Hi Joonam,
Thanks for contacting National Instruments!
I looked into the way the agilent device was doing the C-V measurement and our DMMs measure the capacitance in a fundamentally different way. It would not provide the same result as a proper impedance analyzer, so this can not be done with NI-DMM modules. You really need a full scale impedance analyzer to get good C-V characteristics. Let me know if there is anything else I can help with.
Have a great day,
Michael D
Applications Engineering
National Instruments