Min Max Recording Mode; Smooth Feature (Power Up Option Only) - Fluke 27-II User Manual

27 II/28 II
Users Manual

MIN MAX Recording Mode

The MIN MAX mode records minimum and maximum
input values. When the inputs go below the recorded
minimum value or above the recorded maximum value,
the Meter beeps and records the new value. This mode
can be used to capture intermittent readings, record
maximum readings while you are away or record readings
while you are operating the equipment under test and
cannot watch the Meter. MIN MAX mode can also
calculate an average of all readings taken since the MIN
MAX mode was activated. To use MIN MAX mode, refer
to the functions in Table 8.
Response time is the length of time an input must stay at
a new value to be recorded. A shorter response time
captures shorter events, but with decreased accuracy.
Changing the response time erases all recorded
readings. Model 27 II has 100 millisecond response time;
Model 28 II has 100 millisecond and 250 s (peak)
response times. The 250 s response time is indicated by
"" on the display.
The 100 millisecond response time is best for recording
power supply surges, inrush currents, and finding
intermittent failures.
The true average value (AVG) displayed is the
mathematical integral of all readings taken since the start
of recording (overloads are discarded). The average
reading is useful for smoothing out unstable inputs,
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calculating power consumption, or estimating the
percentage of time a circuit is active.
Min Max records the signal extremes lasting longer than
100 ms.
Peak records the signal extremes lasting longer than
250 s.

Smooth Feature (Power Up Option Only)

When the input signal changes rapidly, "smoothing"
provides a steadier reading on the display.
To use the smooth feature:
1. Hold down  while turning the Meter on. The
display will read "'---" until  is released.
2. ) will appear on the left side
The smooth icon (
of the display to let you know that smoothing is
active.