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Extech 380942 30 Ampere True RMS AC/DC Mini Clamp on Meter

by Extech
4.2 out of 5 stars 22 customer reviews

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30A
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  • High resolution down to 0.1mA AC and 1mA DC
  • One touch Auto Zero for DC current measurements
  • Min/Max function
  • AC and DC voltage measurements to 400V using test leads
  • 0.9 inch (23mm) jaw opening
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  • Extech 380942 30 Ampere True RMS AC/DC Mini Clamp on Meter
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Technical Details

Style: 30A
  • Portable

Product Description

Style: 30A

True RMS Mini AC/DC Clamp Meter

The compact Extech 380942 is a 30A mini AC/DC clamp meter with a remarkable 0.1mA resolution (AC), very low-current sensitivity, and small diameter jaw designed to reach into small areas. The 30A range with 0.1mA (AC) and 1mA (DC) resolution is optimized for finding problems where very low current variances would be missed by standard clamp meters. This mini clamp meter is useful for troubleshooting tasks in plant maintenance, electrical, HVAC, and telecom work, as well as residential electrical, fleet maintenance, marine, and motorcycle repairs.

True RMS Compensates for Distortion from Electronic Devices

It can be very difficult to make accurate current and voltage readings in industrial and commercial applications when electronic devices are present. Fluorescent lights, motor drives, computer power supplies, and other electronic systems can distort the AC waveform, making it hard for averaging meters to get an accurate read. True RMS uses a more advanced formula to adjust for this kind of distortion.The Data Hold function freezes the display while the Min/Max function tracks and displays minimum and maximum values – useful for blind measurements and start-up draw. The Zero function makes it easy to perform relative measurements. The 4-digit (4,000-count) readout is easy to read and a 40 segment bargraph helps simulate an analog display, better illustrating swings in readings. Whether you are checking amp draws on commercial electrical circuit or troubleshooting a truck’s alternator, the small 0.9" (23mm) jaw opening is compact enough to fit in tight locations like engine bays.

Other Features

Measuring 7.2 x 2.5 x 1.4" (H x W x D), this CAT III-rated True RMS mini clamp meter comes with test leads, two AAA batteries, soft carrying case, and user manual. NIST certification is also available for this product.


Features Overview
  • 30A AC/DC current measurements
  • Very low current sensitivity range
  • 0.1mA AC and 1mA DC resolution
  • True RMS AC measurement capability
  • Data Hold, Min/Max & Auto Zero modes
  • Compact 0.9" (23mm) jaw opening size

Product Information

Style:30A

Technical Details

Part Number 380942
Item Weight 6.4 ounces
Product Dimensions 7 x 1.8 x 1.3 inches
Item model number 380942
Batteries 2 AA batteries required. (included)
Size 1
Style 30A
Item Package Quantity 1
Display Style LCD
Special Features Portable
Batteries Included? Yes
Batteries Required? Yes
Warranty Description 1 year

Additional Information

ASIN B00023RU0S
Customer Reviews
4.2 out of 5 stars 22 customer reviews

4.2 out of 5 stars
Best Sellers Rank #327,482 in Home Improvements (See top 100)
#694 in Home Improvement > Electrical > Testers > Voltage Testers
#17,263 in Home Improvement > Contractor Supply
Shipping Weight 1.1 pounds (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First Available April 20, 2004

Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

Customer Reviews

Top Customer Reviews

Style Name: 80A Verified Purchase
Clamp meters are very handy devices and I thought to give this low current meter a try. I restore antique cars and motorcycles for a hobby. Having a meter capable of measuring low current DC is very desirable. The specifications for this item say it will measure 1mA... IMPOSSIBLE!

The first unit I purchased would not zero. These are Hall Effect devices and it's very important to zero the meter in proximity to where you're taking a measurement to get an accurate reading. Good luck trying to do this. I took the meter out to test it. I used my Sorensen DC power supply (an extremely stable device) and hooked up to a calibrated load - that means I should have been able to read current levels precisely and accurately. When I hit the zero button on the meter it would set to zero and immediately start drifting... all over the place. There is no way to achieve an accurate measurement if the zero is drifting - the drift was large: 20-30mA. You can't measure 1mA accuracy if the unit is drifting 20 times that much.

