34410A/11A/L4411A User’s Guide 135
Specifications 5
Frequency and Period
Measurement Type: Reciprocal–counting technique. AC–coupled input using the AC voltage
measurement function.
Input Impedance: 1 MΩ ±2%, in parallel with <150 pF
Input Protection: 750 V rms all ranges
Measurement Considerations
All frequency counters are susceptible to error when measuring low–voltage, low–frequency signals.
Shielding inputs from external noise pickup is critical for minimizing measurement errors.
Settling Considerations
Errors will occur when attempting to measure the frequency or period of an input following a dc offset voltage
change. The input blocking RC time constant must be allowed to fully settle ( up to 1 sec. ). before the most
accurate measurements are possible.
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