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Brymen 869s DC offset issue when reading ACmV

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David Hess:

--- Quote from: Neutrion on January 25, 2022, 01:17:25 pm ---Maybe it's the colour. :)  However these days maybe even shining gold would be possible! On the other hand I have to admit that I like the yellow colour of the Fluke too, pity that Brymen chose the red. But it has some positive meaning in buddhist tradition if I remember right.
--- End quote ---

Fluke's yellow is protected IP.  That was something they sued Tektronix over causing Tektronix to change the color of their meter holsters to deep blue.

AVGresponding:

--- Quote from: David Hess on January 25, 2022, 05:44:10 pm ---
--- Quote from: Neutrion on January 25, 2022, 01:17:25 pm ---Maybe it's the colour. :)  However these days maybe even shining gold would be possible! On the other hand I have to admit that I like the yellow colour of the Fluke too, pity that Brymen chose the red. But it has some positive meaning in buddhist tradition if I remember right.
--- End quote ---

Fluke's yellow is protected IP.  That was something they sued Tektronix over causing Tektronix to change the color of their meter holsters to deep blue.

--- End quote ---

All the more ironic that they both ended up getting bought by Danaher. And then split off into Fortive.

NickKUK:
Hi,
I have query about this as I'm on the lookout for a 5digit DMM that can handle up to 1kV (tube amps, solid state and other general electronics). I'm thinking that the BM869 would suit this requirement but reading the mVac threads, I'm in doubt.

The scenario I specifically want is the ability to measure the top of a triode cascode (320Vdc+small Vac) or power output stage (400Vdc+ with a small mVac to large 100Vac waveform).

Short question - can the BM869 do that or not?

Now I could use a HV film cap and measure the AC, but would auto ranging Vdc up to 800Vdc with a 100-200Vac component work to measure the Vdc side with the BM869?

(I have a scope but I'm looking for DMM)

2N3055:

--- Quote from: NickKUK on November 10, 2022, 12:30:13 pm ---Hi,
I have query about this as I'm on the lookout for a 5digit DMM that can handle up to 1kV (tube amps, solid state and other general electronics). I'm thinking that the BM869 would suit this requirement but reading the mVac threads, I'm in doubt.

The scenario I specifically want is the ability to measure the top of a triode cascode (320Vdc+small Vac) or power output stage (400Vdc+ with a small mVac to large 100Vac waveform).

Short question - can the BM869 do that or not?

Now I could use a HV film cap and measure the AC, but would auto ranging Vdc up to 800Vdc with a 100-200Vac component work to measure the Vdc side with the BM869?

(I have a scope but I'm looking for DMM)

--- End quote ---

Short version?

Only mV range is always DC coupled.

So measuring 4 mVAC  riding on 5V (or more) is a no go in mV mode. In mV mode any combination that produces more than +-500 mV P-P. is a no go.
Id you want to measure mV level AC ripple on top of 200V, you need to use capacitor, and will have to measure DC separately.

But if you are in V mode (AC, DC, AC+DC) all works fine. And you can easily measure 10VAC riding on 800V.

NickKUK:

--- Quote from: 2N3055 on November 10, 2022, 03:16:54 pm ---Short version?
Only mV range is always DC coupled.

So measuring 4 mVAC  riding on 5V (or more) is a no go in mV mode. In mV mode any combination that produces more than +-500 mV P-P. is a no go.
Id you want to measure mV level AC ripple on top of 200V, you need to use capacitor, and will have to measure DC separately.

But if you are in V mode (AC, DC, AC+DC) all works fine. And you can easily measure 10VAC riding on 800V.

--- End quote ---

Perfect (as perfect as any DMM can be!).

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