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How do AC Current clamp ampere meters work?

I heard variation of the magnetic field around the wire inducts a current in the clamp, but in that case wouldn`t the measured current be highly dependent on the position of the wire in the clamp and its orientation??
I know that DJm but as I said "wouldn`t the measured current be highly dependent on the position of the wire in the clamp and its orientation??"

They work by induction

You know from magnetism courses that magnetic fields are created by changing currents

So the magnetic field around a wire with AC in it is always changing up and down..
The Clamp amp meter has a coil in it.. It uses the other principle of electro magnetism that if a wire is placed in a changing magnetic field then the current in the wire is proportional to the change in the magnetic field.

Simply put its a TRANSFORMER ...


Check Ebay for Clamp Meters products. Ebay can be a great resource for finding most anything you desire!

AC current 1000amp Digital Clamp Meter Reader
AC current 1000amp Digital Clamp Meter Reader
$18.99
Time Remaining: 9d 12h 53m
Buy It Now for only: $18.99

Fluke 376 True rms AC DC Clamp Meter with iFlex
Fluke 376 True rms AC DC Clamp Meter with iFlex
$250.00
Time Remaining: 6h 10m
Buy It Now for only: $325.00

IDEAL Model 61 746 Clamp Pro Multimeter w True RMS w case EXCELLENT CONDITION
IDEAL Model 61 746 Clamp Pro Multimeter w True RMS w case EXCELLENT CONDITION
$31.00 (4 Bids)
Time Remaining: 10h 7m

Klein CL2000 400A AC DC TRMS Clamp Meter New without package
Klein CL2000 400A AC DC TRMS Clamp Meter New without package
$59.99
Time Remaining: 5d 11h 39m
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fluke clamp meter
fluke clamp meter
$150.00 (1 Bid)
Time Remaining: 10h 10m

Fluke 36 True RMS Clamp Meter AS IS
Fluke 36 True RMS Clamp Meter AS IS
$11.01 (3 Bids)
Time Remaining: 12h 27m

Digital Clamp Meter 266 Accessories Available 500V Insulation Tester Unit DT 266
Digital Clamp Meter 266 Accessories Available 500V Insulation Tester Unit DT 266
$14.99
Time Remaining: 18d 11h 5m
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Klein Tools CL 2000 True RMS Auto Ranging Clamp Meter NEW NO RESERVE
Klein Tools CL 2000 True RMS Auto Ranging Clamp Meter NEW NO RESERVE
$16.50 (9 Bids)
Time Remaining: 1d 17h 58m

Fluke i1010 AC DC CURRENT CLAMP
Fluke i1010 AC DC CURRENT CLAMP
$150.00 (1 Bid)
Time Remaining: 16h 46m

High Accuracy UT202 Digital Clamp Multimeters DMM DCV ACV Auto Range Temperature
High Accuracy UT202 Digital Clamp Multimeters DMM DCV ACV Auto Range Temperature
$27.88
Time Remaining: 27d 2h 40m
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FLUKE 30 CLAMP METER 200A 400A 200ohm 200  600 volt settings
FLUKE 30 CLAMP METER 200A 400A 200ohm 200 600 volt settings
$19.90
Time Remaining: 2d 12h 35m
Buy It Now for only: $39.00

Tenma Digital Clamp Meter No Reserve Model 72 7222
Tenma Digital Clamp Meter No Reserve Model 72 7222
$3.25 (3 Bids)
Time Remaining: 19h 28m

PYLE CAR STEREO PCTL01 NEW PIPE CLAMP TEMPERATURE LEAD MEASURE W 40 INCH CORD
PYLE CAR STEREO PCTL01 NEW PIPE CLAMP TEMPERATURE LEAD MEASURE W 40 INCH CORD
$17.45
Time Remaining: 29d 6h 43m
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Fluke Model 321 Professional 400Amp Clamp Meter with Leads
Fluke Model 321 Professional 400Amp Clamp Meter with Leads
$52.00 (14 Bids)
Time Remaining: 10h 5m

FLUKE 376 TRUE RMS AC DC CLAMP METER WITH IFLEX
FLUKE 376 TRUE RMS AC DC CLAMP METER WITH IFLEX
$22.50 (4 Bids)
Time Remaining: 2d 14h 6m

CP 07A AC DC Extreme Low current clamp probe  100uA
CP 07A AC DC Extreme Low current clamp probe 100uA
$179.99
Time Remaining: 17d 17h 58m
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Fluke 322 Clamp Meter AS IS
Fluke 322 Clamp Meter AS IS
$0.99
Time Remaining: 1d 12h 5m

Fluke 353 True rms 2000 A Clamp Meter
Fluke 353 True rms 2000 A Clamp Meter
$0.99 (1 Bid)
Time Remaining: 2d 14h 19m

