Sam -
Your post was no doubt sent before I replied to John Allen.
FWIW, I'll try to add some clarity on the power cross
testing.
The power lines that are collocated with telecommunication
lines are typically medium voltage. There are both induced
voltages into and metallic power cross to the
You're welcome, John.
Yes, the test seems brutal. In North America, ringing is
maximum 105Vrms, possibly riding on up to a -56.5Vdc wetted
line (but not necessarily) and is limited to a few tens of
mA. 120V/1200Ohms is still only 100mA, but that doesn't
mean it won't cause grief at 3-5 times
they did not more closely specify the equipment to be used?
Regards
Johh Allen
-Original Message-
From: Peter L. Tarver [mailto:peter.tar...@sanmina-sci.com]
Sent: 12 December 2002 16:04
To: John Allen; emc-p...@majordomo.ieee.org
Subject: RE: TNV Test Generator
John, et al
John, et al -
No this is not the power cross test, which is described in
Annex NAC of CSA/UL60950, third ed. This test is intended
to simulate continuous ringing from the network, is akin the
an SELV reliability test and, IIRC, was added to the base
IEC 60950 standard at the behest of the
...@majordomo.ieee.org]On Behalf Of John Allen
Sent: Thursday, December 12, 2002 2:43 AM
To: emc-p...@majordomo.ieee.org
Subject: RE: TNV Test Generator
Hi Folks
Is this not just the old UL/CSA (UL 1457/1950 etc) test to simulate a 120V
power line falling onto the external POTS (etc)cable?
In which case
...@selinc.com [mailto:don_borow...@selinc.com]
Sent: 11 December 2002 22:19
To: emc-p...@majordomo.ieee.org
Subject: Re: TNV Test Generator
Am I missing something, or can you not just take a low impedance source of
120 VAC and simply add an external 1200 resistor in series with its output?
Don Borowski
to FastWave bi...@fastwave.com
Sent by:owner-emc-p...@majordomo.ieee.org
To:'emc-p...@majordomo.ieee.org' emc-p...@majordomo.ieee.org
cc:
Subject:TNV Test Generator
Telecom - Product Safety Question:
I am looking for a test generator per clause 2.3.5 of IEC60950 = a test
generator
...@majordomo.ieee.org' emc-p...@majordomo.ieee.org
Subject: TNV Test Generator
Date: Wed, Dec 11, 2002, 2:55 PM
Telecom - Product Safety Question:
I am looking for a test generator per clause 2.3.5 of IEC60950 = a test
generator is used that provides 120 V +/- 2 VAC at 50 or 60 Hz and has
Telecom - Product Safety Question:
I am looking for a test generator per clause 2.3.5 of IEC60950 = a test
generator is used that provides 120 V +/- 2 VAC at 50 or 60 Hz and has an
internal impedance of 1200 ohms +/- 2%. Anybody have any input on a source
to buy or a method to build such a
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