BSA Flow Software Installation and User's Guide - CSI

Sync 1 signal is used with cyclic events to mark the beginning of a cycle or
revolution. Thus it should be generated once per cycle. The reset pulse from
an angular encoder can be connected to this input.
This signal is used in the Cyclic Phenomena add-on software to scale angle
or phase information.
Sync 2 signal can be used for encoder pulses. Each encoder pulse will be
time-stamped. This information is not used in the software, but it can be
exported and used to analyse e.g. fluctuations in the anguar speed.
Trigger edge sync. 1: can take the values Positive or Negative.
Determines whether the SYNC 1 input triggers on a positive going or
negative going edge of a trigger pulse.
Trigger edge sync. 2: see above
Reset encoder: used for once-per-revolution encoder pulses
Encoder: used for encoder pulses. This signal is connected to a counter,
which is read when a Doppler burst is detected. The counter is reset
whenever a “Reset encoder” pulse is received. The counter reading is used to
relate the velocity measurements to the angular position of the encoder. In
the Cyclic phenomena add-on, data can be sorted according to the angular
position for plotting e.g. velocity vs. angle. The angular resolution is defined
by the number of encoder pulses per revolution or per cycle.
If the angular speed is constant, the Sync 1 signal combined with the BSA’s
clock provide better angular resolution.
Start measurement: trigger input, will start data acquisition and hence the
BSA’s arrival time counter on the rising edge of a TTL pulse
Stop measurement: trigger input, will stop data acquisition on the falling
edge of a TTL pulse.
Note The same TTL signal can be used to start and stop the measurement, if both
Start measurement and Stop measurement are connected to it.
6.2.4 Synchronisation Outputs
Burst detector enable: this can be used as a gate signal to enable
measurements only during the time that this signal is high (TTL level). The
difference between this input and the start/stop inputs is that start/stop starts
and stops the arrival time counter, whereas the Burst detector enable just
enables or disables detection of bursts, while the arrival time counter keeps
counting.
Reference clock mode: can be Internal or External. Default is Internal. If two
or more BSA boxes are used together, one of them should have this property
set to internal, and the BNC connector “10 MHz Ref Out” from this unit
should be connected to the “10 MHz Ref In” on the other BSA(s), which
should have this property set to External.
These outputs are available on the “Programmable Output 1”
(synchronisation outputs) , “Programmable Output 2” (Shutter output), and
on the S1 connector, see
Table 6-3 and Figure 6-36.
The functions available are explained in section 6.2.5.
6-36 BSA Flow Software: Options and Add-ons