3.11 Calibration; Measurement Calibration - Olympus EPOCH 650 User Manual

DMTA-10055-01EN, Rev. A, February 2015
The EPOCH 650 is also capable of outputting alarm signals through the Digital Out
connector on the back panel of the instrument (see "Alarm Outputs" on page 137).

3.11 Calibration

The EPOCH 650 can be easily calibrated for both zero offset and velocity in order to
provide accurate thickness (sound path) measurements from indications. The
EPOCH 650 utilizes an auto-calibration system for a simple, two-point approach. See
"Calibration" on page 143 for more detailed calibration information.
3.11.1

Measurement calibration

Calibration for accurate digital measurements is typically accomplished using two
known thicknesses of a representative material. In this section, the terms thin and
thick are used to refer to either two thicknesses of a block or plate (straight beam
calibrations) or two lengths of an angled sound path (angle beam calibration).
To begin calibration
1. Couple the transducer to the thin step of the material.
2. Position gate 1 around the resulting indication on screen.
3. Press 2 ND F (AUTO XX%) to bring the indication to 80 % of full screen height.
4. Choose the Auto Cal menu item (see Figure 3-13 on page 63).
62 Chapter 3