Transducer Connected In The Four-Wire Technique; Cable Extension - HBK HBM Z7A Montageanleitung

5.2 Transducer connected in the four‐wire technique
Upon connection to amplifiers using the four‐wire circuit, the cores bl (blue) and gn
(green) should be connected, as should bk (black) and gr (gray). The following deviations
occur in the case of cable of original length (6 m): Sensitivity -0.4 % and temperature co­
efficient -0.02 %/10 K.
5.3

Cable extension

Extension cables must be shielded and of low capacitance. We recommend the use of
HBM cables, which satisfy these requirements.
HBM extension cables, 6 wires:
S
KAB8/00‐2/2/2 (sold by the meter, order‐no. 4‐3301.0071 = grey or
4‐3301.0082 = blue)
S
CABA1 (cable roll, order‐no. CABA1/20 = 20 m or CABA1/100 = 100 m in length)
With cable extensions it is important to ensure a good connection with minimum contact
resistance and good insulation.
When using the six‐wire circuit, the effects of resistance changes in the extension cable
are compensated. If you extend the cable using the four‐wire circuit, the sensitivity devi­
ation can be eliminated by adjusting the amplifier. However, temperature effects can only
be compensated when operating with the six‐wire circuit.
Route the load cell connection cable so that any condensed water or dampness forming
on the cable can drip off. It must not be able to reach the load cell. In addition ensure that
no dampness can penetrate the open ends of the cable.
Z7A
CONNECTION
Load cell
Connection cable
Humidity
9