UNI8: universal 415
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
6.20.2.5 Balancing and shunt calibration
The amplifier offers a variety of possibilities to trigger bridge balancing:
Balancing / shunt calibration upon activation (cold start) of the unit. If this option is selected, all the
bridge channels are balanced as soon as the device is turned on.
Balancing / shunt calibration via the CAN-Bus. Select the CAN-message ID on the Balance tab.
The message's 4th bit must be "1" (0x10) in order to trigger balancing.
The message's 5th bit must be "1" (0x20) in order to trigger shunt calibration.
Balancing / shunt triggered by the button: CANSAS-UNI8's button can be used to initiate balancing
of all bridge channels. For this purpose, the button's function must be specified on the General-tab
as Activate balance.
It is possible to perform balancing / shunt in the Measure-window belonging to the CANSAS
configuration software for each bridge channel separately. The channels to be balanced must be
selected.
In shunt calibration, the bridge is unbalanced by means of a 174.7 kΩ shunt (between +VB and +IN).
The results are:
The procedures for balancing bridge channels also apply analogously to the voltage measurement mode
with zero-balancing.
We recommend setting channels which are not connected for voltage measurement at the highest
input range. Otherwise, if unconnected channels are in quarter- or half-bridge mode, interference may
occur in a shunt calibration!
If you use an imc measurement device to measure, see application notes in chapter Field Busses of the
imc DEVICES manual. There are examples how to use imc DEVICES- and imc CANSAS-software step by
step. Owner of a µ-Musycs can get an extract upon request.
Shunt calibrations are a special case: If at least one channel is set to Voltage, allow zero-balance and
no channel is set for bridge or strain gauge measurement, then upon activation of a shunt calibration,
both the status bar and the function Output status on LED will indicate a shunt calibration, but none
will be carried out. Conversely, if balancing is set, it will be indicated and carried out, too, upon
activation.
Note that importing a changed configuration to the module deletes any previously performed bridge
balancing and resets it to zero. Therefore, always repeat bridge balancing after importing a
configuration!
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