Atec Fluke-7250 Series - Manual (Page 2)

2 Fluke Calibration Series 7250 Ruska Pressure Controller/Calibrator
longer required. And, since the performance of
the 7250xi and 7250i is continuous throughout
the range, the time consuming task of control-
ling to atmosphere and switching ranges is
eliminated.
The 7250xi and 7250i not only provide
unequalled precision, but also excellent long
term stability due to the inherent properties of
quartz in combination with several enhance-
ments implemented over the last few years. The
total uncertainty of the 7250xi and 7250i over
a one year calibration interval is 0.009 % of
reading down to 5 % and 25 %, respectively (see
the table, above right). Simplified specifications
eliminate guesswork and “specmanship” to
allow you to determine the actual performance
delivered with every instrument.
Standard precision
For applications that do not require the level of
performance provided in the 7250xi or 7250i,
the Model 7250 offers an economical approach
to automatic pressure testing and calibration
with a precision of 0.003 % of full scale for
ranges to 2 500 psi (17.2 MPa).
High pressure precision
For applications that require pressures up to
3 000 psi (21 MPa), the Model 7250HP provides
total uncertainty (one year calibration interval)
of 0.013% of reading down to 30% of the full
scale. The 7250HP provides the high speed
control and performance of the standard 7250
with a full scale pressure range of 3 000 psi
(21 MPa) absolute.
High-speed pressure
control
All Series 7250 instruments
up to 2 500 psi (172 bar) reach
setpoint in 20 seconds or less
into a 15 cubic inch (245 cc)
volume, with no overshoot, to
allow high-speed pressure test
and calibration.
Dual control modes
The Series 7250 also provides
two user-selectable control
modes: active and passive
The Series 7250 features a unique fused-
quartz sensor. This rugged transducer offers
unequalled precision and a stability of
0.0075 % of reading per year.
mode. In active mode, the 7250 is continually
maintaining the setpoint and can compensate
for small leaks and pressure changes due to
temperature. In passive mode, the user defines
a control band and the 7250 will turn off the
controller once it achieves the setpoint within
the control band. In a leak-free and tempera-
ture-stable system, passive mode contributes
no additional uncertainty, providing optimum
performance.
Automating pressure test and
calibration
The 7250xi, 7250i and 7250 are easy to use and
can automate your calibrations in several ways:
Step up/down: for calibrations where the
increments are fixed intervals, enter a user-
defined step value. The Series 7250 increases
or decreases the pressure by the step amount
with the jog dial—no more lengthy keystroke
sequences to program.
Sweep test: for simple exercising routines,
as with dial gauges, enter a start value, a stop
value, and number of times to repeat the cycle.
The Series 7250 will automatically exercise the
device under test prior to the calibration run.
Onboard programs: For frequently used or
lengthy calibrations, the Series 7250 can store
up to 20 user-defined programs/profiles with up
to 1000 steps total in internal memory.
Computer interface: Every Series 7250 is
provided with both an RS-232 and IEEE-488
interface, and Series 7250 syntax follows SCPI
protocol for easy programming. CoMPASS ® ,
an off-the-shelf software package is avail-
able in addition to the LabVIEW ® driver, a free
download and optional MET/CAL ® driver. As
a standard feature, software written for the
previous generation Series 7215, 7010 and 6000
instruments is fully supported by the Series
7250. The Series 7250 can also be set to 510
emulation mode to use software originally writ-
ten for the DPI 510. Firmware updates can also
be performed over the RS-232 interface.
Versatility to handle any pneumatic
pressure calibration
The Series 7250 is versatile enough to handle
almost any type of pneumatic pressure
calibration.
Wide pressure range: available with any full
scale pressure between 5 and 2 500 psi (35 kPa
and 17.2 MPa) or for higher pressures select the
3 000 psi absolute (21 MPa) range.