BS 5164:1975

This standard BS 5164:1975 Specification for indirect-acting electrical indicating and recording instruments and their accessories is classified in these ICS categories:

• 17.220.20 Measurement of electrical and magnetic quantities

1.1 This British Standard specifies requirements for indirect-acting electrical instruments using a null balance method which need an auxiliary electrical power supply.

These instruments may indicate the value of the measured quantity or record the value of the measured quantity as a function of time. Instruments may combine both these functions.

1.2 This standard also applies to electrically operated measuring equipments, provided that the electrically operated measuring instrument (receiver) only is considered and that the relationship between the non-electrical and the electrical quantity is known.

1.3 This standard does not apply to:

1. devices comprising a direct-acting indicating and/or recording instrument energized by a measuring amplifier;
2. electrically operated measuring equipment when the relationship between the non-electrical and the electrical quantity is not known;
3. control apparatus even though it includes indicating or recording instruments;
4. indirect-acting electrical instruments in which the measured quantity is presented in the form of digits, codes, punched cards, etc.;
5. position follower instruments;
6. recording instruments in which the chart movement is a function of a quantity other than time;
7. integrating instruments or auxiliary integrating devices incorporated in instruments within the scope of this standard.

1.4 This standard does not contain requirements for protection against environmental conditions.

1.5 This standard does not specify requirements concerning dimensions of instruments or detailed requirements concerning terminal markings and diagrams of connection.

NOTE The titles of the British Standards referred to in this standard are listed on the inside back cover.

Defines and classifies instruments using a null balance method and needing an auxiliary electrical supply. Permissible intrinsic errors, reference conditions and variations for measured quantity and time-keeping for recording instruments. Also electrical, mechanical, constructional and marking requirements.