Measurement of membrane potential

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Morgado
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Measurement of membrane potential

I want to measure the membrane potential of A7r5 cells with  an Axopatch 200B and I need some help to do this.
How should I choose the composition of the internal solution (to put into the pipette) so that the value measured is close to the physiological membrane potential? The external solution I want to use is PBS (Phosphate Buffer Saline).
Concerning to the amplifier, should I use I-CLAMP mode, with I=0?
Any suggestions and papers are welcome.
Thanks in advance for any help.
Morgado