HBM QuantumX MX840 Operating Manual page 152

Functions and outputs
RMS (root mean square) function
RMS is computed from one of the module's 4 analog input channels according to the
formulaL
Where f(x) denotes the input channel signal and T the time window (in ms).
Keep in mind the following notes when working with RMS channels:
S The maximum sample rate is restricted to 4800 (2400) Hz
S The output (sample) rate of the RMS channel must not be higher than the sample rate of
S Filters set for the MX878/879 do not apply to RMS channels. These channels are always
Peak Detection function
Keep in mind the following notes when working with peak monitor channels:
S The maximum sample rate is restricted to 4800 Hz
S The sample rate of the peak monitor channel must not be higher than the sample rate of
S The peak units do not accept other peak units or RMS as input
Each peak detection unit can monitor either the Min or the Max of one of 4 signals "visible as
isochronous" within the system.
A peak unit may operate in different modes:
S RUN: peak value will be continuously updated
S HOLD: last peak value will be "frozen"
S PEAK: peak detection enabled
S FOLLOW: peak detection disabled, i.e. the channel yields the original signal of the input
The following combinations are possible:
This also applies to the minimum values.
QuantumX
the input channel
unfiltered. However, the input signal is filtered
the input signal
channel
Graph for MAX−PEAK−RUN
Graph for MAX−PEAK−HOLD
Graph for MAX−Follow−HOLD
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HBM