Beckhoff EPP3504-0023 Short Manual page 25

Measurement of small resistances
Especially for measurements in the range < 10 Ω, the 4‑wire connection is absolutely necessary due to the
relatively high supply and contact resistances. It should also be considered that with such low resistances
the relative measurement error in relation to the full scale value (FSV) can become high ‑ for such
measurements resistance measurement terminals with small measuring ranges such as EL3692 in 4‑wire
measurement should be used if necessary.
Corresponding considerations also lead to the common connection methods in bridge operation:
• Full bridge: 4‑wire connection without line compensation, 6‑wire connection with full line compensation
• Half bridge: 3‑wire connection without line compensation, 5‑wire connection with full line compensation
• Quarter bridge: 2‑wire connection without line compensation, 3‑wire connection with theoretical line
compensation and 4‑wire connection with full line compensation
EPP3504-0023
NOTE
Version: 1.2
Product overview
25