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G4 Multi Channel Force Instrument
3-1
3. Instrument Functionality
General
This chapter describes the functionality of the different parts of the force instrument.
Function Block
All measuring functions in the instrument are based on configurable function blocks.
A Function Block is used to calculate the force or web tension of one to four inputs and
the sums and differences if more than one input is used. With a four channel Function
Block there are intermediate sum of force/web tension values calculated (A + B and
C + D).
The Function Block type is selected with parameter ‘Func. Block X Type’ (Hardware
Configuration menu) and the value of the parameter can be set to ‘Not In Use’,
‘1 Channel’, ‘2 Channel’ or ‘4 Channel’. The type is selected individually for each used
Function Block.
A measuring channel, i.e. a connection on a WF IN / WF IN2 or HS WF2 module,
should be assigned to each Function Block input. The inputs of a Function Block are
named Input A to input D. Note that each measuring channel can only be assigned to
one Function Block input. Inputs cannot be shared between Function Blocks. The
maximum number of measuring channels in an instrument is 8 if WF IN2 modules are
used and 4 if HS WF2 modules are used.
A Function Block input can also be set to ‘Not In Use’ which means that the actual input
value used is always 0. This can be useful when using three transducers in a 4 channel
Function Block or for testing purposes.
In the menu Parameter Set-up – Calibration – Function Block 1 (- 8) are parameters for
configuration and calibration located. Only used Function Blocks are displayed in the
menu.
The calibration parameters shown in the
figure is for Function Block 1.
There are sets of calibration parameters for
each force input. Parameters named ‘1:A …..’
belongs to input A, parameters named
‘1:B …..’ belongs to input B and so on.
Calibration must be done for separately for
each input.
All other parameters (‘1: …..’) are common
for the whole Function Block.
In the instrument and throughout this manual
are outputs from Function Blocks used for Display, Analog Outputs, Levels,
Communication, etc. These Output Signals are explained in the tables below. The
actual value for each “Output” is depending on the Function Block type. E.g. if the sum
of inputs C and D, on a 4 channel Function Block, should be monitored on an analog
output, Output 2 should be chosen as the source for the analog output. Also the input
forces are available for monitoring etc, see ‘Common values’ later in this chapter.