MUELLER 60 SERIS ALLIGATOR CLAMPS 10 AMP COPPER 4MM FEMALE ENDS
MUELLER 60 SERIS ALLIGATOR CLAMPS 10 AMP COPPER 4MM FEMALE ENDS
$3.79
Time Remaining: 19d 7h 15m
Buy It Now for only: $3.79

Fluke 321 Digital Clamp Meter Current Meter NR
Fluke 321 Digital Clamp Meter Current Meter NR
$31.05 (8 Bids)
Time Remaining: 14h 52m

Non Contact Voltage Alert Tester 90 1000V AC Pen LED Lt
Non Contact Voltage Alert Tester 90 1000V AC Pen LED Lt
$2.68
Time Remaining: 2d 20h 33m
Buy It Now for only: $2.68

Fluke 321 Digital Clamp Meter Current Meter NR
Fluke 321 Digital Clamp Meter Current Meter NR
$31.00 (6 Bids)
Time Remaining: 14h 52m

Fluke 336 True RMS clamp meter Used 99C with no reserve 336a Multimeter
Fluke 336 True RMS clamp meter Used 99C with no reserve 336a Multimeter
$20.50 (4 Bids)
Time Remaining: 2d 32m

New AC DC Digital Multimeter Electronic Clamp Meter
New AC DC Digital Multimeter Electronic Clamp Meter
$8.99
Time Remaining: 9d 23h 13m
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Amprobe Amp Clamp
Amprobe Amp Clamp
$7.99 (2 Bids)
Time Remaining: 2d 17h 8m

AC DC True RMS Clamp on Ammeter Multimeter+Capacitor Tester+Type K Thermocouple
AC DC True RMS Clamp on Ammeter Multimeter+Capacitor Tester+Type K Thermocouple
$49.97
Time Remaining: 5h 42m

Ammeter Volt Ohm Amp Meter DMM+Capacitor Tester Type K Thermocouple AC HVAC Tool
Ammeter Volt Ohm Amp Meter DMM+Capacitor Tester Type K Thermocouple AC HVAC Tool
$24.77
Time Remaining: 25d 10h 42m
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Klein Tools CL 2000 True RMS Auto Ranging Clamp Meter NEW NO RESERVE
Klein Tools CL 2000 True RMS Auto Ranging Clamp Meter NEW NO RESERVE
$61.00 (13 Bids)
Time Remaining: 18h 4m

KLEIN TOOLS CL1000 400A AC CLAMP METER NEW
KLEIN TOOLS CL1000 400A AC CLAMP METER NEW
$51.00 (13 Bids)
Time Remaining: 7h 13m
Buy It Now for only: $80.00

New LCD Digital Multimeter Electronic Tester AC DC CLAMP Meter tool
New LCD Digital Multimeter Electronic Tester AC DC CLAMP Meter tool
$19.99
Time Remaining: 13d 5h 24m
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Fluke 902 True RMS HVAC Clamp Meter Pristine Condition
Fluke 902 True RMS HVAC Clamp Meter Pristine Condition
$100.00 (1 Bid)
Time Remaining: 2d 6h 21m

2 GE HANDHELD CLAMP METER MULTIMETER 942D WITH LEADS USED
2 GE HANDHELD CLAMP METER MULTIMETER 942D WITH LEADS USED
$19.99
Time Remaining: 11h 24m

GARDNER BENDER GB INSTRUMENTS DIGITAL CLAMP METER 600AMP GCM 221
GARDNER BENDER GB INSTRUMENTS DIGITAL CLAMP METER 600AMP GCM 221
$29.29
Time Remaining: 27d 9h 51m
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Fluke 376 True RMS AC DC Clamp Meter NO RESERVE
Fluke 376 True RMS AC DC Clamp Meter NO RESERVE
$21.71 (3 Bids)
Time Remaining: 5d 12h 28m

FLUKE 376 TRUE rms AC DC CLAMP METER W iFLEX NEW IN BOX FREE SHIPPING
FLUKE 376 TRUE rms AC DC CLAMP METER W iFLEX NEW IN BOX FREE SHIPPING
$114.84 (13 Bids)
Time Remaining: 4d 10h 50m

Non Contact Voltage Detector Alert 90 1000V AC Pen
Non Contact Voltage Detector Alert 90 1000V AC Pen
$2.99
Time Remaining: 4d 20h 20m
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Klein Tools 400A AC DC TRMS Clamp Meter CL2000 BRAND NEW IN PACKAGE
Klein Tools 400A AC DC TRMS Clamp Meter CL2000 BRAND NEW IN PACKAGE
$89.99 (1 Bid)
Time Remaining: 7h 43m

++Fluke Clamp Meter 902+++NEW+++True rms HVAC+++
++Fluke Clamp Meter 902+++NEW+++True rms HVAC+++
$99.95
Time Remaining: 3d 6h 20m

