Author Topic: VICTOR VC921 DMM Integrated Personal Handheld Pocket Mini Multimeter  (Read 1035 times)

0 Members and 1 Guest are viewing this topic.

Online R_G_B_

  • Frequent Contributor
  • **
  • Posts: 373
  • Country: gb
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?


Offline Maxlor

  • Frequent Contributor
  • **
  • Posts: 564
  • Country: ch
Many multimeters have trouble measuring PWM signals that have a DC offset. Try measuring with a small capacitor inline.

Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo