RE: Checking whether a TV is not on

["Kevin Hawkins" <lists@xxxxxxx>]

There are some current sensor type probes available that can tell you via a
'logic' type output whether any mains powered device is ON or OFF. LA I
think do them as do the Comfort people - and I think maybe Xantech ??

The mains cable needs dividing such that only one of the conductors (live
O=
R
the neutral) passes through the sensor, which is a small current
transforme=
r
- (looks like a large polo mint).=20

The sensitivity of the ONOFF sensing can be adjusted by how many loops of
the mains wire are made around the current transformer (polo mint).  In
you=
r
case of a device like a TV that always draws current (even in standby) you
will need to experiment such that it shows OFF in 'Standby' but 'ON' in
use=
.
I guess the sensors provide a spec as to what minimal current turns them to
the ON state (with a single wire pass through the sensor) - and you could
check this against the current drawn in standby by your TV, which must be
less than this or the device would show ON permanently.

Kevin



> -----Original Message-----
> From: Ian Tresman [mailto:ian@xxxxxxx]
> Sent: 13 October 2003 12:03
> To: AutomatedHome UK
> Subject: [ukha_d] Checking whether a TV is not on
>=20
> There are X10 devices that will tell me whether a device is on or off.
>=20
> But is there anything that will tell me electronically whether a TV is
> not
> on, ie. off, or on standby?
>=20
> And then is there anything that will allow the remote switching of a
T=
V
> (or
> other device) to stand-by mode?
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> Regards,
> Ian Tresman
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>   ----------
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