Fluke RUSKA 7050, Руководство пользователя

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RUSKA 7050, 7050 & 7050LP
Users Manual
6-8
To calibrate in Vacuum mode with the configuration shown in Figure 6-3, the following
actions should be taken. The system pressure and vacuum inlet valve should remain
closed. The bottom side of the piston must be open (vented) to atmosphere and connected
to the reference port of the DUT. The test port of the DUT must be connected to the bell
jar with a cutoff valve to isolate it from the DUT. Additionally, there must be a cutoff
valve located between the Vacuum pump and the bell jar.
Close the Cut-off valve to isolate the DUT test port from the bell jar. Open the Vacuum
Pump Valve to pull a hard vacuum on the bell jar to seal the bell jar and to float the
masses. Once the masses have risen in response to evacuation of the bell jar, close the
reference vacuum pump cutoff valve. Use the metering valve on the bell jar to adjust
(vent) the bell jar vacuum towards atmosphere until the masses begin to float. Close the
metering valve as soon as the masses begin to float. Open the bell jar cutoff valve to the
test port of the DUT, close the exhaust (Vent) valve, and use the pressure adjuster
handwheel to adjust float position of the deadweight gauge to float the piston at mid-float
position.
RPT Calibration — Simulated Absolute
A span correction can be applied to the RPT (barometric) sensor. This correction is done
using the PPI software and can be performed without removing the RPT from the PPI
chassis.
1.
Place the PPI in Measure mode. Remove all pressure sources from the system.
2. Connect a pressure standard to the Reference Port of the PPI.
3. If desired, change the PPI’s units of measure (see Chapter 4) to match those of the
calibration standard.
4. To access the Calibration screen, from the Main Menu, select MENU | CALIBRATE.
5. Select the atmospheric sensor by pressing the Sensor [F6] key until the words
Atmospheric Sensor are displayed above the calibration coefficients.
6. To begin the calibration process, press CALIBRATE. If the calibration access code is
enabled, enter it at the prompt. The first Calibration screen will appear.
7. You will use the calibration standard to apply the various pressures that will be
requested by the 7050. The screen will display a table noting the following
information;
Step The pressure step in the calibration sequence.
Apply The pressure that the standard is to generate to the PPI.
Actual The actual pressure value that was generated by the standard when the
point was accepted.
8. The Actual value will be highlighted. This is your first pressure point in the
calibration procedure. This calibration requires the generation of two pressures within
the range of 700 to 1100 mbar absolute. The selected pressures should be spaced as
far apart as possible within the allowable range.
9. Generate the first pressure. Enter the actual value of the applied pressure generated
by the standard and press ENTER.
10. Generate the second pressure. Enter the actual value of the applied pressure generated
by the standard and press ENTER.