User`s guide

Measurement Tutorial 3
34450A User’s Guide 91
Other Primary Measurement Functions
Frequency measurement errors
The multimeter uses a reciprocal counting technique to
measure frequency. This method generates constant
measurement resolution for any input frequency. 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 of an input following a DC offset
voltage change. You must allow the multimeter’s input to
fully settle before making frequency measurements.