RIGOL DM3058 - Manual (Page 131)

RIGOL
User’s Guide for DM3058/DM3058E 6-7
Frequency/Period Characteristics
Accuracy Specifications (% of reading + % of range) [1]
Function Range
Frequency
Range
1 Year
23℃±5℃
Temperature
Coefficient
0 ℃ to 18 ℃
28 ℃ to 55 ℃
Frequency
Period
200mV to
750V [2]
20Hz-2kHz 0.01+0.003 0.002+0.001
2kHz-20kHz 0.01+0.003 0.002+0.001
20kHz-200kHz 0.01+0.003 0.002+0.001
200kHz-1MHz 0.01+0.006 0.002+0.002
20mA to
10A [3]
20Hz-2kHz 0.01+0.003 0.002+0.001
2kHz-10kHz 0.01+0.003 0.002+0.001
[1] Specifications are for 30 minute warm–up.
[2] Unless otherwise noted, for frequency ≤100 kHz, the specifications are for AC input voltage
of 15% to 120% of range. For frequency >100 kHz, the specifications are for AC input
voltage of 40% to 120% of range. 750 V range is limited to 750Vrms. 200 mV range is full
range input or input that is larger than the full range. For 30 mV to 200 mV inputs,
multiply % of reading error by 10.
[3] Unless otherwise noted, the specifications are for AC input current from 15% to 120% of
range except where noted. 20mA range specifications are for full scale. For inputs from 5mA
to 20mA, multiply total % of reading error by 10. 10A range is for AC input current from
25% to 100% of range.
Measurement Characteristics
Frequency and Period
Measurement Method:
Reciprocal-counting technique. AC-coupled input using the ac voltage
or ac current measurement function.
Measurement attentions:
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.
Setting time attentions:
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.