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AutoRec is mainly used to record raw signals. When recording raw signals, the memory consumption
grows very rapidly with time. So in order to monitor raw signals over a long time, only short segments
can be captured at a time.
When statistics are being monitored, the instrument has enough memory to be able to record non-stop
for weeks and months. So AutoRec is not really necessary.
AutoRec will capture a certain number of pre-trig samples (256 samples).
For instance AutoRec can be setup to:
•
Start recording a raw acceleration signal whenever the acceleration passes 0.2g.
•
Stop recording whenever the acceleration signal is < 0.2g for at least 10s.
AutoRec setup always requires two parameters:
•
A threshold to start the recording (Acceleration or Velocity). The recording will start as soon as
the signal passes the threshold.
•
A minimum duration to stop the recording. The recording will stop after the preset duration has
The threshold is set in ��/��
elapsed with the signal staying below the threshold.
that case, the threshold value �� defines a positive threshold +�� and a negative threshold −��. The
recording starts whenever the raw signal goes outside of the interval [−��, +��]. When measuring
The threshold applies to the raw signal if the instrument is set to record raw signal or signal statistics. In
acceleration signals without high-pass filter, the threshold is applied relative to the static acceleration at
the time when AutoRec is started. This way it is also possible to trigger a recording when the tilt of the
instrument changes by a predefined amount.
threshold value defines a positive threshold +��. The recording starts whenever the RMS value goes
outside of the interval [0, +��]
The threshold applies to the RMS level if the instrument is set to record RMS levels. In that case the
if the instrument is set to record raw velocity signals the trigger value �� represents a cube around the
origin (0,0,0), with a side-length of 2��.
In order to trigger the recording, the signal must pass the threshold on any individual axis. For instance,
WiFi™
7
Connectivity
The ABC Mems supports a mode of operation where it periodically connects to a server (a Windows
PC running the Instrument_Listener application) through WiFi™. This feature is designed to let the
instrument record autonomously, periodically report the levels or signals recorded since the last
connection, and optionally send emails with RMS-level or low-battery alerts. When set, this feature will
work, even if the instrument is reset, or if it loses and regains battery power (for instance if the
instrument is reconnected to a charger after the battery has been completely drained).
This PC-server being connected-to does not have to be in the vicinity of the instrument. It can be a
continent apart, as long as it is reachable through the internet, and all firewalls have been set to allow
the connection.
The instrument connects to a WiFi™ Router or Access Point that is in its vicinity. From there, it will find
the server to connect to, either by its IP address, or by its domain name.
User's Manual
for accelerations, and in ��/�� for velocities.
2
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