW OHMITE B20J50R RESISTORS 20W 50 OHMS VIT 5
$21.95
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
$20.29
quality
New Brand No64K7994 Ohmite 20J30Ke Wirewound Resistor 30Kohm 10W 5
New Brand No64K7994 Ohmite 20J30Ke Wirewound Resistor 30Kohm 10W 5
$19.17
quality
New Brand No64K8008 Ohmite 20J50Ke Wirewound Resistor 50Kohm 10W 5
New Brand No64K8008 Ohmite 20J50Ke Wirewound Resistor 50Kohm 10W 5
$19.17
quality
New Brand No64K8023 Ohmite 21J1K5E Wirewound Resistor 15Kohm 1W 5
New Brand No64K8023 Ohmite 21J1K5E Wirewound Resistor 15Kohm 1W 5
$19.56
quality
New Brand No64K8026 Ohmite 21J100E Wirewound Resistor 100 Ohm 1W 5
New Brand No64K8026 Ohmite 21J100E Wirewound Resistor 100 Ohm 1W 5
$19.02
quality
New Brand No64K8042 Ohmite 21J500E Wirewound Resistor 500 Ohm 1W 5
New Brand No64K8042 Ohmite 21J500E Wirewound Resistor 500 Ohm 1W 5
$19.75
quality
New Brand No65K0606 Ohmite 95J200E Wirewound Resistor 200 Ohm 5W 5
New Brand No65K0606 Ohmite 95J200E Wirewound Resistor 200 Ohm 5W 5
$19.23
quality
New Brand No64K9631 Ohmite 805F150E Wirewound Resistor 150 Ohm 5W 1
New Brand No64K9631 Ohmite 805F150E Wirewound Resistor 150 Ohm 5W 1
$20.48
quality
New Brand No64K3693 Ohmite B12J12Ke Wirewound Resistor 12Kohm 12W 5
New Brand No64K3693 Ohmite B12J12Ke Wirewound Resistor 12Kohm 12W 5
$20.53
quality
New Brand No64K4821 Ohmite L100J250E Resistor Power 250 Ohm 100W 5
New Brand No64K4821 Ohmite L100J250E Resistor Power 250 Ohm 100W 5
$26.76
quality
New Brand No64K3764 Ohmite B20J15Ke Wirewound Resistor 15Kohm 20W 5
New Brand No64K3764 Ohmite B20J15Ke Wirewound Resistor 15Kohm 20W 5
$21.96
quality
New Brand No64K6450 Ohmite Ta1K0Ph15R0Ke Resistor Power 15 Ohm 1Kw 10
New Brand No64K6450 Ohmite Ta1K0Ph15R0Ke Resistor Power 15 Ohm 1Kw 10
$221.99
quality
New Brand No64K8027 Ohmite 21J120E Wirewound Resistor 120 Ohm 1W 5
New Brand No64K8027 Ohmite 21J120E Wirewound Resistor 120 Ohm 1W 5
$19.02
quality
New Brand No64K8677 Ohmite 41F2K2E Wirewound Resistor 22Kohm 1W 1
New Brand No64K8677 Ohmite 41F2K2E Wirewound Resistor 22Kohm 1W 1
$19.09
quality
New Brand No64K3714 Ohmite B12J25Re Wirewound Resistor 25 Ohm 12W 5
New Brand No64K3714 Ohmite B12J25Re Wirewound Resistor 25 Ohm 12W 5
$19.88
quality
New Brand No64K9778 Ohmite 825F750E Wirewound Resistor 750 Ohm 25W 1
New Brand No64K9778 Ohmite 825F750E Wirewound Resistor 750 Ohm 25W 1
$21.51
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
$22.89
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
$19.70
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
$22.30
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
$28.11
