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LaserSpeed Pro 8500-4 Instruction Handbook: Interfacing with the LS8500-4
When connecting to the Analog Output Voltage, the Analog Output Voltage and Analog Output Ground should
be on a separate twisted pair inside of a shielded cable. Connect a 0.1
F capacitor across the load end of
the cable (the end opposite the gauge) to reduce noise caused by other signals in the cable. See the follow-
ing wiring example:
Analog Output Wiring Example
4.2.2.4
Measurement Synchronization Input (Pins 8-9)
In many AGC applications, particularly mass flow control, it is desirable to synchronize the sampling periods
of all gauges in the system. This is done by connecting a LaserSpeed I/O Module to each LS8500-4 in the
system (for elongation), or by connecting the LS8500-4 gauges together in a daisy-chain configuration (for
synchronization only.)
Using the LaserSpeed I/O Module (one I/O Module per LS8500-4) easily allows multi-channel synchronization
and elongation measurement. The I/O Module has rear panel Sync connectors that can be connected to oth-
er I/O Modules for synchronization. For details about synchronizing multiple gauges using the LaserSpeed
I/O Module, refer to the LaserSpeed I/O Module Instruction Handbook. For details about how to connect mul-
tiple LaserSpeed gauges together for synchronization, see the
When two or more systems are synchronized, the speed data is synchronous, although there will be minor
variations in the actual output times from one I/O Module to the next. This means that all processors sample
over exactly the same time period, but due to minute differences in internal processing times, the output from
each processor may arrive a few microseconds earlier or later than the outputs of the other I/O Modules.
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