HP4194a

(Instrument Driver for PRAP and ZAP)

Built into the optional data acquisition module of PRAP and ZAP is a driver for the HP4194a impedance analyser. The driver communicates directly with the instrument through an IEEE GPIB interface to collect resonance spectra into a new window of the software. Instrument settings are made through a single intuitive dialogue box.

The HP4194a is capable of scanning between 100 Hz and 40 MHz, and can apply a signal between 10 mV and 1 V. It can generate a DC bias of between 40 V and -40 V. The Z-Probe attachment extends the frequency range to between 10 Hz and 100 MHz and extends the AC signal range to between 0.126 mV and 1.26 V.

A DC bias greater in magnitude than 40 V can be applied to a specimen by amplifying the bias generated by the instrument, but additional isolation circuitry is required. Though the HP4194a is limited to frequency scans containing at most 400 points, the PRAP and ZAP software interface permit scans containing virtually any number of points.

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