Hello all!
I’m new to using an oscilloscope and am merely a car audio enthusiast who is looking for a clean signal coming from my amplifiers. My question is with the 140i, what is the maximum AC voltage it will accept. On average I will see anywhere from 30-40v AC from my amplifier outputs. Will the 140i be able to handle this on the 10x probe?
If it will not be able to handle that voltage, is there another probe that can be purchased that would allow me to do this?
I have already purchased the meter and am waiting for it to arrive in the mail so I’m keeping my fingers crossed that it will be able to measure along those lines of VAC.
30VAC = 43Vp, so there is no problem to use the ‘x1’ setting, as the unit can handle 100Vp.
However, it is always better to start at ‘x10’ for unknown voltages.
100Vp x 10 = 1000Vp theoretically. Most ‘x10’ probes are limited to 600Vp.
So I wanted to say thanks again for those who answered my original question; now I have yet another lol.
As previously stated I simply use my scope for general car audio builds and testing primarily AC voltage from head unit RCA outputs to check for maximum, unclipped volume. Once found I turn the radio volume to that point and set gains on the amplifier using a sine wave again. Lately though I’ve been noticing that my scope is not reading immediately as it used to and I get a double wave that is very jittery on the screen. I’ve calibrated on the rear pad of the unit and still no change. It’s actually to the point that I can measure with my fluke DMM AC voltages of ~30v but the scope shows around .5v and doesn’t give me good readings.
Well, honestly I’m not 100% sure on how to check that :-/ When I place the probe tip on the pad on the back side of the unit to calibrate it, it seems to work just fine. Any tips on how to check functionality of the probe otherwise?
Well here is another weird symptom that I just noticed while trying to measure RCA voltage again. While playing a 1k hz tone I get the double wave that is jittery but as soon as I pause the track it forms into a normal looking wave. If it is in fact just a probe issue then hopefully I can just get a new probe
[quote=“VEL417”]30VAC = 43Vp, so there is no problem to use the ‘x1’ setting, as the unit can handle 100Vp.
However, it is always better to start at ‘x10’ for unknown voltages.
100Vp x 10 = 1000Vp theoretically. Most ‘x10’ probes are limited to 600Vp.[/quote]
If i understand it well, we can use the HPS140i to measure 230V AC of a LV installation ?
In combination with the x10-setting of course.
Just for safety reasons: what’s the most bad thing that can happen when someone forget to use the x10-setting and put 230V AC to the input of this handheld device ? Will it explode ? Or are there still internal protections foreseen?
