SDM3055 Series Digital Multimeter User Manual
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Application of the Analog Filter
The analog filter of the Multimeter can be used to reduce the influence of the AC component in DC
measurement. Generally, the filter may not be required, but sometimes it can improve the DC
measurement. For example, if the measured DC electrical source has a big AC ripple, the analog
filter can reduce the influence.
The analog filter can’t be used to filter the internal noise of the instrument. It has no use in DCI
opening measurement, DCV short measurement or in measurement of the output from a precise DC
calibration instrument. On the contrary, it may lead in additional noise and a bigger reading offset.
The Multimeter should be cleared under the selected range and reading rate to decrease the
offset when using the analog filter. If you cannot clear the instrument, the measured results will
have errors. For other ranges and reading rates, the additional error generated by the filter can be
omitted.
Table 4-3 Analog Filter Error in DCV measurement
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