Amprobe 5XP-A Manual de usuario

V1.0 V1.0

QUICK GUIDE

Resistance diagnostics

for troubleshooting vibrating wire

sensors and cables

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INTRODUCTION

Where damage to a sensor or cable is suspected this guide illustrates the way in which simple

resistance checks can be taken to identify the possible cause of the problem.

Resistance checks can be made with most types of multi-meter which are readily available in the

market.

RESISTANCE OF THE COILS

STEP 1

Set the range to 200Ω or Ω if using a multi-meter which has automatic ranging.

STEP 2

Connect the VW+ (red) conductor to the red lead on the multi-meter and the

VW- (black) to the black lead on the multi-meter.

The correct readings should be as follows ±10%

Pressure Transducer ~ 160Ω

Strain gauge ~ 180Ω

Co-axial coil ~ 50Ω

IF THE VALUES ARE OUT OF THESE RANGES THEN THERE IS A FAULT IN THE COILS

IF THE VALUES ARE 50% THEN THERE IS A PROBLEM WITH ONE OF THE COILS

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RESISTANCE OF THE THERMISTOR

STEP 1

Set the range to 20kΩ or Ω if using a multi-meter which has automatic ranging.

STEP 2

Connect the T+ (green) conductor to the red lead on the multi-meter and the T- (white) to the black

lead on the multi-meter.

The readings will be dependent on the temperature as below:-

10°C ~ 5.971kΩ (5971Ω)

15°C ~ 4.714kΩ (4714Ω)

20°C ~ 3.478kΩ (3478Ω)

25°C ~ 3.000kΩ (3000Ω)

PLEASE REFER TO THE THERMISTOR LOOK UP TABLE ON PAGE 4

IF THESE VALUES DIFFER THEN THERE IS A PROBLEM WITH THE THERMISTOR OR IT’S

CONDUCTORS

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Ohms Temp Ohms Temp Ohms Temp Ohms Temp Ohms Temp

201.1K -50 16.60K -10 2417 30 525.4 70 153.2 110

187.3K -49 15.72K -92317 31 507.8 71 149.0 111

174.5K -48 14.90K -82221 32 490.9 72 145.0 112

162.7K -47 14.12K -72130 33 474.7 73 141.1 113

151.7K -46 13.39K -62042 34 459.0 74 137.2 114

141.6K -45 12.70K -51959 35 444.0 75 133.6 115

132.2K -44 12.05K -41880 36 429.5 76 130.0 116

123.5K -43 11.44K -31805 37 415.6 77 126.5 117

115.4K -42 10.86K -21733 38 402.2 78 123.2 118

107.9K -41 10.31K -11664 39 389.3 79 119.9 119

101.0K -40 9796 01598 40 376.9 80 116.8 120

94.48K -39 9310 11535 41 364.9 81 113.8 121

88.46K -38 8851 21475 42 353.4 82 110.8 122

82.87K -37 8417 31418 43 342.2 83 107.9 123

77.66K -36 8006 41363 44 331.5 84 105.2 124

72.81K -35 7618 51310 45 321.2 85 102.5 125

68.30K -34 7252 61260 46 311.3 86 99.9 126

64.09K -33 6905 71212 47 301.7 87 97.3 127

60.17K -32 6576 81167 48 292.4 88 94.9 128

56.51K -31 6265 91123 49 283.5 89 92.5 129

53.10K -30 5971 10 1081 50 274.9 90 90.2 130

49.91K -29 5692 11 1040 51 266.6 91 87.9 131

46.94K -28 5427 12 1002 52 258.6 92 85.7 132

44.16K -27 5177 13 965.0 53 250.9 93 83.6 133

41.56K -26 4939 14 929.6 54 243.4 94 81.6 134

39.13K -25 4714 15 895.8 55 236.2 95 79.6 135

36.86K -24 4500 16 863.3 56 229.3 96 77.6 136

34.73K -23 4297 17 832.2 57 222.6 97 75.8 137

32.74K -22 4105 18 802.3 58 216.1 98 73.9 138

30.87K -21 3922 19 773.7 59 209.8 99 72.2 139

29.13K -20 3748 20 746.3 60 203.8 100 70.4 140

27.49K -19 3583 21 719.9 61 197.9 101 68.8 141

25.95K -18 3426 22 694.7 62 192.2 102 67.1 142

24.51K -17 3277 23 670.4 63 186.8 103 65.5 143

23.16K -16 3135 24 647.1 64 181.5 104 64.0 144

21.89K -15 3000 25 624.7 65 176.4 105 62.5 145

20.70K -14 2872 26 603.3 66 171.4 106 61.1 146

19.58K -13 2750 27 582.6 67 166.7 107 59.6 147

18.52K -12 2633 28 562.8 68 162.0 108 58.3 148

17.53K -11 2523 29 543.7 69 157.6 109 56.8 149

THERMISTOR LOOK UP TABLE

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RESISTANCE OF ALL INDIVIDUAL CONDUCTORS

STEP 1

Set the range to 20kΩ or Ω if using a multi-meter which has automatic ranging.

STEP 2

All pairs of conductors should be checked by connecting to the red and black leads on the multi-

meter as follows:-

Red & black

Green & white

A value of O.L (open loop) means that there is a high/infinite resistance and therefore it is

likely that the cable has been cut.

If one of the above pairs is OK then check the individual conductors against the earth.

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