Model IMP-2
(click image for larger view)

• 4 RANGES - ACCURATE FROM 100 OHM TO 5 MEGOHMS

• STANDARD 1 kHz SIGN WAVE TESTING FREQUENCY

• SAFE TO USE IN PREP NANOAMP TEST CURRENT

• EASILY PORTABLE BATTERY OPERATED

Description:

The Model IMP-2 is an instrument for measuring metal electrode impedance at 1 kilohertz. The Model IMP-2 will measure impedance between 100 ohms to 5 megohms and display the value on an easy to read quality meter. A switch is provided which in one position will test the electrodes impedance (the Model IMP-2 has its own internal oscillator) or in the other position will allow an externally derived current or voltage source to be applied to the electrode for the purpose of breaking down an oxide layer, bubble testing or lowering the tip impedance.
The Model IMP-2 is not only useful for characterizing high impedance metal microelectrodes but is also an excellent instrument for matching the lower impedance values normally associated with electrodes used in differential EMO recordings. When differential recordings are done with electrode pairs having approximately the same impedance value, the common mode rejection factor will substantially increase, thus increasing the signal-to-noise ratio. The batteries are easily tested by a battery test switch in which the battery voltage is read on the meter. The IMP-2 also provides a calibrate push button switch for internal calibration of each range. The Model IMP-2 is a bench model unit with a carrying handle that can adjust the unit to any viewing angle.

Amplifiers - The Model IMP-2 test circuit is identical to that incorporated in the BAK A-1 and MDA-4I Metal Microelectrode Amplifiers.