For
the determination of the resonant frequency of materials.
System
The E-Meter™ MK II has an automatic feature that computes
the aximum amplitude, which eliminates cumbersome frequency scanning.
Frequencies are automatically shown in the display and a cursor
allows the user to move along the frequency spectrum. Also the time
domain signal and the frequency spectrum can be stored and uploaded
to a PC for further analysis and inclusion in reports.
Resonance Frequency
The E-Meter™ MK II performs a Fast Fourier Transform that
allows the identification of the resonance frequency in the Frequency
Spectrum.
Durability of Concrete
The determination of flexural resonance is very important when studying
the degradation of concrete under accelerated freezing and thawing
cycles and aggressive environments on concrete specimens.
The advantage of resonance methods are:
- Tests can be repeated over a very long period on the same specimen;
the number of test specimens required is therefore greatly reduced.
- The results obtained with the resonance method on the same specimen
are more reproducible than those obtained with destructive tests
and groups of specimens.
Specifications
| Frequency range: |
from 10 Hz to 40 kHz |
| Sampling frequency: |
10, 20, 40 or 80 kHz |
| Frequency resolution: |
from 4.9 to 78.1 Hz |
| Record length |
1024 or 2048 points |
| Output bias level: |
9.2 V |
Accelerometer
sensitivity: |
9.60 mV/g (0.979 mV/m/s2) |
| Battery: |
12 Volt. 4-10 hours
continuous use |
| Display: |
320 by 240; backlit for
daylight use |
| Storage: |
200 plus readings |
| Software: |
Windows compatible
9x/me 32MB Ram |
| Impactors: |
Set of 6 hardened steel balls. |
Operating
Temperature Range: |
0°C to 40°C |
|
