VICTOR VC921 DMM Integrated Personal Handheld Pocket Mini Multimeter

[R_G_B_]

I have a Vichy 921 pocket multi meter just to carry around as a cheap multi meter for quick checks.


interestingly all functions seem to work accept the duty cycle function...this seems a bit odd.

It can measure duty cycle on a PWM of a function generator. Or duty cycle of 240V A.C mains.
However it will not measure the duty cycle on a fuel metering valve PWM signal on a car. It just shows 99%

It is able to measure the frequency of the metering valve but why not the duty cycle?

Its a 14.Volt PWM signal seems a bit odd other multi meters I have measure the duty cycle no problems.

Has anyone else discovered such a problem?

http://www.aliexpress.com/item-img/VICTOR-VC921-DMM-Integrated-Personal-Handheld-Pocket-Mini-Multimeter-AC-DC-LCD-Digital-Multimeter-LCR-Meter/32227933928.html?spm=2114.10010108.1000017.2.7rEXYW

R_G_B

[Maxlor]

Many multimeters have trouble measuring PWM signals that have a DC offset. Try measuring with a small capacitor inline.