Digital Multimeter HDM3055 Series Manual

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The Display and Digit Mask softkeys behave as they do in the Number display.

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The Scale softkey specifies the horizontal scale:

l Default sets the scale to equal the measurement range.

l Manual allows you to configure the scale either as High and Low values or as a Span around a

Center value. For example, a scale that goes from a Low of -500 Ω to a High of 1000 Ω could also

be specified as a Center of 250 Ω with a Span of 1500 Ω.

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Selecting a Secondary Measurement

Press 2nd Meas to select and display a secondary measurement. For example, for the DCV

measurement function, you can select ACV, Peak, or Pre-Math as the secondary measurement

function. With ACV selected as secondary, the display shows the DCV measurement as a number

near to top of the display, DCV in the bar meter, and the ACV measurement above the bar meter:

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Trend Chart  

To select the trend chart, press [Display] followed by the Display softkey:

In the Continuous measurement mode, the trend chart shows data trends over time:

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Recent/All

The Recent/All softkey shows either all of the data in the trend chart (All) or just the most recent

data (Recent). Neither selection clears reading memory.

In All mode, the trend chart displays all readings being taken and builds from left to right. After the

display is filled, the data becomes compressed on the left side of the display as new data is added

on the right side of the display.

Scaling

The Vertical Scale softkey specifies how the current vertical scale is determined.

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Press Vertical, to change the scaling:

l Default sets the scale to equal the measurement range.

l Auto automatically adjusts the scale to appropriately fit the line currently shown on the screen.

l Manual allows you to configure the scale either as High and Low values or as a Span around a

Center value. For example, a scale from a Low of 0 V to a High of 5 V is equivalent to a Center

of 2.5 V and a Span of 5 V.

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If you have enabled limits, the (Limits) softkey also appears. This sets the vertical scale to match

the limits.

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Histogram

The histogram shows measurement data as a graphical representation of the distribution of measurement

data. Data is grouped in bins represented by vertical bars in the histogram display.

NOTE Autoranging can adversely affect the histogram display when measuring repetitive signals spanning

multiple ranges. To avoid this, select a fixed range when using the histogram display.

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Pressing the key, followed by the Display softkey allows you to select the display type:

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Binning

The Binning softkey allows you to either let the instrument control how the histogram is binned

(automatic binning), or to manually specify the binning parameters with the Bin Settings softkey.

Changing any binning parameter, or switching between automatic and manual binning, will automatically

start the histogram over with new data.