quality
New Brand No49X0243 Ohmite Ey150Ke Resistor Ceramic 15Ohm 25W 10 Axial
New Brand No49X0243 Ohmite Ey150Ke Resistor Ceramic 15Ohm 25W 10 Axial
$20.59
quality
New Brand No64K9746 Ohmite 810F50Re Wirewound Resistor 50 Ohm 10W 1
New Brand No64K9746 Ohmite 810F50Re Wirewound Resistor 50 Ohm 10W 1
$20.32
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 No64K6814 Ohmite Tdh35P150Rje Thick Film Resistor 150 Ohm 35W 5
New Brand No64K6814 Ohmite Tdh35P150Rje Thick Film Resistor 150 Ohm 35W 5
$24.66
quality
New Brand No51M1827 Ohmite Sm108035003Fe Thick Film Resistor 500Kohm 2W 1
New Brand No51M1827 Ohmite Sm108035003Fe Thick Film Resistor 500Kohm 2W 1
$19.70
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
$38.48
quality
New Brand No64K3719 Ohmite B12J30Ke Wirewound Resistor 30Kohm 12W 5
New Brand No64K3719 Ohmite B12J30Ke Wirewound Resistor 30Kohm 12W 5
$20.65
quality
New Brand No64K3699 Ohmite B12J15Ke Wirewound Resistor 15Kohm 12W 5
New Brand No64K3699 Ohmite B12J15Ke Wirewound Resistor 15Kohm 12W 5
$20.53
quality
New Brand No64K3794 Ohmite B20J500E Wirewound Resistor 500 Ohm 20W 5
New Brand No64K3794 Ohmite B20J500E Wirewound Resistor 500 Ohm 20W 5
$19.92
quality
New Brand No64K3547 Ohmite Aw100Ke Resistor Ceramic 10 Ohm 25W 10
New Brand No64K3547 Ohmite Aw100Ke Resistor Ceramic 10 Ohm 25W 10
$32.83
quality
New Brand No65K0117 Ohmite 90J15Re Wirewound Resistor 15 Ohm 11W 5
New Brand No65K0117 Ohmite 90J15Re Wirewound Resistor 15 Ohm 11W 5
$20.42
quality
New Brand No65K0622 Ohmite 95J3K9E Wirewound Resistor 39Kohm 5W 5
New Brand No65K0622 Ohmite 95J3K9E Wirewound Resistor 39Kohm 5W 5
$21.72
quality
New Brand No64K6743 Ohmite Tbh25P3R90Je Thick Film Resistor 39 Ohm 25W 5
New Brand No64K6743 Ohmite Tbh25P3R90Je Thick Film Resistor 39 Ohm 25W 5
$21.23
quality
New Brand No65K0080 Ohmite 850F750E Wirewound Resistor 750 Ohm 50W 1
New Brand No65K0080 Ohmite 850F750E Wirewound Resistor 750 Ohm 50W 1
$22.07
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
$23.11
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
$23.16
quality
New Brand No64K3755 Ohmite B20J1K5E Wirewound Resistor 15Kohm 20W 5
New Brand No64K3755 Ohmite B20J1K5E Wirewound Resistor 15Kohm 20W 5
$20.93
quality
New Brand No64K6778 Ohmite Tch35P24R0Je Thick Film Resistor 24 Ohm 35W 5
New Brand No64K6778 Ohmite Tch35P24R0Je Thick Film Resistor 24 Ohm 35W 5
$21.35
quality
New Brand No66K6835 Ohmite Mox 750231007Je Thick Film Resistor 1Gohm 1W 5
New Brand No66K6835 Ohmite Mox 750231007Je Thick Film Resistor 1Gohm 1W 5
$20.66
quality
New Brand No51M1831 Ohmite Sm108035007Fe Thick Film Resistor 5Gohm 2W 1
