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| why Fluke use bandpass filter in their DMMs? |
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| MegaVolt:
--- Quote from: David Hess on October 04, 2023, 09:11:55 pm ---There is a similar configuration for a DC accurate precision rectifier which is AC coupled on its input and output. --- End quote --- Do you have an example circuit diagram? |
| tridac:
Been trying to find more info on this filter design. Asked in another thread and pointed towards a Burr Brown third gen op amp techniques book, since found on ABE books. Still interested in a more thorough treatment, so which book or source did you find the above 5th order example ?. Thanks, still collecting data... |
| MegaVolt:
--- Quote from: tridac on October 05, 2023, 12:15:09 pm ---Still interested in a more thorough treatment, so which book or source did you find the above 5th order example ? --- End quote --- |
| David Hess:
--- Quote from: MegaVolt on October 05, 2023, 10:19:40 am --- --- Quote from: David Hess on October 04, 2023, 09:11:55 pm ---There is a similar configuration for a DC accurate precision rectifier which is AC coupled on its input and output. --- End quote --- Do you have an example circuit diagram? --- End quote --- The Tektronix DM501 and DM502 use it with a 318 type of operational amplifier which otherwise would contribute large DC errors. |
| tszaboo:
--- Quote from: Kleinstein on October 05, 2023, 07:48:25 am ---In a few cases light bulbs are used as a low current fuse. In the plan from the start the circle with x symbol is not for light bulbs but for CMOS switches. So no light bulbs but chip internal CMOS switches for the signal. P.s. : A light bulb is not a good fuse and may fail with an arc flash. It is not uncommon for a failing mains bulb to take out the breaker from that. --- End quote --- --- Quote from: David Hess on October 05, 2023, 07:08:56 am --- --- Quote from: tszaboo on October 04, 2023, 10:36:32 pm ---Why do they have so many lightbulbs in a multimeter? --- End quote --- As shown below, what light bulbs in multimeters might look like. --- End quote --- 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. |
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