Section 1
OM6634A-B-02
4 January 2019
1-1
1. INTRODUCTION
1.1.
SCOPE
This manual contains technical specifications, a detailed description, maintenance information,
and diagrams for the Guildline Instruments model 6634A Resistance Standard.
1.2.
GENERAL DESCRIPTION
The model 6634A 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 6634A is intended to be used as a Working Standard Resistance Reference for an
automated resistance measurement system.
1.2.1.
Resistance Ranges
The ten resistor elements within the model 6634A-10 cover the range of 0.001 Ω to 100
MΩ in decade steps. Each resistor element is isolated and has a 4-terminal connection at
the back panel. The normal power to be applied to each resistor element is 10 mW.
Other models are as described in section 1.2.2.
1.2.2.
Standard Model Configurations
The following standard models are available with the resistance element ranges specified.
Other variations can be supplied as a requested special build with any values of resistance
from 0.001 Ω to 100 MΩ.
Model 6634A-10 comprises a full complement of 10 elements from 0.1 Ω to 100 MΩ
ohms in decade values.
Model 6634A-9 comprises 9 elements from 0.1 Ω to 10 MΩ in decade values.
Model 6634A-8 comprises 8 elements from 1 Ω to 10 MΩ in decade values.
Model 6634A-5 comprises 5 elements from 1 Ω to 10 kΩ ohms in decade values.
Summary of Contents for 6634A Resistance Standard
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