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SDS2000X HD Series Digital Oscilloscope User Manual
1 8 0 i n t . s i g l e n t . c o m
Threshold Type
Percent: Set according to the percentage of the waveform. The setting range of lower value and
upper value is 1% ~ 99%, and the low value shall not be greater than the middle value and high value
Absolute: Set according to the vertical range. The absolute threshold value depends on the vertical
scale, offset and probe attenuation. These values should be set before setting absolute thresholds.
Lower and upper values are limited to the range of the screen. If any absolute threshold is greater or
less than the minimum or maximum waveform value, the measurement may be invalid.
Hardware Frequency Counter
The hardware frequency counter is a stand-alone, hardware-based frequency measurement function.
Differing from the “Frequency” parameter (see section “Horizontal Measurement”) which is measured
by software, the hardware frequency counter directly uses the trigger signal as the input of a hardware
counter, which yields 7-digit frequency measurement accuracy. The accuracy of the “Frequency”
parameter measured by software is relative to the sample rate. The lower the sample rate, the worse
the accuracy. In situations where the sample rate is less than 2 times the input frequency, the results
will be incorrect. The hardware frequency counter does not have this limitation. Its result is always
shown at the top-right of the display as shown below:
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