Rigol DM3061 - Page 21

RIGOL
Service Guide for DM3000 Series
1-7
Frequency and Period Characteristics
Accuracy Specifications (% of reading)
[1]
Function
Rang
e
[3
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 ℃
Frequency
Period
200mV
to
750V
[3]
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
40Hz-300kHz
0.005
0.006
0.007
0.001
20mA
to 10A
[4]
3Hz-5Hz
0.07
0.07
0.07
0.005
5Hz-10Hz
0.04
0.04
0.04
0.005
10Hz-10kHz
0.005
0.006
0.007
0.001
Notes：
[1] Specifications are for 60 minute warm–up and set reading resolution as 6½ .
[2] Relative to calibration standards.
[3] For AC input voltages 10% to 120% of range except special mark. 750V range is limited to
750VRMS. 200mV range is specified as full scale or greater inputs. For inputs from 20mV to
200mV, 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
special mark. 1A range is specified as the AC input current from 50% to 120% of range.
Measurement Considerations
Errors are brought within all the frequency counters when measuring low–voltage, low–frequency
signals. Shielding inputs could redound to reduce measuring errors brought from external noise.
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.