RIGOL
User’s Guide for DM3058
Measurement Characteristics
True RMS AC Voltage
Measurement Method: AC coupled true-RMS-measure, the DC component of input with up to
1000V on any range.
Crest factor: Crest factor on full range ≤ 3
Input Impedance: 1MΩ ± 2% in parallel with 100pF on any ranges
Input Protection: 750VRMS on all ranges
AC filter bandwidth: 20Hz~100kHz
CMRR (common mode rejection ratio): 60dB (For the 1kΩ unbalanced resistance in LO lead and
<60Hz, maximum ± 500VDC).
True RMS AC Current
Measurement Method: DC coupled to the fuse and shunt. AC coupled true RMS measurement
(measures the ac component only)
Crest factor: Crest factor on full range ≤ 3
Max. Input: The DC + AC current peak value <300% of the range. The RMS
current including DC current is <10A.
Shunt Resistor: 0.01Ω for 2A, 10A
1Ω for 20mA, 200mA
Input Protection: Externally accessible 10A, 250V fast-melt fuse
Internal 12A, 250V slow-melt fuse
Setting time attentions:
Make sure the R circuit of input terminal has been completely stable before accurate
measurement.
Input >300Vrms (or >5Arms) will cause the self heating of the signal conditioning component to
generate error, this error is included in the characteristics of the instrument. Internal temperature
variation results from the self heating will cause additional error on ac range, this error is lower
than 0.02% reading, and it will disappear after a few minutes.
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