BS ISO 7278-3:1998

1 Scope
2 Normative reference
3 Definitions
4 Principles
    4.1 General
    4.2 Double-timing method
    4.3 Quadruple-timing method
    4.4 Phase-locked-loop method
5 Conditions of use
    5.1 General
    5.2 Double-timing method
    5.3 Quadruple-timing method
    5.4 Phase-locked-loop method
6 Method requirements
7 Tests for pulse interpolation system
    7.1 General
    7.2 Test circuit
    7.3 Test schedule
    7.4 Immunity from electrical noise
8 Test report and markings
Annex A (normative) Measurement techniques for determining
pulse intervals
Annex B (informative) Bibliography

Three methods commonly used in conjunction with pipe provers and turbine or displacement meters. Test procedures for checking satisfactory operation.

This part of ISO7278 gives guidance on the procedures and conditions of use to be observed if pulse interpolation is used in conjunction with a pipe or small volume prover and a turbine or displacement meter to improve the discrimination of proving.

This part of ISO7278 describes the three methods of pulse interpolation most commonly used and their conditions of use. It also describes the equipment and test procedures for checking that the pulse interpolation system is operating satisfactorily and it describes some methods of measuring the irregularity of pulse spacing for a meter.