Peekel Instruments User manual PICAS V2.6.1
Page 8 of 59
2.1.3 Bridgeconnector pinout
pin 1 : -EX (-excitation)
pin 2 : +EX (+excitation)
pin 3 : +IN (+input)
pin 4 : -IN (-input)
pin 5 : Gnd (ground)
pin 6 : -SE (-sense)
pin 7 : +SE (+sense)
pin 8 :
pin 9 : 1/4 (quarter-bridge completion resistor, 120 or 350 ohm)
The straingauge-bridges and lvdt’s are connected through 9-pole male DSUB connectors.
The pin connections are shown in the above table. The abbreviations are as follows:
±
EX
Excitation to the transducers. For the carrier-frequency-amplifier this is an ac-signal
of 0,5 to 5 volt at normally 5000 Hz. Although the polarity-signs do not have a meaning for
this ac-signal, they are used here to indicate the relation with +
IN
and -
IN
.
±
IN
Differential input of the amplifier. Like for the excitation, the polarity-signs wouldn’t
have a meaning if they weren’t used to indicate the relation with +
EX
and -
EX
. Connecting
+
EX
to +
IN
and -
EX
to -
IN
should give a positive (but overload) outputsignal.
±
SE
Sense-lines for 6-wire connection of full-bridges. The + SE and - SE connections
have to be connected (see diagrams at the next pages) in order to compensate for the
voltage drop of the EXcitation voltage over the lines, connected to the measuring sensors.
¼ Quarter-bridge completion resistor. (120Ω or 350Ω precision-resistor.). A single
external straingauge can be completed by the internal resistors in the other bridge-arms,
available through ¼-pin. The ¼-bridge completion resistor is internally connected to +
EX
.
With the settings a choice can be made between a 120 Ω or a 350 Ω internal
compensation resistor.
Gnd -ground. At this pin the ground from the system is connected. Normaly this pin is not
used
Screen When a cable is used with a screen, this screen must be connected to the
housing of the connector. For the optimal screening this housing must be metalised.
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