Hi
I'm trying to measure the performance of a charge pump 3V -> 5V (and other circuits) in a battery powered microprocessor device.
Every multimeter I have tried imposes too much voltage burden when in series with the battery.
I'm trying to measure from around 0.1uA to about 5-10 mA (depending on the state of microprocessor - sleep states, etc)
Google tells me that I need a feedback opamp design meter.
I've spotted a Keithley 480 Picoammeter on Ebay, but it only goes up to 2mA
Does anyone have a suggestion about a suitable meter that I won't need a mortgage for?
Maybe I could build a suitable measuring circuit??
Can anyone point me to one?
How would I calibrate it?
Thanks
Bruce
I'm trying to measure the performance of a charge pump 3V -> 5V (and other circuits) in a battery powered microprocessor device.
Every multimeter I have tried imposes too much voltage burden when in series with the battery.
I'm trying to measure from around 0.1uA to about 5-10 mA (depending on the state of microprocessor - sleep states, etc)
Google tells me that I need a feedback opamp design meter.
I've spotted a Keithley 480 Picoammeter on Ebay, but it only goes up to 2mA
Does anyone have a suggestion about a suitable meter that I won't need a mortgage for?
Maybe I could build a suitable measuring circuit??
Can anyone point me to one?
How would I calibrate it?
Thanks
Bruce