User`s guide

Chapter 6 Specifications RIGOL
M300 User’s Guide
6-7
Measuring Characteristics
Frequency and Period
Measurement Method
Reciprocal-counting technique, AC-coupled input using the AC voltage function.
Input Impedance
1 MΩ ± 2%, in parallel with <150 pF capacitance on any range
Input Protection
300 Vrms 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 Considerations
Errors will occur when attempting to measure the frequency or period of an input following a dc offset voltage change. The input blocking RC time
constant must be allowed to fully settle (about 1 s) before the most accurate measurements are possible.