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New EEVblog BM786 Multimeter

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fabrizio_fabrice:
Just discovered the 786 doesn't have an AC (only) voltage range!?  But it has the same symbols on the face as mV, mA, and µA — and they do cycle through all three.

I thought it was just an oversight in the manual, because I hadn't heard mention of this (I don't live here).  Now I read the manual in a different light— p. 7 heading is: DCV; DC+ACV.   No AC volts!   Measuring AC gain needs some math given the usual change in DC biases present.

What's the rationale?

Monkeh:

--- Quote from: fabrizio_fabrice on February 21, 2021, 08:47:04 pm ---Just discovered the 786 doesn't have an AC (only) voltage range!?  But it has the same symbols on the face as mV, mA, and µA — and they do cycle through all three.

I thought it was just an oversight in the manual, because I hadn't heard mention of this (I don't live here).  Now I read the manual in a different light— p. 7 heading is: DCV; DC+ACV.   No AC volts!   Measuring AC gain needs some math given the usual change in DC biases present.

What's the rationale?

--- End quote ---

The rationale is you rotate the switch one position counter-clockwise to the ACV position.

fabrizio_fabrice:

--- Quote from: Monkeh on February 21, 2021, 08:50:25 pm ---
--- Quote from: fabrizio_fabrice on February 21, 2021, 08:47:04 pm ---
What's the rationale?

--- End quote ---
The rationale is you rotate the switch one position counter-clockwise to the ACV position.

--- End quote ---
Ahhhh.... thanks, Monkeh!    I'm 'challenged' |O by manuals that cover multiple versions. 

It would make more sense to me if they integrated ACV with the DC and AC+DC? settings like the other parameters.  So much for HID protocol.

Monkeh:

--- Quote from: fabrizio_fabrice on February 21, 2021, 10:32:15 pm ---
--- Quote from: Monkeh on February 21, 2021, 08:50:25 pm ---
--- Quote from: fabrizio_fabrice on February 21, 2021, 08:47:04 pm ---
What's the rationale?

--- End quote ---
The rationale is you rotate the switch one position counter-clockwise to the ACV position.

--- End quote ---
Ahhhh.... thanks, Monkeh!    I'm 'challenged' |O by manuals that cover multiple versions. 

It would make more sense to me if they integrated ACV with the DC and AC+DC? settings like the other parameters.  So much for HID protocol.

--- End quote ---

Too many settings. ACV, ACV + LPF ('VFD mode'), DCV, DC+ACV, dBm. Better to have a couple more switch positions than have people cycle through so many modes by button. The mV range is less used so they just crammed them all in there, and it's a pain.

IanB:

--- Quote from: fabrizio_fabrice on February 21, 2021, 10:32:15 pm ---It would make more sense to me if they integrated ACV with the DC and AC+DC? settings like the other parameters.  So much for HID protocol.

--- End quote ---

Sometimes turning the dial can mechanically switch certain components in or out of the circuit. If they tried to do it using push buttons they would have to use a relay instead. The rotary dial is more reliable.

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