DESCRIPTION

For measurement at 100 pF and

below, a three terminal connection

increases the accuracy by eliminating

the uncertainty in the measurement

introduced by the capacitances

between the capacitor terminals

and ground.

The type 1403 Standard Air Capacitors

are stable, three-terminal

standards in decimal values from

0.001 to 1000 pF. Their terminals

are arranged to plug directly into the

UNKNOWN terminals of the Type

1620 Capacitance Bridge or equivalent

such as AH2500A Ultra Precision

Capacitance Bridge.

The three largest sizes are similar

in construction to the Type 1404.

The smaller capacitance units

are made up of two plates, with

a grounded plate between them;

an aperture in the grounded plate

determines the magnitude of the

direct capacitance.

Dielectric losses are extremely

low as there is no solid dielectric

in the direct-capacitance fi eld.

All have shielded terminals, both

of which are connected to the

case.