Is current to voltage converter based on virtual ground circuit

From: zhong
email: zhong001@gmail.com
Model: 7220 lock in
Date: 02 Nov 2006

Comments

I am using the Model 7220 DSP lock-in amplifier to measure the current generated from piezoelectric thin film capacitor. The experimental condition requires the electric field between top electrode and bottom electrode is zero. In the manual, I do not find the detail of the current-voltage converter. The question will be if this converter is built by virtual ground circuit, which gives me almost zero electric field.