RIGOL DM3058 - Manual (Page 122)

RIGOL
User’s Guide for DM3058/DM3058E 5-4
Loading Errors (AC Volts)
In the AC Voltage function, the input of DM3058/DM3058E appears as a 1MΩ
resistance in parallel with 100 pF of capacitance. The test lead that you use to
connect signals to the multimeter will also add additional capacitance and loading.
Table 5-2 shows the multimeter’s approximate input resistance at various
frequencies.
Table 5-2 Approximate input resistance at various frequencies
Input Frequency Input Resistance
100Hz 1MΩ
1kHz 850kΩ
10kHz 160kΩ
100kHz 16kΩ
For low frequencies:
Error (%)
% 100
1M Rs
R -
s
×
Ω +
=
Additional error for high frequencies:
Error (%)
% 100 1
) 2 ( 1
1
Ч








−
Ч Ч Ч +
=
in s
C R F
π
s
R
: source resistance
F
: input frequency
in
C
: input capacitance (100 pF) plus test lead capacitance