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 Characteristics mode
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Records compressed values like RMS or peak.
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 Signal mode
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Records real-time signals with the chosen data rate. Since these values may be very fluctuating the bar graph will show only the highest magnitude with the respective sign. | | |
 Data rate
In Signal mode you can decide whether the signals are recorded with maximum or with adaptive data rate.
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Maximum data rate
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The full sampling rate of the USB device will be used for recording:
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Adaptive data rate
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The recording data rate is set according to the used low pass filters. The sampling rate will be sufficiently high to meet the Nyquist criterion.
Example: All channels use a 10 Hz low pass. It is not necessary to sample with the full rate of 96 000 Hz. The sampling rate can be reduced to < 1000 Hz which will reduce the amount of data by 99 % without loss of information.
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 Digital input
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For automated test systems it can be advantageous to control VM-REC by an external trigger, which is a digital input of the USB devices. VM-REC starts when logic high level is detected and stops at low level.
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