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AMP-320 600A AC/DC TRMS Motor Maintenance Clamp Meter

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AMP-320 TRMS Motor Maintenance Clamp Meter front view
AMP-320 TRMS Motor Maintenance Clamp Meter front view
AMP-320 TRMS Motor Maintenance Clamp Meter angled view
AMP-320 TRMS Motor Mainteance Clamp Meter testing small diameter wire with Amp-Tip function
AMP-320 TRMS Motor Mainteance Clamp Meter testing motor

Whether you need an amp clamp for HVAC, general electrical or motor testing applications, the AMP-320 Clamp Meter, with its large backlit display, has the features you need. HVAC technicians will find the temperature and capacitance measurements they need plus DC Microamps for testing flame sensors. It also had core motor testing capabilities such as motor rotation, 3-phase sequence testing, and inrush current measurement for motor start-up monitoring. The low pass filter allows you to accurately measure current and voltage on variable frequency drives. The Amp-Tip function allows for precise measurement of current down to the tenth of an Amp, enabling accurate current measurement of both large and small diameter wires. It also offers a full range of standard multimeter features, including AC/DC current, AC/DC voltage, frequency, True-RMS, non-contact voltage detection, resistance, continuity and a CAT III 600 V safety rating.

AMP-320 600A AC/DC TRMS Motor Maintenance Clamp Meter is rated 4.7 out of 5 by 14.
Rated 5 out of 5 by from This is the best product on the market! Great tool makes my life so much easier I recommend it to anyone! This is the best product on the market! Great tool makes my life so much easier I recommend it to anyone!
Date published: 2018-09-16
Rated 5 out of 5 by from Best amp clamp ever! Works accurately and quickly... also has been sturdy and reliable, would recommend this clamp for sure!
Date published: 2018-09-15
Rated 5 out of 5 by from Easy to use Easy to use for motor applications also great for trouble shooting.
Date published: 2018-09-12
Rated 5 out of 5 by from Excellent tool with affordable price. I have used mine for a while. Exceptional quality it is made very durable , and as a industrial electrician/controls technician I work in very harsh and demanding environments. The meter is great for trouble shooting anything from a light switch in your house to a three phase motor in a plant. This meter has allowed me to commission and trouble shoot more times than I can count. I highly reccomend this product to other people who work with electricity.
Date published: 2018-09-11
Rated 5 out of 5 by from Nothing else like it anywhere! I am a Senior Master RV Tech. I work on HVAC, AC/DC power, generators, inverters, converters, engine and drivetrain, you name it. Just finding a quality DC ammeter is difficult enough. Finding one with so many features at such an attractive price point is a dream come true. First, it comes in a handy case that keeps all of the included accessories secure and organized. Next, it fits in my hand like it grew there. Easy one had operation. Love that! The screen is backlit for those cramped, dark spaces. The small wire notch gives more accurate readings on the little stuff. True RMS lets you accurately diagnose issues. No, I haven't given up my other dedicated instruments, but this little machine can serve as an all in one for the budget conscious, or for when you need to pack light. It is thin and narrow enough to fit in tight spaces and fit in any tool bag. Best clamp on I have ever owned!
Date published: 2018-09-02
