Olympus 38DL PLUS User Manual

DMTA-10004-01EN, Rev. D, November 2016
Basic Operation 67
zero compensation is responsible for that task (see “Calibrating the Instrument”
on page 67 and “Material Sound Velocity and the Zero Calibrations” on page 71).
5.2.1 Calibrating the Instrument
When you want to make accurate measurements, you need to perform the following
calibrations:
• Material sound velocity calibration
•Zero calibration
You must perform the calibrations using a thick and a thin sample of precisely known
thicknesses. The sample must be made of the same material as the parts to be
inspected (see “Test Blocks” on page 70 for details on test blocks).
The following procedure is illustrated using a dual element probe and a 5-step test
block. Refer to “Calibration” on page 66 for more details on the calibration process.
To calibrate the instrument
1. To perform the material sound velocity calibration (see Figure 5-4 on page 68):
a) Place a drop of couplant on the surface of the thick part of the test block.
b) Couple the transducer to the thick part of the test block using moderate to
firm pressure.
The waveform and the thickness reading appear on the screen.
c) Press [CAL VEL].
d) When the thickness reading is stable, press [ENTER].
e) Using the arrow keys, edit the thickness value to match the known thick
thickness of the test block.

Olympus 38DL PLUS Specifications

General

Operating Temperature	-10 °C to 50 °C (14 °F to 122 °F)
Data Logger	Yes
Interface	USB, RS-232
Thickness Range	0.08 mm to 635 mm (0.003 in. to 25 in.) depending on material and transducer
Display	Backlit LCD
Battery Type	Three alkaline or NiMH AA cells
Pulser	Adjustable square wave pulser
Receiver Bandwidth	0.5 MHz to 20 MHz
Languages	English, French, German, Spanish, Italian, Russian, Japanese, Chinese
Resolution	0.001 mm or 0.0001 in.
Transducer Frequency	2 MHz to 30 MHz
Material	Plastic housing