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RIGOL

User’s Guide for DM3000 Series

5-5

Frequency Period Characteristics

Accuracy Specifications (% of reading)

[1]

Function Range

Frequency

Range

24 Hour

[2]

Tcal±1℃

90 Day

Tcal±5℃

1 Year

Tcal±5℃

Temperature

Coefficient

0 ℃ to (Tcal–5 ℃) (Tcal

+ 5 ℃) to 55 ℃

3Hz-5Hz 0.07 0.07 0.07 0.005

5Hz-10Hz 0.04 0.04 0.04 0.005

10Hz-40Hz 0.02 0.02 0.02 0.001

200mV

to 750V

[3]

40Hz-300kHz 0.005 0.006 0.007 0.001

3Hz-5Hz 0.07 0.07 0.07 0.005

5Hz-10Hz 0.04 0.04 0.04 0.005

Frequency

Period

20mA

to 10A

[4]

10Hz-10kHz 0.005 0.006 0.007 0.001

[1] Specifications are for 60 minute warm–up.

[2] Relative to calibration standards.

[3] For AC input voltages 10% to 120% of range except where noted. 750V range limited to 750VRMS.

100mV range specifications are for full scale or greater inputs. For inputs from 10mV to 100mV, multiply

total % of reading error by 10.

[4] 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.

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