Omega Engineering OME-A8111 - Manual (Page 31)

3. Calibration
The OME-A-8111 is calibrated to its best state of operation. For environments with large
vibration, recalibration is recommended. Before calibrating the OME-A-8111, users should
have the following items:
z
One 6-digit multi-meter.
z One stable voltage source (4.9988V)
z Diagnostic program: this program is included in the delivered package
and will guide the user to in proceeding with the calibration.
3.1 Calibration VR Description
There are seven VRs on the OME-A-8111. Calibration is needed to adjust all seven VRs.
VR Num. Description
VR1 D/A Gain adjustment
VR2 D/A Offset adjustment
VR3 A/D Offset adjustment
VR4 A/D's Gain adjustment
VR5 A/D‘s PGA(Programmable Gain Amplifier) Offset Adjustment
VR4
A/D Converter
VR3
D/A Converter
PGA
VR5
VR1
O.P.
VR2
CN1
8 ch.
Mux
OME-A-8111 Hardware Manual (ver.1.1, Jul/2003) 29