Rigol DM3058 Manuel d'utilisateur télécharger pdf (Page 123)

RIGOL

User’s Guide for DM3058/DM3058E

5-5

Application of the Analog Filter

The analog filter of DM3058/DM3058E can be used to reduce the influence of the

AC component in DC measurement. For most measurement, the filter may not

require, but sometimes it can improve the DC measurement. For instance, if the DC

electrical source to be measured has a big AC ripple, it can be reduced by the

analog filter.

The analog filter cannot be used to filter the internal noise of the multimeter. 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. To reduce the offset, the multimeter

should be cleared under the selected range and reading rate when using the

analog filter. If you cannot clear the multimeter, the measured results will have

errors as shown in table 5-3 and 5-4. For other ranges and reading rates, the

additional error generated the filter can be omitted.

Table 5-3 Analog Filter Error in DCV measurement

Range

Reading Rate

Additional Analog Filter Error

200mV

Slow

10μV

Medium

20μV

Fast

20μV

Slow

15μV

Medium

20μV

Fast

20μV

20V

Slow

0.8mV

Medium

1mV

Fast

1mV

Table 5-4 Analog Filter Error in DCI measurement

Range

Reading Rate

Additional Analog Filter Error

200μA

Slow

0.002% range

Medium

0.005% range

Fast

0.005% range

20mA, 2A

Slow

0.040% range

Medium

0.060% range

Fast

0.080% range

200mA

Slow

0.004% range

Medium

0.010% range

Fast

0.010% range

10A

Slow

0.008% range

Medium

0.010% range

Fast

0.010% range

1 2 ... 118 119 120 121 122 123 124 125 126 127 128 ... 137 138

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Rigol DM3058 Manuel d'utilisateur Page 123

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