#12 in Electrical testing products
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Reddit mentions of General Technologies Corp GTC CM100 1 mA to 100 Amps AC/DC Low Current Clamp Meter
Sentiment score: 2
Reddit mentions: 3
We found 3 Reddit mentions of General Technologies Corp GTC CM100 1 mA to 100 Amps AC/DC Low Current Clamp Meter. Here are the top ones.
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- AC/DC current measurement from 0.001 up to 100 A. which makes it a great tool for measuring parasitic draws and AC/DC voltage measurement up to 600 volt
- Small jaw: 1.2 inches (W) x 0.53 inches (D) (300x13.4millimeters) with clamp opening up to 1/2 inch (12.5 millimeters)
- Peak and Data hold functions with one rotary switch operation
- 2 readings per second sampling and continuity check with audible indicator
- Test leads soft carrying deluxe pouch and batteries included
Features:
Specs:
| Color | Grey with Yellow Clamp |
| Height | 2.5 Inches |
| Length | 11.4 Inches |
| Number of items | 1 |
| Weight | 0.9 Pounds |
| Width | 5.7 Inches |
A 117 is a pretty standard meter that will handle your basic measurements. Any of them will be safe for computer and automotive use if used properly. Dc clamp meters are handy for automotive. This one is pretty handy for catching smaller dc currents although the trade off is the jaws are small for larger cables such as those to the starter.
Dealer tech here,
First off, do you have any aftermarket remote start or alarm equipment installed in the vehicle?
All your volt testing looks like about what i'd expect.
I find the amp clamp somewhat suspicious. Subaru calls this "Dark Current" (also known as parasitic draw, dark draw, etc.) and ideally you should use a small-jaw clamp (i use this) that is considered "accurate" at sub-100 mA. Typically the large-jaw clamps are fine for 1A+ measurements but the resolution isn't great for lower amperages. In either case, you need to be damn sure the jaws are fully closed. I find the negative cable end easier to get the jaws around typically. You also need to zero the tool as close to the position the measurement would be in as possible - things like florescent lights can affect the readings. (My shop is full of florescent lights and turning my meter 90 degrees can throw it off by 60mA or more!)
That all being said, subaru's spec for dark current is 70mA or less. (They even published a bulletin about it, #07-85-14, which might be good for a read) so if you're confident that your measurement is accurate, then the likely culprit is the battery.
Also, all this testing and potentially a battery replacement is covered under your 3yr-36k mile warranty if you still have it.
I did find this
https://www.amazon.com/dp/B001TCWL1E/ref=cm_sw_r_sms_c_api_KDy7ybCTN2SPC
Will probably buy them for the teams as it's just a general troubleshooting tool. Big $$$ savings when we are buying 20 of them!