Download Manual - Crucible Technologies

Crucible Technologies
6
OPERATION
SUPPLY
The unit is designed to be powered from the mains 230 V, 50 Hz. Versions of the
unit powered from 110 V can be supplied. Please contact your supplier for this
voltage option.
PHONE SOCKET
The phone socket is fed from a 48 V source. When the polarity switch is set to
positive, A is positive wrt B. This is reversed when the polarity switch is set to
negative.
When the line current is set to Hi, this represents a 1 km line and when set to Lo it
represents a 7.5 km line.
The pin configuration on the socket is representative of a standard phone socket
on the wall and is as follows:
A
B
E
S
⇒
⇒
⇒
⇒
Pin
Pin
Pin
Pin
2
5
3
4
Within the LABLINE, there is a 1.8 µF/250 V capacitor to feed the ringing to the
UUT. This capacitor is connected between pins B and S.
NOTE: 4mm sockets are also provided. They are connected to pins A and B.
These are useful as measurement points or to connect any adapters.
RINGING
The ringing is applied to the UUT by operating the Ring On/Off switch.
The
ringing cadence is that of the standard UK PSTN.
The pre-set control at the back of the LABLINE can set the level of the ringing.
Once ringing is applied, it can either be stopped by operating the Ring On/Off
Labline
Issue 3.1