Fig. 14 Connection Of The Quarter Bridge - Beckhoff EPP3504-0023 Short Manual

Product overview
Fig. 14: Connection of the quarter bridge
Explanation:
• R1: external quarter-bridge resistor, nominally 120/350/1000 Ω
• R2: internal supplementary resistor, is set to the same value as R1 after the CoE setting "Interface",
and is therefore also 120, 350 or 1000 Ω
• R3, R4: high-resistance internal bridge supplementary resistors, therefore, do not significantly load the
internal supply
• Rs: switchable shunt resistor
• SW: internal switch for 2/3-wire operation; open: 3-wire operation
The strain relationship (µStrain, µε) is as follows:
For the quarter-bridge, N=1 always applies.
The relationship between U
44
/U and ∆R is non-linear:
Bridge Exc 1
Version: 1.2 EPP3504-0023