RIGOL M300 - Manual (Page 125)

RIGOL
© 2007 RIGOL Technologies, Inc.
User’s Guide for DM3000 Series
5-5
Frequency Period Characteristics
Accuracy Specifications (% of reading) [1]
Function Range [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
[1] Specifications are for 60 minute warm–up and select 6½ reading resolution.
[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.