AC DC Electrical Digital Multimeter Digital Clamp Meter Tester Tool with Proble
AC DC Electrical Digital Multimeter Digital Clamp Meter Tester Tool with Proble
$29.99
Time Remaining: 13d 19h 27m
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Ideal 61 763 Tightsight Clamp Meter 660A AC TRMS Meter
Ideal 61 763 Tightsight Clamp Meter 660A AC TRMS Meter
$69.00
Time Remaining: 13h 45m

LCD Auto Digital Multimeter Electronic Tester AC DC Clamp Meter
LCD Auto Digital Multimeter Electronic Tester AC DC Clamp Meter
$108.45
Time Remaining: 9d 19h 59m
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UEI DL 90A Digital Clamp Meter NR
UEI DL 90A Digital Clamp Meter NR
$0.99
Time Remaining: 2d 13h 4m

Fluke 322 400 Amp AC Clamp Meter Tester with Leads NO RESERVE
Fluke 322 400 Amp AC Clamp Meter Tester with Leads NO RESERVE
$25.00 (8 Bids)
Time Remaining: 5d 12h 28m

New Fluke 362 Detachable Jaw True rms AC DC Clamp Meter
New Fluke 362 Detachable Jaw True rms AC DC Clamp Meter
$99.88
Time Remaining: 8d 2h 33m
Buy It Now for only: $99.88

GREENLEE CM600
GREENLEE CM600
$5.00 (3 Bids)
Time Remaining: 11h 22m

Amprobe ACDC 100 TRMS AC DC CLAMP ON TRMS VERSION
Amprobe ACDC 100 TRMS AC DC CLAMP ON TRMS VERSION
$0.99 (1 Bid)
Time Remaining: 1d 22h 2m

Clamp Meter High Resolution DC AC 1mA23mm Jaw SE 02
Clamp Meter High Resolution DC AC 1mA23mm Jaw SE 02
$51.99
Time Remaining: 14d 20h 20m
Buy It Now for only: $51.99

DT3352 1500A AC DC Watt Resistance Capacitance Frequency Clamp on Meter True RMS
DT3352 1500A AC DC Watt Resistance Capacitance Frequency Clamp on Meter True RMS
$99.95 (1 Bid)
Time Remaining: 16h 46m

FLUKE 337 TRUE RMS CLAMP METER W CASE
FLUKE 337 TRUE RMS CLAMP METER W CASE
$31.00 (9 Bids)
Time Remaining: 4d 15h 29m

Type K Thermocouple Temperature Sensor HVAC Tool Part
Type K Thermocouple Temperature Sensor HVAC Tool Part
$5.77
Time Remaining: 15d 19h 48m
Buy It Now for only: $5.77

Fluke i200 200Amp AC Clamp Amp Meter Accessory
Fluke i200 200Amp AC Clamp Amp Meter Accessory
$49.99
Time Remaining: 5h 56m

IDEAL 61 763 CLAMP METER USED
IDEAL 61 763 CLAMP METER USED
$2.49 (5 Bids)
Time Remaining: 1d 12h 56m
Buy It Now for only: $79.00

IDEAL 400 AAC CLAMP METER 61 732
IDEAL 400 AAC CLAMP METER 61 732
$39.99
Time Remaining: 5d 19h 27m
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Fluke 322 Clamp Meter Tester With leads and Case
Fluke 322 Clamp Meter Tester With leads and Case
$50.00
Time Remaining: 4d 18h 6m

Ideal 61 766 Clamp on Meter 600 Amp
Ideal 61 766 Clamp on Meter 600 Amp
$51.00 (5 Bids)
Time Remaining: 1d 9h 34m

Portable AC DC Voltage LCD Mini DIGITAL Clamp Multimeter Electronic Tester Meter
Portable AC DC Voltage LCD Mini DIGITAL Clamp Multimeter Electronic Tester Meter
$10.79
Time Remaining: 2d 22h 44m
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Digital Clamp Ammeter Volt Amp Ohm Meter Multimeter DMM+K Thermocouple HVAC Tool
Digital Clamp Ammeter Volt Amp Ohm Meter Multimeter DMM+K Thermocouple HVAC Tool
$24.97 (1 Bid)
Time Remaining: 11h 32m

Fieldpiece SC67 Manual Ranging Clamp Meter NO RESERVE
Fieldpiece SC67 Manual Ranging Clamp Meter NO RESERVE
$0.99 (1 Bid)
Time Remaining: 5d 12h 29m

New UT204A ac dc ammeter high interest DE 600 A clamp ampere meter
New UT204A ac dc ammeter high interest DE 600 A clamp ampere meter
$43.88
Time Remaining: 21d 8h 6m
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FIELDPIECE SC76 TEMPERATURE CLAMP MULTIMETER MULTI METER HVAC TECHNICIAN TOOL
FIELDPIECE SC76 TEMPERATURE CLAMP MULTIMETER MULTI METER HVAC TECHNICIAN TOOL
$42.00 (17 Bids)
Time Remaining: 18h 55m


Another great resource for Clamp Meters products is Amazon. They have far more than just books!


