GE RPT 301 user manual Filter Set-up, Command F, step, average, Set Resolution

20 RPT 301 User Manual

F - Filter Set-up

This command sets the instrument reading filter coefficients.

Command: F, step, average

Where: step is a pressure band within which the filter operates.

If the pressure steps outside this band, the filter is bypassed. This gives an unfiltered response to non-noise step changes.

step takes a value expressed as a percentage (0 - 100%) of full-scale.

If step = 0 then the filter is disabled.

average is the number of sequential readings (1 -

99)averaged by the filter. High values effectively give the filter a long time-constant.

Reply: None

B - Set Resolution

This command enables the decimal place of the reading to be adjusted within the instrument’s resolution, see specification. The reading resolution is automatically selected according to the instrument full- scale and the units that have been selected using the units set-up command. An algorithm is used that gives a resolution which does not interfere with the accuracy of measurement and is as noise-free as possible before filtering. The set resolution command allows the number of decimal places of the transmitted value to be specified, this overrides the automatic selection of resolution for the current selected units.

Changing units cancels any previous set resolution command.

The command is nonvolatile and remains selected until the units are changed. Changing and restoring the units can be used to cancel the set resolution command.

Command: B,n

Reply: None

Result: Sets the transmitted number of decimal places to be ‘n’ 0-5 max depends on units resolution.

K177 Issue No. 3