Electronic Registers and Ancillary Equipment Incorporated in Metering Assemblies Specifications (SI/90-156)

29 A register and all ancillary equipment shall remain within the applicable limits of error when tested under the following conditions:

• (a) an ambient temperature in the range of -30°C to +40°C, except that a register and all ancillary equipment that are designed for use in a temperature-controlled environment shall be tested over the range of ambient temperatures that is specified by the manufacturer and marked on the name-plate of the register; and

• (b) a relative humidity in the range of 10 to 95 per cent.