Question about Velleman DVM850BL Digital Multimeter

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I purchased the velleman DVM850BL to check current drain from my vehicles batteries as I keep having to recharge my batteries pretty often. Since I am not an electrician or electronic tech, I would just like to know what settings to use to measure the current drain with this unit. I am wanting to check for mili volt current.

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To check the current, you'll have to set up your equipment to the mA (milliamp) position. It's located on the right side of the equipment, on the "A" section. The test leads should be positioned accordingly and it is: black in the middle connector (common) and red on the right connector (mA).
It's safe to start measuring the current in a higher scale. Safe for the equipment. So start measuring with the equipment set to the 10A scale and the red test lead on the left connector (which reads 10ADC or so) and check the reading to see if it's below 0.2A, which is the same equivalent of 200mA. If it is, then it is safe to start reading the milliamp (mA). Undo the leads to the mA port and change the equipment scale to 200mA. If you don't observe this and you try read a current higher than 200mA, your equipment might burnout.
But wait: to measure current, you have to open up the circuit that you pretend to do the reading. You can only measure voltage (not current) with the circuit "closed" (also be careful to not try to measure voltage while the equipment is set to measure Amps. Leads will meltdown!!).
To do this, remove one of the batteries terminal. Doesn't matter if it is positive or negative. Then, with the equipment already set to the scale you want, connect one lead to the terminal and the other to the cable or wire that you just disconnected. This will provide continuance of the circuit, having the current going through the DVM and displaying the actual current through that circuit.

Posted on Nov 22, 2013


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