RIGOL
Service Guide for DM3000 Series
Measuring Characteristics
DC Voltage
Measurement Method: ΣΔ A/D conversion
Input Resistance:
200mV, 2V, 20V ranges Selectable 10MΩ ± 2% or >10GΩ
200V, 1000V ranges 10MΩ ± 2%
Resistance
Measurement Method: 4-wire or 2-wire.
Current source referenced to LO input.
Open-circuit Voltage: Limit less than 7V.
Max. Lead Resistance: 10% of range per lead for 200Ω, 1kΩ range. 1kΩ per lead
(4-wire ohms) on all other ranges.
Input Protection: 1000V, all ranges.
DC Current
Shunt Resistor: 0.025Ω for 1A, 10A
1.025Ω for 200mA
11.025Ω for 2mA and 20mA
Input Protection: Externally accessible 10A, 250V fuse
Internal 12A, 250V fuse
Continuity / Diode Test
Measurement Method: 1mA ± 0.2% test current, Limit in <7V
Response Time: 25 samples / sec
Continuity Threshold: Adjustable from 1Ω to 2000Ω
Input Protection: 1000V
True RMS AC Voltage
Measurement Method: AC-coupled True RMS – measures the ac component of input
with up to 400Vdc of bias on any range.
Input Impedance: 1MΩ ± 2%, in parallel with <100pF
Input Protection: 750VRMS all ranges
True RMS AC Current
Measurement Method: Direct coupled to the fuse and shunt. AC-coupled True RMS
measurement (measures the ac component only)
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