Simultaneous voltage and current acquisition

Hello, I'm looking for a DMM that will allow me to measure voltage and current at the same time for pvdf samples (which generate charges when pressure is applied). Note that the voltage I get may be high, but the current is very low in the nanometer or microampere range. My aim is to characterize pvdf films and display the current and voltage curves generated by the films on labview.  Thanks for your help and suggestions.

So, you will generate V and I data as function of some changing amount of mechanical stress?

For voltage, how high is high?  I suspect the sample also has high source impedance.  Therefore your volt meter needs input R spec larger than the source R to avoid loading errors.  Suggest the electrometer 6514 or 6517B.
Alternatively, a SourceMeter with low current ranges can be put into force 0 amps and limit voltage to some value higher than what you expect to measure.  Something like 2636B or 2635B has 1nA source range and offers quite good input R when behaving like volt meter good up to 200V.  Use 2657A if you need higher voltages.

By definition, a good v-meter has zero current flowing into or out of the meter.  So makes it not feasible to also measure the current on those same connection points with same instrument.  Unless the instrument is a SourceMeter, then it can change its configuration and force 0 V with current limit higher than you need to measure.
But understand I am describing two sequential measurements:  measuring V when force 0 Amps, then measuring I when forcing 0 V.  Can this work for you?

If envisioning two meters, how will you connect them?  Seems the amp meter will compete with the V meter for what the charge stored on your sample should do.

 

Yes, that's exactly what I want to do: "Measure the current and voltage of my films as a function of mechanical stress". To do this, I need a measuring device that can do this, because when I use two devices, I can only force one of the instruments to Zero and measure with the other instrument. Since I want to characterize my films in voltage and current in a single experiment without using electrical components such as resistors, I don't want to lose any energy, since the next step would be to add an energy storage circuit.
Maximum voltage is 150 volts.
If there's no measuring instrument that allows me to measure current and voltage using the same connection points, do you think there's a way of using probes that will allow me to measure voltage at a distance, i.e. without connection to the film?