ADCS-601-AF™ OPERATION AND MAINTENANCE MANUAL
© 2005 - 2007 DH Instruments, a Fluke Company
Page 160
9.2
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
(PG7601).
ADCS Tools
ADCS-601-AF software that controls the overall system. ADCS Tools is run on a personal
computer that interfaces with the components of the ADCS-601-AF system.
Adder
A value added to sensor readings to offset the readings (pressure adder, temperature adder,
humidity adder, vacuum adder) for calibration adjustment.
Ae
Piston-cylinder effective area.
AMH
Automated mass handling system. ADCS-601-AF uses an AMH-38 on the PG7601 piston
gauge.
Control Cabinet
Main ADCS-601-AF system component. 19 in. rack mount enclosure in which the pressure
controllers, pressure monitor and Gas Supply Panel are installed.
DUT (Device Under
Test)
The device being tested or calibrated.
FS (Full Scale)
The full scale value is the maximum value or the span 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).
Gauge
As in gauge pressure. Pressure expressed relative to atmospheric pressure.
Head
Fluid head, a pressure difference due to a difference in height.
HSTOP, LSTOP
PG7601 high stop and low stop, piston maximum end of stroke positions.
Measurement Mode
Mode in which ADCS-601-AF is defining pressures. These include gauge (pressure relative to
atmospheric pressure) and absolute (pressure relative to vacuum).
MS (Mass Set)
A group of masses used on the PG7601 piston gauge. In ADCS-601-AF the mass set is a an
AMH-38 mass set with a nominal total mass of 38 kg.
Mass Bell
The combination of parts that is loaded onto the piston to carry the masses. This includes the
sleeve that is slid over the piston, the binary mass tray and the lifting shaft..
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.
N2
Nitrogen gas.
Nominal Mass
The mass loaded on the piston in terms of the nominal values written on the individual masses.
See also True Mass.
P-C
Piston-cylinder, piston-cylinder module.
PRT
Platinum Resistance Thermometer. The element used in the piston-cylinder mounting post to
measure temperature.
Ready/Not Ready
Indication of when conditions are present to make in tolerance pressure definitions based on
specific criteria for each condition.
Reference Bench
Main ADCS-601-AF system component. Wood top bench onto which the system pressure
stands are installed.
Reference Level
Height at which pressures are defined. PG7000 defines pressures at its reference level. Fluid head
corrections correct the pressure relative to the reference level.
Reference Pressure,
Reference Pressure
Circuit
The pressure against which pressures are defined by the ADCS-601-AF system. Vacuum in
absolute measurement mode; atmosphere in gauge measurement mode.
TEST(+)
Port to which the ADCS-601-AF system sets absolute or gauge pressure.
TEST(-)
Port connected to the reference circuit of the ADCS-601-AF pressure standards. In gauge
mode, the DUT “low side” can be connected here to assure a common atmospheric reference
on the DUT and the pressure standards. Port not used in absolute mode.
True Mass
The actual mass loaded on the piston using the measured value of each mass. See also
Nominal Mass.