Model DMM7510 7½ Digit Graphical Sampling Multimeter Reference Manual
Section 2: General operation
DMM7510-901-01 Rev. B / May 2015
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10. To clear the Histogram, on the Data tab, select Clear Buffer. This clears the data from the
selected reading buffer and the statistics for the buffer, which in turn clears the Histogram.
An example of a histogram tab set for 25 bins is shown in the following figure.
Figure 104: Model DMM7510 Histogram
Automatic reference measurements
To ensure the accuracy of readings, the instrument must periodically get new measurements of its
internal ground and voltage reference. The time interval between updates to these reference
measurements is determined by the integration aperture that is being used for measurements. The
Model DMM7510 uses separate reference and zero measurements for each aperture.
By default, the instrument automatically checks the reference measurements whenever a signal
measurement is made. If the reference measurements have expired when a signal measurement is
made, the instrument automatically makes two more readings, one for the internal ground and one for
the voltage reference, before returning the result. This can cause some measurements to take longer
than normal.
This additional time can cause problems in test sequences in which measurement timing is critical. To
avoid the time that is needed for the reference measurements, you can disable the automatic
reference measurements.
When automatic reference measurements are turned off, the instrument may gradually drift out of
specification. To prevent inaccurate readings, you can use autozero once to update the autozero
information.
