Fluke 187 user manual Using AutoHOLD, Using MIN MAX

Getting Acquainted

Using AutoHOLD 2

Using AutoHOLD

WWarning

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.

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