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why Fluke use bandpass filter in their DMMs?
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joeqsmith:
internal switches, not lamps.

check here for example:
http://www.cyrustek.com.tw/en/wp-content/uploads/ES51997.pdf
David Hess:

--- Quote from: tszaboo on October 05, 2023, 03:40:47 pm ---Come on, take a look at the picture, there are at least 20 light bulbs in that multimeter according to the schematic.
Or someone used that symbol as the selector switch's switching part as a lightbulb. If you look at it, 29-30-31-32 clearly sets a gain of an amplifier.
--- End quote ---

Any light bulb is a switch, if driven hard enough, and the reverse.
TimFox:
Symbolism can be difficult.
tridac:
There are references in that article, one (9), being Analog Filter Design by Val Valkenburg. Looked that up and lloks like it may have material on the filter topology of interest. Found a copy on ABE Books for less than $10, soon to be on it's way to me...
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