Frequency and Period Measurements

The GX2065 can perform frequency measurements from 3Hz to 500 KHz on voltage ranges of 100mV, 1V, 10V, 100V, and 300V. Period (1 / frequency) measurements can also be performed from 2µs to 333ms on the same voltage ranges as the frequency.

Input impedance: 10M ohm, AC coupled.

The instrument uses the volts input to measure frequency. The signal voltage must be greater than 10% of the full-scale range.

 Caution - The voltage limit is subject to the TBD Volts – Hz product.

Frequency and period measurement use a zero-crossing trigger, meaning that a count is taken when the signal crosses the zero level. The instrument 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.

Gate time for frequency measurement is programmable. The default gate time is 1 second. The GX2065 completes a reading when it receives its first zero-crossing after the gate time expires. In other words, the reading is completed 1/2 cycle after the gate time has expired. For example, to sample a 3Hz frequency, you may wait up to 1.33 seconds before a reading is returned.