Accession Number:

AD0726494

Title:

Voltmeter Using F.E.Ts Measures Capacitor Insulation Resistance,

Descriptive Note:

Corporate Author:

DEFENCE RESEARCH ESTABLISHMENT TORONTO DOWNSVIEW (ONTARIO)

Personal Author(s):

Report Date:

1971-01-01

Pagination or Media Count:

3.0

Abstract:

The ideal voltage follower is characterized by an infinite input impedance, zero output impedance and zero offset. The field-effect transistor is the natural choice for the input device because of its inherently high input impedance. This can be raised further by feedback. Output impedance is made low by negative feedback, which may be further enhanced by positive feedback within the negative feedback loop. Low offset voltage output minus input voltage is best ensured by using a balanced long-tailed pair to compare the input and output voltages. Finally, a number of advantages will be realized by operation at constant tail current. Author

Subject Categories:

  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE