eZ-Analyst
989090
Menus
3-5
An Example of Auto-Ranging
Maximum FSV set at 25.7 V
Minimum FSV set at 0.2 V
Upper Limit set at 90%
Lower Limit set at 10%
Increasing Factor set at 1.5
Decreasing Factor set at 1
In this example we have set the radio button for
Current FSV
instead of
Minimum
or
Maximum
(note 2). The starting value, in the example, is 0.20 V.
In the
first iteration
we see
that we have a peak of 0.19 V.
This falls outside of our band of
0.02 to 0.18 V that was
established by our upper and
lower limit percentages; i.e.,
90% of the Current FSV and
10% of the FSV.
An Example of Auto-Ranging
As a result, the Current FSV is increased by a factor of 1.5 (our Increasing Factor) and the
Current FSV becomes 0.30 V. Our limits, in volts, also changed since we are now looking
at percentages of 0.30 volts instead of the same percentages of 0.20 volts.
In the
second iteration
of our example, we see a 0.22 volt peak. This value is within our
established limits so the Current FSV does not change.
Note 1: If the Capture Mode is the Input Channel (Trigger Mode), the Auto Range process waits for a
trigger.
Note 2: A Start FSV of Minimum or Maximum can selected instead of Current FSV, as in our example.
Minimum FSV is the default.
Task Menu
>
Calibration
When calibration is performed, a signal of known Peak level [or RMS value] is supplied to a
transducer that is connected to an active input channel. An accelerometer calibrator or piston
phone is typically used to generate the calibration signal for vibration sensors and microphones,
respectively.
Examples:
Accelerometer calibrators
typically make use of
linear
engineering
units and, as their name implies, are used for calibrating
accelerometers.
Piston phones
are most often used for calibrating microphones
.
Piston
phones typically make use of decibel (
dB
) engineering units.
eZ-Analyst
includes a Calibration window for selecting the channels to be calibrated and for
entering several signal-related parameters. In addition, the calibration is actually started from
the window.
