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Automated Pressure Calibrator
Measurement Setup
43
Measurement Modes
Note
The measurement modes depend on the pressure modules that are
installed.
The Measurement Modes on the Product are:
Absolute Mode – An absolute pressure measurement is made in relation to a
perfect vacuum. A value of 0 represents a perfect vacuum. Certain ranges of
PMMs are intrinsically absolute mode measurement modules, designated in their
model number by having an ‘A’ at the beginning of the range designation section
of the model number (for example, PM200-A200K). In addition, an inherently
gauge mode module (represented by a ‘G’ at the beginning of the range
designation section of the model number) can be used to measure absolute
pressure if combined with a Barometric Reference Module.
Gauge Mode – A gauge pressure measurement is made in relation to
atmospheric measurement. A value of 0 represents a pressure measurement
taken at atmospheric pressure. Certain ranges of PMMs are inherently gauge
mode measurement modules, designated in their model number by having a ‘G’
or ‘BG’ at the beginning of the range designation section (for example, PM200-
G400K). A ‘BG’ designation means that the PMM is a bi-directional gauge and
thus has the ability to measure both positive and negative gauge (also referred to
as vacuum) pressures. In addition, certain intrinsically absolute modules have a
built-in barometer, allowing the modules to measure absolute, gauge, and
negative gauge pressures.
Tare Mode – When the user initiates Tare mode, the Product zeros out the
current pressure reading. This allows an intrinsically absolute measurement
module to be used to measure gauge mode measurements when not equipped
with an internal barometer. Only use this method when atmospheric pressure is
sufficiently stable.
Note
The Product shows vacuum pressures as negative values (for
example, -465 mmHg). Some vacuum gauges do not show a
negative sign (-) in front of the reading because they are used for
only vacuum measurements (the vacuum gauge shows “465 mmHg
psi vacuum” without the negative sign). To prevent misinterpretation
of the vacuum gauge reading compared to the negative value on the
Product, look at the gauge face or user documentation to see how
the vacuum gauge shows vacuum pressures.
Measurement Resolution
Open the Measure Settings on the main menu to change the measurement
resolution for the pressure and the electrical measurement. For pressure, the
Measurement Resolution selections are 0.1%, 0.01%, 0.001%, or 0.0001% of the
active PMM range (shown as Range on the display). For electrical, the selections
are 0.1, 0.01, 0.001.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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