S
shan
- Jan 1, 1970
- 0
Hi, everyone! I'm new to here.
I have some questions about measuring AC voltages.
I know that low-cost DMMs cannot measure accurately the AC (rms)
voltage for too high frequency normally below several hundred Hz even
for sinusoidal signal. But why? Is it due to the electronics inside or
is it a loading effect?
What above analog multimeters? Are they better/worse?
Besides the internal resistance ~ 10Mohm, what are the typical parallel
capacitance / series inductance values across a DMM inputs? Is it
normally neccessary to take these into account?
Thanks!
I have some questions about measuring AC voltages.
I know that low-cost DMMs cannot measure accurately the AC (rms)
voltage for too high frequency normally below several hundred Hz even
for sinusoidal signal. But why? Is it due to the electronics inside or
is it a loading effect?
What above analog multimeters? Are they better/worse?
Besides the internal resistance ~ 10Mohm, what are the typical parallel
capacitance / series inductance values across a DMM inputs? Is it
normally neccessary to take these into account?
Thanks!