RIGOL
Service Guide for DM3000 Series
Frequency and Period Characteristics
Accuracy Specifications (% of reading)
[1]
Temperature
Coefficient
0 ℃ to 18 ℃
28 ℃ to 55 ℃
Notes:
[1] Specifications are for 60 minute warm–up.
[2] For AC input voltages 10% to 120% of range except where noted. 750V range limited to
750VRMS. 200mV range specifications are for full scale or greater inputs. For inputs from 20mV
to 200mV, multiply total % of reading error by 10.
[3] For the 20mA, 200mA, 10A ranges, the AC input current from 10% to 120% of range except
where noted. For 1A range, the AC input current from 50% to 120% of range except where
noted.
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 (up to 1
sec) before the most accurate measurements are possible.