Omega Engineering OME-A8111 manual Calibration VR Description

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:

zOne 6-digit multi-meter.

zOne stable voltage source (4.9988V)

zDiagnostic 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

VR1

PGA

VR5

8 ch. Mux

VR2

O.P.

CN1

OME-A-8111 Hardware Manual (ver.1.1, Jul/2003) 29