New Brand No51M1831 Ohmite Sm108035007Fe Thick Film Resistor 5Gohm 2W 1
$19.70
quality
New Brand No66K6879 Ohmite Sm204031007Fe Thick Film Resistor 1Gohm 2W 1
New Brand No66K6879 Ohmite Sm204031007Fe Thick Film Resistor 1Gohm 2W 1
$19.70
quality
New Brand No64K9777 Ohmite 825F75Re Wirewound Resistor 75 Ohm 25W 1
New Brand No64K9777 Ohmite 825F75Re Wirewound Resistor 75 Ohm 25W 1
$21.36
quality
New Brand No64K7878 Ohmite 13Fpr050E Current Sense Resistor 005 Ohm 3W 1
New Brand No64K7878 Ohmite 13Fpr050E Current Sense Resistor 005 Ohm 3W 1
$20.83
quality
New Brand No64K3700 Ohmite B12J15Re Wirewound Resistor 15 Ohm 12W 5
New Brand No64K3700 Ohmite B12J15Re Wirewound Resistor 15 Ohm 12W 5
$19.88
quality
New Brand No64K3799 Ohmite B20J650E Wirewound Resistor 650 Ohm 20W 5
New Brand No64K3799 Ohmite B20J650E Wirewound Resistor 650 Ohm 20W 5
$20.93
quality
New Brand No51M1830 Ohmite Sm108035006Fe Thick Film Resistor 05Gohm 2W 1
New Brand No51M1830 Ohmite Sm108035006Fe Thick Film Resistor 05Gohm 2W 1
$19.70
quality
New Brand No51M1835 Ohmite Sm204031004Je Thick Film Resistor 1Mohm 325W 5
New Brand No51M1835 Ohmite Sm204031004Je Thick Film Resistor 1Mohm 325W 5
$19.79
quality
New Brand No65K0658 Ohmite 95J500E Wirewound Resistor 500 Ohm 5W 5
New Brand No65K0658 Ohmite 95J500E Wirewound Resistor 500 Ohm 5W 5
$19.89
quality
New Brand No49X0255 Ohmite Ey473Ke Resistor Ceramic 47Kohm 25W 10 Axial
New Brand No49X0255 Ohmite Ey473Ke Resistor Ceramic 47Kohm 25W 10 Axial
$20.59
quality
New Brand No64K6831 Ohmite Tdh35P7R50Je Thick Film Resistor 75 Ohm 35W 5
New Brand No64K6831 Ohmite Tdh35P7R50Je Thick Film Resistor 75 Ohm 35W 5
$23.45
quality
New Brand No65K0567 Ohmite 95J1R2E Wirewound Resistor 12 Ohm 5W 5
New Brand No65K0567 Ohmite 95J1R2E Wirewound Resistor 12 Ohm 5W 5
$19.56
quality
New Brand No94M9548 Ohmite Sm104031004Fe Resistor 1Mohm 15W 1 Radial
New Brand No94M9548 Ohmite Sm104031004Fe Resistor 1Mohm 15W 1 Radial
$22.05
quality
New Brand No49X0247 Ohmite Ey180Ke Resistor Ceramic 18Ohm 25W 10 Axial
New Brand No49X0247 Ohmite Ey180Ke Resistor Ceramic 18Ohm 25W 10 Axial
$20.59
quality
New Brand No49X0254 Ohmite Ey472Ke Resistor Ceramic 47Kohm 25W 10 Axial
New Brand No49X0254 Ohmite Ey472Ke Resistor Ceramic 47Kohm 25W 10 Axial
$20.59
quality
New Brand No64K4429 Ohmite E300K3R1E Resistor Power 31 Ohm 300W 10
New Brand No64K4429 Ohmite E300K3R1E Resistor Power 31 Ohm 300W 10
$58.02
quality
Ohmite Hvc0805Z5006Jet Resistor Wraparound500Mohm 125Mw 5
Ohmite Hvc0805Z5006Jet Resistor Wraparound500Mohm 125Mw 5
$20.24
quality
