F.W. Bell 7030, Instruction Manual

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F.W. BELL Model 7030 Gauss/Tesla Meter Instruction Manual
Section 6 – Flux Density Measurement 6-11
HOLD
FUNCTION
In some applications it may be desirable to “hold” a reading that is either
greater than (MAX hold) or less than (MIN hold) all previous readings. Also,
it may be necessary to capture the high (PEAK hold) and low (VALLEY
hold) extremes of rapidly changing pulses. The hold functions will hold their
readings until reset by the user.
MIN and MAX HOLD General Description
The MIN and MAX hold functions are useful in determining the maximum or
minimum value of magnetic events that occur over a period of time. The
MIN and MAX use readings that are arithmetically calculated by the
instrument for slow changing signals.
The MAX hold function holds the reading that is arithmetically greater than
all previous readings. For instance, a reading of +125.0 is greater than
+99.0 or –150.0.
The MIN hold function holds the reading that is arithmetically less than all
previous readings. For instance, a reading of -125.0 is less than -99.0 or
+150.0.
If the reading exceeds the limit of the selected range the MIN and MAX
functions will display “
OverRange”
in place of minimum and maximum flux
density readings.
PEAK and VALLEY General Description
PEAK and VALLEY hold modes are used to track rapid events such as
magnetizing pulses. Unlike MIN and MAX, PEAK and VALLEY are not
arithmetically processed by the instrument. They represent the extremes of
a flux density waveform that have been captured within the response times
of the instrument. The response times of these functions are listed in
Section 2 – Specifications .
Numerically, The PEAK hold function holds it’s reading the same as the
MAX hold function. The PEAK hold function holds the reading greater than
all previous readings, within the response time of the instrument. For
instance, a reading of +125.0 is greater than +99.0 or –150.0.
Numerically, The VALLEY hold function holds it’s reading the same as the
MIN hold function. The VALLEY hold function holds the reading that is
lower than all previous readings, within the response time of the instrument.
For instance, a reading of -125.0 is less than -99.0 or +150.0.