Description:

The model MDA-41 has precisely the same operational characteristics and specifications as the model MDA-4 when the IMPEDANCE mode switch is in the NORMAL OPERATION position. When the IMPEDANCE mode switch is in either test position both inputs to the amplifier of the probe stage are grounded. The probe input connectors are reconfigured to connect to the impedance test circuitry of the probe. In the IMP. TEST + or the IMP. TEST - position of the IMPEDANCE mode switch, an AC constant current source is applied to the appropriate input lead and the impedance of its electrode is read on the meter. The other input lead is left floating.

Imdance Test Specifications:
 
Sine Wave Test Frequency: 1kHz
Testing Current: Less than 30 nanoamps
Impedance Testing Range: 10K to 5 Megohms
Accuracy: Less than 10% error

AC Differential Amplifiers , AC Differential Amplifiers with Remote Probe,  AC Differential Amplifier with remote Probe and Impediance Test, D.C. Differential Amplifier with remote Probe,  Micropipette Electrode Intracellular Probe System,  Custom Designed Miniature Multichannel Recording System,  Specification And Design Work Sheet: Model MMRS-1