Fluke PG9000 Series, Руководство по эксплуатации и обслуживанию

Страница: 198 / 202

PG9602™ OPERATION AND MAINTENANCE MANUAL
© 2011 Fluke Calibration Page
188
7.3 Glossary
Absolute
As in absolute pressure. Pressure expressed relative to vacuum.
Absolute by vacuum,
avac
Absolute pressure determined by defining pressure relative to vacuum in an evacuated bell jar.
Absolute by
atmosphere, aatm
Absolute pressure determined by adding atmospheric pressure to gauge pressure.
Adder
A value added to internal sensor readings to offset the reading (pressure adder, temperature
adder, humidity adder, vacuum adder) for calibration adjustment.
Ae
Piston-cylinder effective area.
AMH
Automated Mass Handling system. Sometimes written as “AMH-100” to denote an AMH
capable of operating with up to a 100 kg mass set.
ATM Head
Pressure head correction to the barometer measurement to take into consideration the
difference between the actual barometer height and the PG9000 reference level.
Crossfloat
Process of comparison of two piston cylinders in which they are connected together under
pressure and the mass of one is adjusted so that both pistons float together at a common
pressure.
Default
The initial value of a quantity in the PG9000 that may be changed by the user. A value entered
or created for a standard configuration or on power up.
Differential
As in differential pressure – all pressure is by definition a differential between two values.
Specifically to PG9000 operating modes, it is pressure expressed relative to atmospheric or
another static pressure determined by subtracting the static pressure from absolute by vacuum
(differential measurement mode).
DUT (Device Under
Test)
The device being tested or calibrated. Synonymous with UUT or TI.
DUT Head
Fluid head correction to the pressure defined by PG9000 to predict the pressure at the level of
the DUT, which may be different from the PG9000 reference level.
FS (Full Scale)
The full scale value is the maximum value of a measurement range. Limits and specifications
are often expressed as % FS.
g, gl
Acceleration due to gravity (g). Acceleration due to gravity at location of use (gl). The
accelerational pull of gravity varies from one location to another.
Gauge
As in gauge pressure. Pressure expressed relative to atmospheric pressure.
He
Helium gas.
Head
Fluid head, a pressure difference due to a difference in height. See also ATM head, DUT head
and PISTON head.
HSTOP, LSTOP
High stop and Low stop, piston maximum end of stroke positions.
InHg
Pressure unit of measure, inches of mercury.
InWa
Pressure unit of measure, inches of water.
kcm
2
Pressure unit of measure, kilogram per centimeter square.
Measurement Mode
Mode in which PG9000 is defining pressures. These include gauge (pressure relative to
atmospheric pressure), absolute by atmosphere (pressure relative to vacuum but determined by
adding atmospheric pressure to gauge pressure), absolute by vacuum (pressure relative to
vacuum determined by establishing a vacuum around the mass load), differential (pressure
relative to atmospheric or another static pressure determined by subtracting the static pressure
from absolute by vacuum).
MS (Mass Set)
A group of masses composed for use with a PG9000 piston gauge. There are two types:
Manual and AMH.
Mass Bell
The sleeve loaded onto the piston to carry other masses.
Mass Entry Mode
(mass-to-pressure)
Operating mode in which the user enters the mass loaded on the piston and the PG9000
calculates the defined pressure. See also Pressure Entry Mode.
Medium, pressurized
The pressurized fluid.
Multiplier
A value by which internal sensor readings are multiplied to change their slope (pressure multiplier,
temperature multiplier, humidity multiplier, vacuum multiplier) for calibration adjustment.