I called Extech to confirm I wasn't using the meter incorrectly - they confirmed it shouldn't be behaving this way. So back it went. Amazon was terrific and sent a replacement immediately. The second meter behaved similarly, but it drifted even more wildly.

To claim 1mA you have to have a very stable meter. You should be able to measure the correct current (accuracy) and get the same number (or close to it) every time (precision). Each of the two meters I received could not deliver either an accurate or a precise measurement. Admittedly I didn't have time to conduct a very scientific test, but I don't believe this meter is accurate to anything better than 50mA.

It's possible Extech had a bad run on these meters and I received two lemons.
Read more ›
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Style Name: 200A Verified Purchase
Quickly this is an easy to use and I believe accurate tong meter. It's small size allow it to fit easily in a tool pouch. It does everything I want. I have cracked the display in my pouch. I'm now a little more careful how I put it in my pouch. I wish it came with a hard case. I'd probably still keep it in my pouch. My only issue is that it doesn't have an auto off and I'm forever putting it away with the power on, wearing out the battery. I also bought the 110 volt plug adapter that allows me to read one leg of the power cord of an appliance without spearating conductors. That's been real handy.
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Style Name: 80A
Extech 380950 Clamp Meter Does not zero or read low currents accurately. The meter would set to zero and starts drifting 20-50mA.
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Style Name: 200A
Low DC current range makes this meter ideal for trouble-shooting auto electrical problems. I used it to pinpoint a relay problem on my air-conditioning circuit without disconnecting the wires or connectors.
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Style Name: 400A Verified Purchase
I made a very big mistake choosing to buy this EXTECH mini clamp meter Model: 380947. If I had known I would have stick to FLUKE products.
I have fluke 287 - a very good multimeter; I have no issue with it. FLUKE is a reputable company well known for measuring instruments.

From the attached image, at 40A and 400A dc range, the meter (EXTECH mini clamp meter Model:380947) will not zero; it reads -00.19A and -002.1A at no current!!!!!!!!!!!
The accuracy is very very poor!!!!!!! in fact this is not a meter, it's just a junk. You can imagine taking dc current measurement at both 40A and 400A and getting two different readings.

For instance, at 40A range the reading was 01.34A and at 400A range, it read - 000.3A!!!!!!!!!!!!!! While the true reading suppose to be 1.560A when measured with other meters. I just wasted my hard-earned money of $299.99 plus shipping. Please I want a refund.

I am greatly disappointed. I will not recommend this product to anybody. If you need a good meter, buy FLUKE product.
My rating for this product was actually 0 star.
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Style Name: 200A
This is a superb multimeter. Mine has worked well for more than 10 years!
... Update: My Extech 380941 stopped working just after I submitted the above review. I should have added "knock on wood". When I asked Extech Service to quote a repair, I received a reply from FLIR, which appears to be the parent company of Extech. FLIR quoted $150 for repair plus $100 for calibration plus $75 for shipping, which does exceed the cost of a brand new meter by $55! (Amazon lists the Extech 380941 for $269.99.) In other words, this meter is not repairable.
BR
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Style Name: 80A Verified Purchase
Only 4 out of 5 stars because the readout is mediocre. The currently active measuring function, such as AC, DC, Ohms, V, mV, etc. is displayed in such tiny letters that it cannot be read reliably without a magnifier. Also, the decimal point is so small that it is hard to locate between the very large digits.

By the way, this Extech 380950 is nearly identical to the ESI 687. There are just minor differences in labeling style and the shape of the selector knob.
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Style Name: 30A Verified Purchase
Just great for measuring low current, especially DC. Hard to find a low current DC clamp-on. If you zero it just before you use it and right next to the wire, you can even check 4-20ma sources. Uses 2 AA batteries. Also checks voltages and includes banana plug test probes. Comes in a black canvas type case with Velcro closure and carry strap. 3 guys that I work with borrowed it and then bought one.
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Extech 380942 30 Ampere True RMS AC/DC Mini Clamp on Meter
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