Extech EX330 current ranging issues
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- bebo
- Posts: 96
- Joined: Tue Mar 29, 2011 8:22 am
Extech EX330 current ranging issues
I'm getting some results from the multimeter that seem wrong. When I switch between microamps and milliamps, the decimal point only shifts one place. A reading of 15 microamps reads as 1.5 milliamps when I switch the setting. That and the value seems totally off for a simple series resistor circuit. 9VDC and two 1K resistors in series should be 4.5 milliamps, correct? On the microamp setting, I can toggle the "range" button and get two different values, 13.3 and 40. What gives?
- adafruit_support_mike
- Posts: 67485
- Joined: Thu Feb 11, 2010 2:51 pm
Re: Extech EX330 current ranging issues
Could you post a photo showing the connections you're using when you take the measurements please? 800x600 images usually work best.
- bebo
- Posts: 96
- Joined: Tue Mar 29, 2011 8:22 am
Re: Extech EX330 current ranging issues
I'll get an image shortly, but when I made the same measurement with a different, lower quality meter, it reads 4.5mA just like it should.
- bebo
- Posts: 96
- Joined: Tue Mar 29, 2011 8:22 am
Re: Extech EX330 current ranging issues
I have the meter attached between the 9V rail and the first 1K resistor. The Woods meter is in agreement with Ohm's law, the Extech not so much. If I switch to the 5V rail, the Woods reads 2.5 mA, and the Extech 1.7 mA.
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- adafruit_support_mike
- Posts: 67485
- Joined: Thu Feb 11, 2010 2:51 pm
Re: Extech EX330 current ranging issues
Thank you.. the circuit and connections look good.
Do you get weird values on any of the other settings?
Do you get weird values on any of the other settings?
Please be positive and constructive with your questions and comments.