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Carrier Frequency configuration and synchronisation

How to set up carrier frequency measurement in A106/A156 modules and how to synchronise to avoid noise.

The A106 module supports the supply of sensors with direct volt-
age (DC) or carrier frequency (CF).

The A156 module support only 4,8 kHz CF

If you are using several modules of this type and set carrier fre-
frequency supply, you should synchronise the carrier frequencies of
the modules, because otherwise crosstalk can occur between the
supply lines and the signal inputs of different modules. This then
leads to beats in the measurement signal.

The A106 provides bridge measuring (full, half and quarter) for both

  • CF (carrier frequency) excitation - either 600 Hz or 4,8 kHz
  • DC excitation

When using CF principle, the A106 offers the possibility to synchronise the inputs within the same module, and also for other A106 modules on the same UART. In this case 1 input is acting as “master” (internal synchronised) and provides the clock of CF for all other inputs (external synchronised).

It is only allowed to set up one input as master-input on one UART. The clock for all other modules is provided via the Q.bloxx socket on the Sync lines (the master input can be on any of the connected A106 modules). All external synchronised inputs have to be configured with the same frequency as the internal synchronised (master-)input.

After selecting a carrier frequency, you have three methods of
supply:


1. No sync.(hronization)
This setting is practicable when you are only using one mod-
ule with carrier frequency supply. Within a module all carrier
frequency generators are automatically synchronised.

2. Internal sync.(hronisation)
Set this type of synchronisation for one module. The module
then becomes the master to which all other modules synchro-
nise.

3. External sync.(hronisation)
Specify this type of synchronisation for all other modules so
that they synchronise to the master.
For synchronisation the Sync A and Sync B lines in the socket are
used (Fig. 4-6, page 29).
Tip
We recommend that only one variant of the carrier frequency is
used, i.e. do not mix 600 Hz and 4800 Hz.
Do not forget to save these settings in the module and the Test
Controller