14
c
HAPTER
3:
Operation
F71/F41 Teslameter
3.4 Basic
Operation
The Home screen displays readings such as magnitude, max hold, relative, XYZ (F71),
and frequency. Touch a box on the screen to navigate to a detail screen containing
more information.
The following quick access settings are also available on the Home screen:
D
Measurement Mode
D
Averaging Window
D
Range
3.4.1 Measurement
Modes
The F71/F41 teslameter can be configured for DC, AC, or high-frequency measure-
ments.
3.4.1.1 DC Measurement Mode
When absolute field values are desired, DC is the recommended measurement mode.
Averaging windows as short as 10 ms (100 readings per second) are possible, so even
fast moving fields can be characterized using DC mode. In DC measurement mode,
the display shows the measured DC field, the DC max hold, and the DC relative mea-
surement.
3.4.1.2 AC Measurement Mode
AC mode offers the highest level of accuracy for periodic fields. However, it is only
capable of measuring accurately over a limited range of frequencies. This is because
AC mode uses the TruZero™ measurement technique, delivering improved accuracy
at the expense of high-frequency capabilities. AC mode calculates DC level, AC RMS
component, peak values, and crest factor.
D
RMS:
the root mean square of the AC component of the field.
D
Peak to peak:
the difference between the smallest and largest samples acquired
during the averaging window.
D
Crest factor:
the ratio between the largest peak value and the RMS measurement.
D
DC offset:
the component of the field that is not changing. This includes fields that
have a period longer than the averaging window.
FIGURE 3-2
Measurement Mode
