I
Ignoramus20878
- Jan 1, 1970
- 0
I would very much like to make some sort of a "peak voltage
detector". A device that, when plugged into a circuit, after a
while, builds up an adequate representation of peak voltage. That
would be again for my IGBT inverter.
That's for peak voltages under, say, 1 kV.
I tried making one from just a cap and diode, but multimeters would
discharge it too quickly and getting reliable readings is difficult.
After reading the art of electronics, something like this comes to
mind:
Make a small capacitor charged by diode (and a series resistor to
limit current). After a while, voltage would build up there.
Connect a voltage divider (say, 1 megohm and 1 kOhm in series). To the
cap. That would be a 1:1001 divider.
Connect that as input to some sort of FET based amplifier (that takes
voltage and does not require input current) that produces same
voltage, but at higher current. That would be the input ot a regular
multimeter.
The multimeter reading would need to be multiplied by 1000 to get the
actual voltage.
Alternatively to all this, does anyone know if higher end multimeters
like Fluke 8050A (which I have) can measure voltage without
discharging the cap so much? I have one lying around somewhere.
i
detector". A device that, when plugged into a circuit, after a
while, builds up an adequate representation of peak voltage. That
would be again for my IGBT inverter.
That's for peak voltages under, say, 1 kV.
I tried making one from just a cap and diode, but multimeters would
discharge it too quickly and getting reliable readings is difficult.
After reading the art of electronics, something like this comes to
mind:
Make a small capacitor charged by diode (and a series resistor to
limit current). After a while, voltage would build up there.
Connect a voltage divider (say, 1 megohm and 1 kOhm in series). To the
cap. That would be a 1:1001 divider.
Connect that as input to some sort of FET based amplifier (that takes
voltage and does not require input current) that produces same
voltage, but at higher current. That would be the input ot a regular
multimeter.
The multimeter reading would need to be multiplied by 1000 to get the
actual voltage.
Alternatively to all this, does anyone know if higher end multimeters
like Fluke 8050A (which I have) can measure voltage without
discharging the cap so much? I have one lying around somewhere.
i