Measurement Attentions
All frequency counters are susceptible to error when measuring low-voltage, low-
frequency signals. Shielding inputs is critical for minimizing measurement errors from
external noise.
Setup Time Attentions
Errors will occur when attempting to measure the frequency or period of the signal
with a DC offset voltage change. Make sure that the RC return at input terminal has
been in a stable state completely (higher than 3 s) before accurate measurement.
NOTE
[1]: 100 mV: the specifications are for AC input voltage of 35% to 120% of range in <20 kHz
frequency; 1 V, 10 V, 100 V, 750 V: the specifications are for AC input voltage of 35% to 120% of
range (750 V range is limited to 750 Vrms).
[2]: 100 μA to 10 A: the specifications are for AC input current of 20% to 120% of range (10 A
range is limited to 10 Arms).
[3]: 100 μA to 3 A: the specifications are for AC input current of 20% to 120% of range (3 A
range is limited to 3 Arms).
Capacitance Characteristics
Accuracy ± (% of reading + % of range)
[1]
Function
Range
[2]
Max. Testing
Current
1 year
23℃ ± 5℃
Capacitance
1.000 nF 200 nA 5 + 1.5
10.00 nF 200 nA 5 + 1.5
100.0 nF 2 μA 1 + 0.5
1.000 μF 10 μA 1 + 0.5
10.00 μF 10 μA 1 + 0.5
100.0 μF 100 μA 1 + 0.5
1.000 mF 0.5 mA 2 + 0.5
10.00 mF (for
DM858)
[3]
1 mA 2 + 0.5
Capacitance Measurement
Testing Method
Measure the rate of voltage change generated during the current
flowing into the capacitance
Connection
Type
2-wire
Input
Protection
1000 V on all ranges
Specifications
DM858 Series User Guide
132
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.
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