Rigol DM3068, Service Manual

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RIGOL Chapter 1 Specifications
Service Guide for DM3068 1-8
CMRR (common mode
rejection ratio)
70 dB, for the 1 kΩ unbalance in LO lead, <60Hz,±500VDC peak maximum.
True RMS AC Current
Measurement Method
Direct coupled to the fuse and shunt; AC-coupled True RMS measurement (measure the AC component only).
Crest Factor ≤ 3 at full range
Max. Input DC + AC current peak value <300% of range. The RMS current <10A rms including the DC component.
Shunt Resistor 100Ω for 200uA, 2mA
1Ω for 20mA , 200mA
0.01Ω for 2A, 10A
Input Protection Externally accessible 500mA, 250V fast blow fuse at the rear panel for 200uA, 2mA, 20mA and 200mA ranges.
Internal 10A, 250 V slow blow fuse for 2A and 10A ranges.
Settling Time Considerations
The default measurement delay is selected to give first reading right for most measurements. Make sure the RC circuit of input terminal has been fully settled
(about 1s) before accurate measurement.
Applying >300Vrms (or >5Arms) will cause self-heating in signal-conditioning components and these error are included in the instrument specifications.
Internal temperature changes due to self-heating may cause additional error on lower ac voltage ranges. The additional error will be lower than 0.02% of
reading and will generally dissipate within a few minutes.