Use an oscilloscope for verification if you are in doubt about the frequency and waveform of your input signal. The cutoff
frequency setting range is very wide: 1 Hz – 50 MHz
Fig. 3-8 Digital LP filter operates in the measuring logic, not in the input amplifier.
4.1.5. Man/Auto
Toggle between manual and automatic triggering with this softkey. When Auto is active the counter automatically
measures the peak-to-peak levels of the input signal and sets the trigger level to 50% of that value. The attenuation is
also set automatically.
At rise/fall time measurements the trigger levels are automatically set to 10% and 90% of the peak values.
When Manual is active the trigger level is set in the value input menu designated Trig. See below. The current value can
be read on the display before entering the menu.
Speed
The Auto-function measures amplitude and calculates trigger level rapidly, but if you aim at higher measurement speed
without having to sacrifice the benefits of automatic triggering, then use the Auto Trig Low Freq function to set the lower
frequency limit for voltage measurement.
If you know that the signal you are interested in always has a frequency higher than a certain value flow , then you can
enter this value from a value input menu. The range for flow is 1 Hz to 100 kHz, and the default value is 100 Hz. The
higher value, the faster measurement speed due to more rapid trigger level voltage detection.
Even faster measurement speed can be reached by setting the trigger levels manually. See Trig below.
Follow the instructions here to change the low-frequency limit:
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