New Brand No88W4354 Ohmite Ba232010R0Ke Wirewound Resistor 10 Ohm 10 Radial
New Brand No88W4354 Ohmite Ba232010R0Ke Wirewound Resistor 10 Ohm 10 Radial
$84.70
quality
New Brand No66K6871 Ohmite Sm102031007Fe Thick Film Resistor 1Gohm 15W 1
New Brand No66K6871 Ohmite Sm102031007Fe Thick Film Resistor 1Gohm 15W 1
$18.93
quality
New Brand No73K3416 Ohmite Sm104034005Fe Thick Film Resistor 40Mohm 15W 1
New Brand No73K3416 Ohmite Sm104034005Fe Thick Film Resistor 40Mohm 15W 1
$19.09
quality
New Brand No49X0242 Ohmite Ey104Ke Resistor Ceramic 100Kohm 25W 10 Axial
New Brand No49X0242 Ohmite Ey104Ke Resistor Ceramic 100Kohm 25W 10 Axial
$20.59
quality
New Brand No18M5368 Ohmite Tn15P100Rge Thin Film Resistor 100 Ohm 15W 2
New Brand No18M5368 Ohmite Tn15P100Rge Thin Film Resistor 100 Ohm 15W 2
$23.25
quality
2X New Brand No64K8932 Ohmite 43F27Re Wirewound Resistor 27 Ohm 3W 1
2X New Brand No64K8932 Ohmite 43F27Re Wirewound Resistor 27 Ohm 3W 1
$19.55
quality
2X New Brand No64K7967 Ohmite 20J10Re Wirewound Resistor 10 Ohm 10W 5
2X New Brand No64K7967 Ohmite 20J10Re Wirewound Resistor 10 Ohm 10W 5
$19.44
quality
2X New Brand No64K8275 Ohmite 25J2K5E Wirewound Resistor 25Kohm 5W 5
2X New Brand No64K8275 Ohmite 25J2K5E Wirewound Resistor 25Kohm 5W 5
$19.19
quality
New Brand No64K3760 Ohmite B20J100E Wirewound Resistor 100 Ohm 20W 5
New Brand No64K3760 Ohmite B20J100E Wirewound Resistor 100 Ohm 20W 5
$20.72
quality
New Brand No64K3774 Ohmite B20J25Re Wirewound Resistor 25 Ohm 20W 5
New Brand No64K3774 Ohmite B20J25Re Wirewound Resistor 25 Ohm 20W 5
$21.23
quality
New Brand No64K6749 Ohmite Tbh25P5R60Je Thick Film Resistor 56 Ohm 25W 5
New Brand No64K6749 Ohmite Tbh25P5R60Je Thick Film Resistor 56 Ohm 25W 5
$21.23
quality
New No87K0115 Ohmite Mox92021005Fve Resistor High Voltage 10Mohm 5W 1
New No87K0115 Ohmite Mox92021005Fve Resistor High Voltage 10Mohm 5W 1
$31.80
quality
New Brand No64K3685 Ohmite B12J1K5E Wirewound Resistor 15Kohm 12W 5
New Brand No64K3685 Ohmite B12J1K5E Wirewound Resistor 15Kohm 12W 5
$20.17
quality
2X New Brand No64K8331 Ohmite 25J800E Wirewound Resistor 800 Ohm 5W 5
2X New Brand No64K8331 Ohmite 25J800E Wirewound Resistor 800 Ohm 5W 5
$19.03
quality
2X New Brand No64K8007 Ohmite 20J5R0E Wirewound Resistor 5 Ohm 10W 5
2X New Brand No64K8007 Ohmite 20J5R0E Wirewound Resistor 5 Ohm 10W 5
$19.59
quality
2X New Brand No64K8088 Ohmite 2133E Lug For Adjustable Resistor
2X New Brand No64K8088 Ohmite 2133E Lug For Adjustable Resistor
$20.14
quality
2X New Brand No64K9105 Ohmite 45F25Ke Wirewound Resistor 25Kohm 5W 1
2X New Brand No64K9105 Ohmite 45F25Ke Wirewound Resistor 25Kohm 5W 1
$20.63
