Digital Multimeter HDM3055 Series Manual

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In the image below, the lower (left) limit border is red, indicating that the lower limit has been exceeded.

(The reading in the upper left corner (-01.68487 VDC) is within limits, so it is not red.)

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Histogram

The same color scheme applies to histograms. In the image below, the green vertical lines that

separate the black histogram background from the light red limit areas indicate that limits have

not been exceeded.

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In contrast, the 2.0474 VDC reading is highlighted in red to indicate that it is outside the limits.

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The border will remain red even if the trend line moves out of the limit area. When the trend line is

within limits, you can reset the borders to green by pressing Clear Condition.

Note also that the number of the newest displayed measurement, +01.9523 VDC below, indicates

whether the measurement is within limits. Because the limit is 2 V, the 1.9523 VDC value is shown

with the standard background.

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When a limit is exceeded, the border turns red. In the image below, the top border is still green,

but the bottom border has changed to red because the trend line has gone into the lower limit area.

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Limit Indications

The display uses colors to indicate limits and limit violations.

Trend Chart

The limit area is shown in light red on the graph. The limit borders are green (shown below) as long

as the limits have not been exceeded.

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The Beeper softkey enables or disables beeping when limits are violated (this also enables or

disables the beeper for the other functions that use the beeper - probe hold, diode, continuity,

and errors. Clear Condition resets the limit borders to green, as described below.

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The first softkey enables or disables limits. The second and third softkeys specify the limits either

as high and low values or as a span around a center value. For example, a Low limit of -4 V and

a High limit of +7 V are equivalent to a Center of 1.5 V and a Span of 11 V.

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Remarks

l The Span value is the Max minus the Min.

l Press Clear Readings to clear reading memory and re-start statistics calculation.

Math - Limits

Limit checking indicates how many samples have exceeded specified limits and visually indicates when

the limits are exceeded.

Front Panel Menus

The limits menu is accessed from the [Math] menu.