Fluke 189 - Manual (Page 33)

Getting Acquainted
Using AutoHOLD
2
2-19
Using AutoHOLD
W
Warning
AutoHOLD mode does not capture unstable
or noisy readings. Do not use AutoHOLD
mode to determine that circuits are without
power.
To enter AutoHOLD, press OQ (AutoHOLD).
AutoHOLD mode freezes the present reading and its time
stamp. New readings now appear in the secondary
display. See Figure 2-6. When the meter detects a new,
stable reading (>4% change from last stable reading), it
beeps and displays the new reading in the primary
display. You can also force a primary display update by
pressing
Q .
If you remove the test leads (open the input), the meter
retains the last frozen primary display.
You cannot use AutoHOLD when MIN MAX is active. With
Model 189, you cannot initiate AutoHOLD while logging
data, but you can initiate logging when AutoHOLD is
active.
To exit AutoHOLD mode, press O Q (AutoHOLD)
again.
Using MIN MAX
The MIN MAX mode stores minimum (MIN) and maximum
(MAX) input values. When the input goes below the stored
minimum value or above the stored maximum value, the
meter beeps and stores the new value. MIN MAX mode
also calculates an average (AVG) of all readings taken
since the mode was activated.
Press
M
to enter the MIN MAX mode. The maximum
(MAX) reading is displayed first.
Each subsequent press of M steps through the
minimum (MIN), average (AVG), and back to the
maximum reading.
In the MIN MAX mode, the secondary display continues to
show the present measurement value.
The time elapsed since the MIN MAX mode was entered
is shown in the bottom right corner of each type of display.
See Figure 2-7.