53220A/53230A Measurements 3
Keysight 53220A/53230A User’s Guide 85
Input signal stability The stability of the input signal frequency during the
measurement can impact the counter's observable continuous (gap-free)
characteristic. As previously mentioned, all readings in the current reading count
are based on the number of edges required to complete the first reading which in
turn, are based on the specified or default gate time. If during measurements
before the sample count is reached the input frequency changes, the counter will
modulate the gate time of subsequent readings according to the frequency. The
edge count per reading as originally determined remains fixed and the readings
gap-free.
CONTinuous mode is available on channels 1 and 2 and optional channel 3 of the
53230A only, and only for frequency and average-period measurements.
Following a reset (*RST) or instrument preset (SYSTem:PREset or Preset key), the
measurement mode is set to AUTO. CONFigure and MEASure do not change the
mode.
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