Seaward RH9A Series - Manual (Page 6)

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RH9A Series High Resistance Decade Boxes Operating Instructions
Introduction
The Cropico RH9A series is a range of high resistance
precision decade boxes. Featuring 1, 3, 6, and 9 dials, they
offer resistances up to 1 Terraohm. Each instrument is built
using specially aged precision thick fi lm or metal fi lm
resistors that are mounted directly onto the purpose
designed decade switches.
The RH9A is useful as a laboratory tool or reference
standard wherever low current and high resistances are
encountered. A typical application would be in the
calibration of insulation testers.