Min/Max detector

Min/Max detector
The Min/Max detector I/O detects minimum or maximum values of the source's data. Every time the source of the Min/Max detector signals new data, the detector will compare each value in memory to the new source data and keep the smallest or largest value, depending on if minima or maxima are detected.

Typical applications of the Min/Max detector I/O are glitch capturing and capturing intermittent signal changes.

In the figure below, the spikes (maxima) in a sinusoidal signal (green) are detected by a Min/Max detector (yellow).

Min/Max detector

Hint: With two Min/Max detector I/Os, envelope mode can be made. Create two Min/Max detectors, connect both to the same source, set one to detect maximum values and the other to detect minimum values. Show both in the same graph, on the same axis.

Properties and actions

To control the behavior of the Min/Max detector I/O, several properties are available. These can be accessed through a popup menu which is shown when the I/O is right clicked.


When the Minimum property is set, the Min/Max detector I/O detects and keeps minimum values.


When the Maximum property is set, the Min/Max detector I/O detects and keeps maximum values.


Optionally a Fall-off percentage can be set. If this percentage is not zero, the output will slowly fall back to the input signal. The higher the fall-off percentage, the faster the memory values of the detector will fall in the direction of the source values. The effect can be compared to a VU-meter with peak detect.


The Count property determines how many measurements are processed. Several standard values are available, as well as a user defined setting.

Stop after count

When the Stop after count option is checked, the Min/Max detector I/O will stop processing data when Count measurements have been collected.

Only expand

When the Only expand property is set, the data size of the Min/Max detector I/O gets higher when the source's data size grows, but does not shrink when the source's data does. This can be useful when detecting minima or maxima of a source with varying data size.


The Min/Max detector I/O can be manually cleared with the Clear action. The data will be made equal to the data in its source.

Common properties and actions