Home Energy Saving Monitor Complete Unit with Transmitter


Home Energy Saving Monitor Complete Unit with Transmitter


$109.99


Everything you need to start monitoring your homes energy consumption. The kit includes: Display with power supply, 2 slip-on clamps. Transmitter with 7 year battery life, Installation manual. Kits come with everything you need. Saves Energy - Reduces Utility Bills. See in REAL-TIME how much electricity your whole home is using! Monitor displays energy use in Dollars and Kilowatts. Allows you to l...

Fieldpiece ST4 Dual Temperature Meter, -58 to 2000F(-50 to 1300C)


Fieldpiece ST4 Dual Temperature Meter, -58 to 2000F(-50 to 1300C)


$69.95


The Fieldpiece Dual-Temperature Meter, model ST4, measures two temperatures simultaneously using the included k-type, wrap tab beaded thermocouples. The technology inside the ST4 provides superior temperature compensation in rapidly changing environments commonly found while performing field service. Use the ST4 to find Delta T and just about any temperature split you want to measure. Displays T1,...

General Tools AT60LR Long Ring Analog Timer


General Tools AT60LR Long Ring Analog Timer


$8.21


...

SE Clip Test Lead Set (10 Piece)


SE Clip Test Lead Set (10 Piece)


$3.00


10 Pc Set, Color Coded vinyl covered alligator clips. Each clip is crimped to ensure a good conduction. Good quality clips that close well and a strong spring to keep it closed. 10 piece set contains two of each: Black, red, white, green, and yellow. 22 gauge heavy insulation copper wire, 12 in. length....

Fluke 1AC-A1-II Volt-Alert AC Non-Contact Voltage Tester


Fluke 1AC-A1-II Volt-Alert AC Non-Contact Voltage Tester


$18.00


Simply touch the tip to a terminal strip, outlet or cord. When the tip glows red, and the unit beeps, you know there's voltage in the line. Electricians, maintenance, service, safety personnel can quickly test for energized circuits and defective grounds on the factory floor, in the shop. Continually tests its battery and its circuit integrity with a periodic double flash visual indication using F...

Schumacher BT-100 100 amp Battery Load Tester


Schumacher BT-100 100 amp Battery Load Tester


$28.04


Schumacher Bt100 Battery Load Tester...

PurEnema Silicone Enema Parts | Fits all standard enema buckets | 1 Enema Nozzle, 1 meter Colon Tube, 2 meter Enema Tubing, 1 enema clamp + 1 FREE Retention Enema Nozzle


PurEnema Silicone Enema Parts | Fits all standard enema buckets | 1 Enema Nozzle, 1 meter Colon Tube, 2 meter Enema Tubing, 1 enema clamp + 1 FREE Retention Enema Nozzle


$27.95


PurEnema Silicone Enema Parts by Seeking Health provides safety, purity, comfort, style, functionality and durability. All tubing and nozzles can be easily sterilized and reused. They are made from 100% medical-grade silicone and fits all standard enema buckets. Includes : Silicone Enema Tubing with pinch clamp, Silicone Colon Tube, Straight Nozzle and Retention Nozzle....

Fieldpiece ATC1 Pipe Clamp (1 3/8)


Fieldpiece ATC1 Pipe Clamp (1 3/8)


$45.86


The ATC1, K-type, pipe clamp thermocouple is used to take temperatures of pipes or any other cylindrical surface within its 3/8" to 1 3/8" jaw range. Using a pipe clamp thermocouple greatly facilitates taking superheat or subcooling measurements. Use the ATC1 for most A/C units. The ATC1 can be used with any of our meters that measure temperature and any thermometer accepting a K-type thermocouple...

Solarcon I-MAX 2000 CB/Ham Radio Base Station Vertical Antenna - 24'


Solarcon I-MAX 2000 CB/Ham Radio Base Station Vertical Antenna - 24'


$99.18


Solarcon IMAX-2000 24ft Omni-Directional Fiberglass Base Station Antenna 5000 Watts....

Fieldpiece LT17A Classic Style Digital Multimeter w/Temp, MFD, Microamps, Frequency


Fieldpiece LT17A Classic Style Digital Multimeter w/Temp, MFD, Microamps, Frequency


$122.02


The LT17A is the classic style meter. This manual ranger covers most of the parameters and ranges you need for most HVAC/R applications. The LT17A meter measures current, resistance, voltage, capacitance, frequency, continuity, and temperature. Test leads store in the meter body and, with the probe tips removed, connect the LT17A to Fieldpiece accessory heads. The body is made out of durable ABS p...


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