Rated 5 out of 5 by from Replacement for a T5 Out of the package tester looks and feel like a quality instrument. After a few minutes of review all functions worked great. Took it to work and started on standard trouble shooting. Backlit display is great, for testing in ceiling. Look forward to many years of use. Bill.M Electrician, IBEW
Date published: 2018-08-24
Rated 4 out of 5 by from great HVAC meter, with a couppe exceptions Good meter, and I plan to keep and use it but with some minor mods it COULD be the ultimate HVAC meter. 1-the capacitance tester function needs a 1/10 digit for the most accurate reading. For example a 10mf capacitor on a meter with a 1/10 digit may read 9.56 and be below the 6% min spec and should be replaced, this meter will just read 9.6 as it'll round up. 2- meter should have a Millivolt option for thermocouples and thermopiles. 3-a magnet is an often overlooked but super valued thing to have for easier hands free troubleshooting. 4-a lead holder on the amp clamp so you can hold your meter as you take readings around circuitry, plus lead storage would be good. 5-a fuse! I've never blown up a meter but better safe than sorry! I would be willing to invest more in a meter that has these things plus what the amp-320 already has. Having said these, I'm enjoying the meter, especially 3 phase mode.
Date published: 2017-10-27
Rated 5 out of 5 by from Great Bang For The Buck! Lightweight, compact, feature rich, easy to use, ergonomic, durable, quality construction, precise, affordable. All traits that are desirable and included, at no extra charge, with this meter. The Amprobe AMP-320 is a piece of test equipment that feels good in your hands. A tool you can be proud to show off to your buddies with pride. Its no BS precision ensures my safety as well as allows me to get my job done quickly with no guesswork. I wish it were made in the US, but made in Taiwan sure beats made in China in my book. The user manual is well written, with clear illustrations. The extra accessories included were a nice bonus, and much appreciated. I don't know why you are still reading my review. Go out and get one for yourself... now.
Date published: 2016-05-26
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  • Measures AC/DC Current to 600 A and AC/DC Voltage to 600 V
  • Measures temperature from -40° to 752°F, (-40° to 400°C)
  • Measures DC Microamps output to test proper operation of the flame sensor on gas appliances
  • Measures capacitance, test diodes, and features a continuity beeper
  • Tests 3-phase sequence and motor rotation to ensure proper connection of a motor to a 3-phase system
  • Monitors inrush current during motor start-up
  • Features True-RMS sensing for accurate voltage measurements in noisy electrical environments
  • Amp-Tip function delivers precise low AC current measurements – 0 to 60 A
  • Includes a low pass filter to accurately measure voltage and current on variable frequency drives
  • Provides resistance and continuity measurement capabilities to verify the quality of electrical connections and the proper operation of motor and transformer coils
  • Provides data hold, relative zero, and MAX/MIN/AVG mode for quick analysis
  • Maximizes battery life with auto power off and low battery indicator
  • Backlit display for easy measurement viewing in bright and dim environments
  • CAT III 600 V safety rated
  • Accommodates conductors up to 1.37 inches (35 mm)
  • Includes test leads, batteries (installed), alligator clip set, banana plug K-type thermocouple, carrying case, and user manual
