Rigol DM3068

RIGOL Chapter 1 Specifications
Service Guide for DM3068
1-10
Measuring Characteristics
Frequency and Period
Measurement Method
Reciprocal-counting technique, AC-coupled input using the AC voltage function.
Input Impedance
1MΩ ± 2% in parallel with <150pF capacitance on any range
Input Protection
750V rms on all ranges
Measurement Considerations
All frequency counters are susceptible to error when measuring low–voltage, low–frequency signals. Shielding inputs from external noise pickup is critical for
minimizing measurement errors.
Settling Time Considerations
Errors will occur when attempting to measure the frequency or period of an input following a dc offset voltage change. Make sure the RC circuit of input
terminal has been fully settled (about 1s) before accurate measurement.