Measurement Computing eZ-PostView rev.2.0 - Manual (Page 67)

eZ-Analyst 979595 Menus 3-9
Transducer
Gain Transducer Gain is used as auxiliary scaling to compensate for the
transducer amplifier gain. Gain is a multiplied function.
Calibration
Date This column displays the date and time of the last calibration. If any
channel value changes, even if the original number is restored, the
calibration date and time are automatically removed for that channel.
Start
Calibration
Measurement
Clicking this button starts the calibration process for all selected channels.
At the completion of the calibration, the measured mV and the Transducer
mV/EU value for the applicable channels are automatically updated.
Calibration Procedure, an Example
Accelerometer type - Piezotronics 303A03
Calibrator - Piezotronics 394B05 - 1.02 G (RMS) at 80Hz
Unit of acceleration - in/sec^2
Note: 1.02 G RMS is equivalent to 393.811 in/sec^2 (1G=386.089in/sec^2).
This is a linear scale, thus we will be selecting Lin in the Calibrator Scale column.
In this example we will be calibrating channel 1.
1. Attach the accelerometer to the calibrator (signal source). Connect the other end of the
accelerometer cable to the channel 1.
2. Set the FSV into a proper range (i.e. 32.4 mV) in the Input Channels Setup window,
then click the <Apply> button.
3. Set the desired blocksize in the Analyzer Tab if a block size of greater than 4096 is
desired.
4. Set the “No. of Averages” in the Analyzer Tab if an average count of greater than 5 is
desired.
5. Open the Calibration Window from the Task Menu, or from the Input/Output Channels
Tab.
6. Select “Single Channel.”
7. Select “Auto Range,” if desired.
8. Select a Calibration domain. In this case, either “Time” or “Frequency” can be selected.
9. Enter 80 Hz in the Calibrator Frequency field.
10. Ensure the radio button for Channel 1 is enabled (in the Active column.)
11. Select RMS for the Calibrator Type.
12. Select Linear in the Calibrator Scale field.
13. Leave EU dB Reference set at 1.000. Note that this step can be skipped when linear
scale is used.
14. Set Calibrator EU at 1.02 ; implying an engineering unit of 1G.
15. Enter 393.811 in the Transducer mv/EU field.
16. Leave the EU Offset at 0.0000. We are assuming no offset in this example.
17. Leave 1.000 as the Transducer Gain. No amplifier or attenuator is being used in our
example.
18. Click <Apply> so your new values will not be lost.
19. Click the <Start Calibration Measurement> button to begin calibration.