Fluke RPM4 manual SETTING/SELECTION Purpose SET to Section, Absolute mode Zero absolute

3. OPERATION

The AutoRange function simplifies the task of selecting the Q-RPT best suited to cover a specific test range and setting measurement parameters appropriately for the range. These are set automatically based on operator entry of desired measurement mode, pressure unit of measure and range full scale. The selections and settings made by AutoRange are summarized in Table 6.

A range set up using AutoRange and all its range specific settings, may be saved for recall using [SETUP], <1range> (see Section 3.4.1). Saved ranges are available for later selection using [RANGE] (see Section 3.3.1). If a range created by AutoRange is not saved, it is overwritten by the next AutoRange or erased when another range is selected.

Press [ENT] from the main run screen in RATE mode to use the [AutoTest] function to AutoRange RPM4 based on DUT tolerance (see Section 3.3.10).

Table 6. Settings Made by AutoRange

SETTING/SELECTION	PURPOSE	SET TO	SECTION
Unit	Set pressure unit of measure	Operator specified during	3.3.2
		AutoRange
Mode	Set pressure measurement mode	Operator specified during	3.3.3
	(absolute, gauge, negative gauge)	AutoRange
Full scale	Establish span maximum	Operator specified during	None
		AutoRange
AutoRange span	Basis of span based setting	Absolute mode: Zero absolute	None
	calculations	to AutoRange full scale
		Gauge mode: Zero gauge to
		AutoRange full scale
		Negative gauge mode: Minus
		atmosphere to AutoRange full
		scale (negative equivalent of full
		scale on BG15K Q-RPT).
Q-RPT	Select most appropriate Q-RPT	Absolute and negative gauge	1.2.2.1
	to cover range and mode.	mode: Axxx Q-PRT with lowest
		default full scale that is greater
		than the AutoRange full scale
		Gauge mode: Q-RPT with
		lowest span whose full scale is
		greater than AutoRange full
		scale, Gxxx over Axxx if spans
		are equal.
Upper limit	Set maximum and minimum	Upper limit: 105 % of operator	3.4.4
Lower limit	pressure alarm limits.	entered full scale pressure
		Lower limit: None in absolute
		and gauge modes. Minus
		atmosphere in negative gauge
		mode, minus equivalent of upper
		limit in negative gauge mode on
		a BG15K Q-RPT. Minus 66 kPa
		(9.6 psi) with BA100K.
Resolution	Set display resolution	10 ppm of AutoRange span or	3.4.2
		1 ppm of default Q-RPT span,
		whichever is larger.
Stability Limit	Set Ready/Not Ready stability	50 ppm of AutoRange span or 2	3.4.3,
	criterion.	ppm of default Q-RPT span,	3.3.4
		whichever is larger.
Q-RPT turn down	Turn down Q-RPT	See RPM4 pressure	1.2.2.1
(Premium class Q-RPTs only)	characterization to improve	measurement specifications
	measurement uncertainty when
	span is reduced

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