HBK AED 9101D, Operating Manual

Page: 22 / 104

AED
ELECTRICAL CONNECTION
20
6.3 Transducer connection
You can connect SG transducers in a full bridge circuit with a total bridge resistance of
R
B
= 80 … 4000Ω (40 … 4000 Ω with the AED9101D). If the transducer resistance is more
than 1000Ω, however, you can expect increased noise (measurement ripple). Transducer
excitation is supplied at 5V
DC
(bridge excitation voltage) via the basic device.
When connecting several transducers, use the HBM VKKx junction box.
6.3.1 6­wire circuit (standard mode of operation)
HBM wire colors: bl = blue, gn = green, rd = red, wh = white, gr = gray, bk = black
bl
gn
rd
wh
gr
bk 3
3'
4
1
2'
2
1
7
bl gn rd wh gr bk
3 3' 4 1 2' 2
AED9101D, AED9501A
AED9201B, AED9301B, AED9401A
Fig. 6.3 Connect the transducer with 6-wire circuit in the basic device
(note HBM color and terminal coding)
Connection in a 6-wire circuit eliminates the effects of cable resistance. If you are using
several transducers, route the connection all the way to the junction box.
6.3.2 4­wire circuit
You have two options for connecting transducers in a 4-wire circuit:
1. Connection without an extension cable
Bridge the sense lead at the AED (Fig. 6.4).
2. Connection via a 6­wire extension cable
Bridge the sense lead in the transducer connector (Fig. 6.5).