Calibrating The Stap; Sample Flow Lfe - BRECHTEL STAP 9406 Instrument Manual

• Confirm no errors during installation and that the firmware update runs with
a successful message window when completed.
• Move the program/data switch back to the data position (push the switch away
from the green circuit board).
For products with older versions of firmware (e.g. before version 3.0), contact the factory
for additional instructions on manually entering the calibration coefficients.

11.2 Calibrating the STAP

BRECHTEL provides the "STAP Calibrator.exe" program to allow you to easily recali-
brate your sample flow LFE, absolute pressure sensor, or the input power voltage read-
ing. To use the program, you must have a Windows PC (ver 7 to 10) with Labview 2011
Runtime Engine installed and a free USB port. Obtain the program from BRECHTEL or
your local technical representative if you cannot find it on the USB stick that shipped
with your STAP. Copy the program to the "STAP" folder on the C drive. Connect the
STAP via a USB cable to the PC USB port and be sure the STAP baud rate is set to USB in
the firmware.

Sample Flow LFE

Follow the steps below to re-calibrate the LFE in the STAP.
• Be sure to warm up the device for atleast 30 minutes before performing a cali-
bration.
• You will need a small vacuum pump (2 lpm of critical flow), tubing, and a reg-
ulating needle valve to control various air flow rates through the LFE.
• Run the calibrator program and select the correct version of firmware
• In the program under Filter select "Previous"
• In the program, set STAP Control to OFF
• Record the current values of the calibration coefficients and calibration tem-
perature
83-00036-01A STAP 9406
11 Appendix
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