Section 1
OM6636-B-00
12 February 2015
1-1
1. INTRODUCTION
1.1.
SCOPE
This manual contains technical specifications, a detailed description, maintenance information,
and diagrams for the Guildline Instruments model 6636 Resistance Standard.
1.2.
GENERAL DESCRIPTION
The model 6636 Resistance Standard is a rack mountable or bench top instrument which
provides a set of precision resistance standards enclosed in a multi-walled constant temperature
chamber. The internal temperature is maintained by a solid state control system at 30 C
0.01 C. The design assures minimum thermal gradients within the inner chamber containing
the standard resistors. The resistors are immune to normal shock and vibration in commercial
carrier shipment.
To protect the standard resistors from overheating due to a malfunction of the temperature
control, there is an overriding over-temperature control that will disable the heating system if the
temperature exceeds 34 °C 3 C.
The model 6636 is intended to be used as Primary Resistance Standards, or Working Resistance
Reference Standards. The 6634A is particularly useful for an Automated High Resistance
Measurement System.
1.2.1.
Resistance Ranges
Six resistor elements within the standard model 6636 configuration cover the range of
10 MΩ to 1 TΩ in decade steps. Each resistor element is isolated and has a 2 terminal
connection at the back panel.
1.2.2.
Non-Standard Model Configurations
The 6636 can be supplied with resistance value in the range of 100 k to100 T . Only
six resistance elements may be installed in a single unit.