FEATURE AMP-210 AMP-220 AMP-310 AMP-320 AMP-330
AC voltage (True-rms) Range: 0 to 600.0 V 0 to 1000.0 V
Accuracy: ±1.0% + 5LSD (50 to 60 Hz) ±0.8% + 5LSD (50 to 60 Hz)
DC voltage Range: 0 to 600.0 V
Accuracy: ±1.0% + 5LSD
AC+DC voltage Range: 0 to 600.0 V 0 to 600.0 V 0 to 1000.0 V
Accuracy: ±1.2% + 7LSD (50 to 60 Hz) ±1.2% + 7LSD (50 to 60 Hz) ±1.0% + 7LSD (50 to 60 Hz)
±1.8% + 7LSD (DC 40 to 200 Hz)
±1.2% + 7LSD 200 to 400 Hz)
AC current Range: 0 to 600.0 A
Accuracy: ±1.8% + 5LSD (50 to 60 Hz)
±2.0% + 5LSD (100 to 400 Hz)
DC current Range: 0 to 600.0 A 0 to 600.0 A 0 to 1000.0 A
Accuracy: ±2.0% + 5LSD (DC 50 to 100 Hz) ±2.0% + 5LSD (DC 50 to 100 Hz) ±1.8% + 5LSD (DC 50 to 100 Hz)
AC+DC current Range: 0 to 600.0 A 0 to 600.0 A 0 to 1000.0 A
Accuracy: ±2.2% + 7LSD (DC 50 to 100 Hz)
±2.7% + 7LSD (100 to 400 Hz)
±2.2% + 7LSD (DC 50 to 100 Hz)
±2.7% + 7LSD (100 to 400 Hz)
±2.2% + 7LSD (40 to 100 Hz)
±2.5% + 7LSD (100 to 400 Hz)
Precise low current AC Range: 0 to 60.00 A
Accuracy: ±1.5% + 5LSD (50 to 60 Hz) ±1.5% + 5LSD (50 to 60 Hz)
±2.0% + 5LSD (0.00 to 20.00 A, 100 to 400 Hz)
±3.0% + 5LSD (>20.00 to 60.00 A, 40 to 100 Hz)
±3.0% + 5LSD (>20.00 to 60.00 A, 100 to 100 Hz)
Precise low current DC Range: 0 to 60.0 A 0 to 60.0 A 0 to 60.00 A
Accuracy: ±2.0% + 5LSD ±2.0% + 5LSD ±1.5% + 5LSD (0.00 to 20.00 A)
±3.0% + 5LSD (>20.00 to 60.00 A)
Micro amps Range: 0 to 2000 µA
Accuracy: ±1.0% + 5LSD
Frequency Range: 5.00 to 999.9 Hz
Accuracy: ±1.0% + 5LSD (600 V range)
Range: 50.0 to 400.0 Hz
Accuracy: ±2.0% + 4LSD (600 A range)
Resistance Range: 0.0 to 60.00 kΩ
Accuracy: ±1.0% + 5LSD
Capacitance Range: 0.0 to 2500 µF
Accuracy: ±2.0% + 4LSD
Continuity beeper ON ≤ 10 Ω
Off > 250 Ω
Temperature*
(Type K thermocouple)
  -40.0 to 752 °F
-40.0 to 400 °C
  ±1.0% + 3.0 °F (-40.0 to 14.0 °F)
±1.0% + 1.5 °F (>40.0 to 99.9 °F)
±1.0% + 2.0 °F (100 to 752 °F)
±1.0% + 1.5 °C (-40.0 to 10.0 °C)
±1.0% + 0.8 °C (>-10.0 to 99.9 °C)
±1.0% + 1.0 °C (100 to 400 °C)
Non-contact voltage 10 V to 1000 V AC (50 to 60 Hz)
Phase rotation indication   Rotation-R for main supply
Rotation-M for motors
Diode test  
Jaw opening   1.18 in (30 mm) 1.37 in (35 mm) 1.18 in (30 mm) 1.37 in (35 mm) 2.0 in (51 mm)
Safty rating   CAT III 600 V CAT IV 600V
CAT III 1000 V
Special Features
In-rush current  
Peak hold (Crest)  
Relative zero  
Max/Min/Avg  
Data hold  
Backlight  
Auto power off  
Work light  

*Error does not include Type-K thermocouple errors

For complete specs please download the product datasheet under the "Resources" tab.

Model NameDescriptionBuy it
AMP-320

AMP-320 600A AC/DC TRMS Motor Maintenance Clamp Meter

  • True-RMS
  • Voltage up to 600 V AC/DC, Current up to 600 A AC/DC, resistance and frequency
  • Temperature measurement from -40.0 to 752°F (-40.0 to 400°C)
  • Low pass filter for variable frequency drives
  • Amp-tip function for precise low current measurements down to the tenth of an Amp
  • Capacitance measurement for start and run motor capacitors
  • A third input terminal for 3-phase motor and phase rotation tests
  • DC Microamps output for measurement of flame sensors
  • Inrush current measurement for motor start-up monitoring
  • Non-contact voltage detection
  • Audible continuity and diode test
  • Data hold, relative zero, MAX/MIN/AVG
  • Large LCD backlit display
  • Accommodates conductors up to 1.37 in (35mm)
  • CAT III 600 V safety rated

Included Accessories: Banana Plug Type-K Thermocouple, Test Leads, Alligator Clip Set, (2) AAA Batteries (installed), User Manual, Carrying Case

 
           

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