quality
New Brand No64K3729 Ohmite B12J40Re Wirewound Resistor 40 Ohm 12W 5
New Brand No64K3729 Ohmite B12J40Re Wirewound Resistor 40 Ohm 12W 5
$19.88
quality
2X New Brand No64K8709 Ohmite 41F500E Wirewound Resistor 500 Ohm 1W 1
2X New Brand No64K8709 Ohmite 41F500E Wirewound Resistor 500 Ohm 1W 1
$20.20
quality
2X New Brand No64K8670 Ohmite 41F120E Wirewound Resistor 120 Ohm 1W 1
2X New Brand No64K8670 Ohmite 41F120E Wirewound Resistor 120 Ohm 1W 1
$19.89
quality
2X New Brand No64K8186 Ohmite 23J2K2E Wirewound Resistor 22Kohm 3W 5
2X New Brand No64K8186 Ohmite 23J2K2E Wirewound Resistor 22Kohm 3W 5
$18.99
quality
2X New Brand No64K8013 Ohmite 20J62Re Wirewound Resistor 62 Ohm 10W 5
2X New Brand No64K8013 Ohmite 20J62Re Wirewound Resistor 62 Ohm 10W 5
$19.44
quality
New Brand No51R4534 Ohmite Teh100M2R00Fe Thick Film Resistor 2 Ohm 100W 1
New Brand No51R4534 Ohmite Teh100M2R00Fe Thick Film Resistor 2 Ohm 100W 1
$26.04
quality
New Brand No64K3628 Ohmite Ay33Gke Resistor Ceramic 33 Ohm 45W 10
New Brand No64K3628 Ohmite Ay33Gke Resistor Ceramic 33 Ohm 45W 10
$39.07
quality
New Brand No65K0574 Ohmite 95J100E Wirewound Resistor 100 Ohm 5W 5
New Brand No65K0574 Ohmite 95J100E Wirewound Resistor 100 Ohm 5W 5
$19.58
quality
New Brand No51M1776 Ohmite Sm104032007Fe Thick Film Resistor 2Gohm 15W 1
New Brand No51M1776 Ohmite Sm104032007Fe Thick Film Resistor 2Gohm 15W 1
$19.09
quality
New Brand No64K6756 Ohmite Tch35Pr220Je Thick Film Resistor 022 Ohm 35W 5
New Brand No64K6756 Ohmite Tch35Pr220Je Thick Film Resistor 022 Ohm 35W 5
$24.16
quality
New Brand No64K6797 Ohmite Tch35P75R0Je Thick Film Resistor 75 Ohm 35W 5
New Brand No64K6797 Ohmite Tch35P75R0Je Thick Film Resistor 75 Ohm 35W 5
$21.90
quality
New Brand No18M5087 Ohmite Mc102825005Je Thick Film Resistor 50Mohm 15W 5
New Brand No18M5087 Ohmite Mc102825005Je Thick Film Resistor 50Mohm 15W 5
$19.30
quality
New Brand No64K4248 Ohmite D225K10Ke Wirewound Resistor 10Kohm 225W 10
New Brand No64K4248 Ohmite D225K10Ke Wirewound Resistor 10Kohm 225W 10
$48.90
quality
New Brand No49X0257 Ohmite Ey681Ke Resistor Ceramic 680 Ohm 25W 10 Axial
New Brand No49X0257 Ohmite Ey681Ke Resistor Ceramic 680 Ohm 25W 10 Axial
$20.59
quality
New Brand No49X0248 Ohmite Ey270Ke Resistor Ceramic 27Ohm 25W 10 Axial
New Brand No49X0248 Ohmite Ey270Ke Resistor Ceramic 27Ohm 25W 10 Axial
$20.59
quality
New Brand No65K0070 Ohmite 850F25Ke Wirewound Resistor 25Kohm 50W 1
New Brand No65K0070 Ohmite 850F25Ke Wirewound Resistor 25Kohm 50W 1
$24.50
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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