I was measuring a 'steer' signal for switching on a relay. The oscilloscope, gave me back it peaks at around 2.64V. The width of the signal is 132ms.
I then hooked up my multimeter, to measure how much amp was drawn. However the reading varies (between 4 – 14 mA). Which made me wonder.
My question: is there a minimum amount of time a multimeter needs to 'register' a correct load? In other words, is 132ms long enough to get a decent reading?
If not, what would be a correct way of measuring?
If it matters, it might be depending on the 'quality' of the multimeter? I used a UNI-T (UT61).
Best Answer
A typical update rate for a multimeter is 3 to 10 times a second, so 132 milliseconds is likely not enough time.
Since you have an oscilloscope, you can put a low value resistor in series with the load and measure the voltage across the resistor with the oscilloscope.