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EEVblog 121GW Multimeter Issues

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Fungus:

--- Quote from: jeraymond on April 01, 2022, 01:54:56 pm ---Hello — I'm seeing a problem where the 121gw shows incorrect frequency period. From my waveform generator I feed in a 0-5 V square wave at 1 kHz with a 50% duty cycle. The meter correctly shows a 1.0000 kHz for frequency, but a period of half the expected value at 0.4999 ms. Oddly adjusting the duty cycle changes the period measurement as well. With a 70% duty cycle at 1 kHz the period now reads 0.6999 ms. It seems to be missing the later half of the waveform in the period measurement.

--- End quote ---

Maybe the number on screen is "duty cycle".  :popcorn:

jeraymond:

--- Quote from: Fungus on April 01, 2022, 02:17:59 pm ---
--- Quote from: jeraymond on April 01, 2022, 01:54:56 pm ---Hello — I'm seeing a problem where the 121gw shows incorrect frequency period. From my waveform generator I feed in a 0-5 V square wave at 1 kHz with a 50% duty cycle. The meter correctly shows a 1.0000 kHz for frequency, but a period of half the expected value at 0.4999 ms. Oddly adjusting the duty cycle changes the period measurement as well. With a 70% duty cycle at 1 kHz the period now reads 0.6999 ms. It seems to be missing the later half of the waveform in the period measurement.

--- End quote ---

Maybe the number on screen is "duty cycle".  :popcorn:

--- End quote ---

Well, yes the bug seems to be that the period measurement mode is showing duty cycle instead. In the Hz dial position I press MODE once and get to 0.6999 ms (this should be period) a second press I get to the duty cycle measurement where it shows 70.0.

bicycleguy:
The latest manual (March 2020) on page 48 says:

The following modes are available on the frequency range :
1. Frequency
2. Pulse width
3. Duty Cycle

However, every where else in the manual they call 'Pulse width' 'Period'.  So it works as I like and the manual is wrong.  I think this was reported years ago.

markeng:
Hey Dave! Regarding: https://www.eevblog.com/forum/testgear/eevblog-121gw-multimeter-issues/msg2792850/#msg2792850

I sent you couple emails but haven't heard back. I have a broken input jack on my 121GW multimeter SN: 180807570, which is out of the affected range. Can you send me a replacement input jack, I would be happy to pay for it. I couldn't find a replacement jack anywhere online, if you don't want to send one out could you point me in the direction of where I can buy one?

Does anyone else on the forum know of a place to purchase a replacement input jack for my 121GW multimeter?

Thanks so much!

EEVblog:

--- Quote from: markeng on April 05, 2022, 05:38:35 pm ---Hey Dave! Regarding: https://www.eevblog.com/forum/testgear/eevblog-121gw-multimeter-issues/msg2792850/#msg2792850

I sent you couple emails but haven't heard back. I have a broken input jack on my 121GW multimeter SN: 180807570, which is out of the affected range. Can you send me a replacement input jack, I would be happy to pay for it. I couldn't find a replacement jack anywhere online, if you don't want to send one out could you point me in the direction of where I can buy one?

Does anyone else on the forum know of a place to purchase a replacement input jack for my 121GW multimeter?

Thanks so much!

--- End quote ---

I don't see any message from your email address.
I'll send you an email.

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