User manual

SIGLENT

SDM3055 Digital Multimeter 95

Loading Errors (AC Voltage)

In the AC Voltage function, the input of SDM3055 appears as a 1MΩ

resistance in parallel with 100pF of capacitance. The test lead that you use to

connect signals to the Multimeter will also add additional capacitance and

loading. The approximate input resistances of the Multimeter at different

frequencies are listed in the following table.

Table 5- 2 Approximate Input Resistances at Different Frequencies

Input Frequency Input Resistance

100Hz 1MΩ

1kHz 850kΩ

10kHz 160kΩ

100kHz 16kΩ

For low frequencies:

Error（%）= ×100%

For high frequencies:

Error（%）=[ -1] ×100%

F: input frequency

: source resistance

: input capacitance (100pF) plus test lead capacitance