Specifications

RIGOL Chapter 1 Performance & Specifications
Service Guide for DM3058
1-10
Application of Analog Filter
The analog filter of DM3058 can be used to reduce the influence to measured results from AC
component in DC mode. For the most measures, 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 inside the meter, and which is no use
when measure short circuit in DC mode or measure the output of precise DC calibration instrument,
furthermore, on the contrary, it may lead l in additional noise and a bigger reading offset. To reduce
the offset, the multimeter should be cleared under the selected range and reading rate before using
the analog filter. If you cannot clear the multimeter, the measured results will have errors as shown
in table A1 and A2. For other ranges and reading rates exclusive of the list, the additional error can
be omitted.
Table A1: Analog Filter Error in DCV measurement
Range
Reading Rate
Additional Analog Filter Error
200 mV
Slow
10 μV
Medium
20 μV
Fast
20 μV
2 V
Slow
15 μV
Medium
20 μV
Fast
20 μV
20 V
Slow
0.8 mV
Medium
1 mV
Fast
1 mV
Table A2: Analog Filter Error in DCI measurement
Range
Reading Rate
Additional Analog Filter Error
200 μA
Slow
0.002% range
Medium
0.005% range
Fast
0.005% range
20 mA, 2 A
Slow
0.040% range
Medium
0.060% range
Fast
0.080% range
200 mA
Slow
0.004% range
Medium
0.010% range
Fast
0.010% range
10 A
Slow
0.008% range
Medium
0.010% range
Fast
0.010% range