GenRad 1621 capacitance bridge

The IET Labs, GenRad 1621 Capacitance Bridge is a completely self-contained system capable of capacitance measurements in increments as small as 0.1aF (10-4pF) and conductance measurements in increments as small as 100 aU (10-7µU; equivalent to a shunt resistance of 1010MΩ).

Measurements are three terminal, with 2- or 3-terminal connection, and provision is also made for the connection of an external standard for comparison measurements. 

Such capability and precision are usually accompanied by restricted frequency and complex operation. The 1621, however, avoids these difficulties. Little degradation of performance occurs from 10Hz to 10kHz and operation to 100kHz is possible. Balances are achieved by in-line readout lever switches — easily adjusted and read correctly. All digits of capacitance and conductance, as well as pertinent multipliers, are also provided by BCD-coded contact closures, available-at rear-panel connectors for use by printers or data-processing equipment.

Features

• Range 10-7pF to 10µF, 12-digit readout
• 10-ppm Basic accuracy
• Frequency range 10Hz - 100kHz
• Combines GenRad 1616 capacitance bridge, 1238-A null detector and 1316 oscillator
• 3-Terminai measurementswith 2- or 3-terminal connection
• Comparison measurements
• Simple lever balance with in-line readout