Pman
0
- Joined
- Nov 28, 2012
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- 4,447
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- 113
Never used a test load before when setting a driver (did it my own way but that's not important right now). Bought a 3A test load from SL (Jufran was out) and went to use it today and I can't understand what is wrong.
My understanding is it is pretty simple.
-Power to board (using a variable DC power supply)
-diode connections from board to driver connections on test load
-Set jumper
-DMM on DC mV across the 1 ohm resistor for mV to mA conversion (Not that it matters much butt using my Fluke 87V and yes I know how to use a DMM very well as Iv'e used them for over 30 years).
I'm not seeing anything across the resistor at all but see my readings change on the driver input to test load and this will vary by jumper setting and pot position.
The drawings I see looking back under search bar show that I should be reading from across the resistor. You can see the wires I attached to the pins across the resistor just so I wouldn't have to attach my leads on the board and have the board get pulled.
So, Mr. stupid would like to know what's up? No of course the board or anything else is sitting on a metal surface. That was just for a pic with different contrast. Yes I Know to discharge any caps on board also
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