Lab.gruppen PLM 20000Q - Manual (Page 75)

Back Panel Interface
69
PLM Series Operation Manual rev 1.2.3
Figure 8-12: IEC268 XLR Wiring and Pin Out
Pin 1: Ground / Shield
Pin 2: Hot (+)
Pin 3: Cold (-)
8.2.3 Unbalanced Operation
Balanced connections are recommended where possible. However, if it is necessary to drive the device
from equipment with an unbalanced output, wire the inputs as shown in Figure 8-13.
1 2
3
COLD
HOT
SCRN
COLD
HOT
SCRN
Unbalanced Output
(Typically phono)
Balanced Input
(XLR)
Figure 8-13: Balanced to Unbalanced Analog Wiring and Pin Out
The method shown in Figure 8-13 uses twin-and-screen (balanced) cable and standard XLR pin connections
at the PLM end, with the cold wire and the cable screen connected to the signal ground of the equipment at
the source end.
This usually provides better noise and hum rejection than the more common method of joining pins 1 and
3 together in the XLR. However, if only a single-core (unbalanced) cable is available, the method shown in
Figure 8-14 may be used.
1 2
3
HOT
SCRN HOT
SCRN
Unbalanced Output
(Typically phono)
Balanced Input
(XLR)
Figure 8-14: Unbalanced Analog Wiring and Pin Out