114 34410A/11A/L4411A User’s Guide
4 Measurement Tutorial
Other Primary Measurement Functions
Frequency and Period Measurement Errors
The multimeter uses a reciprocal counting technique to measure frequency and period.
This method generates constant measurement resolution for any input frequency. The
multimeter's ac voltage measurement section performs input signal conditioning. All
frequency counters are susceptible to errors when measuring low–voltage,
low–frequency signals. The effects of both internal noise and external noise pickup are
critical when measuring "slow" signals. The error is inversely proportional to frequency.
Measurement errors also occur if you attempt to measure the frequency (or period) of an
input following a dc offset voltage change. You must allow the multimeter's input dc
blocking capacitor to fully settle before making frequency measurements.
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