Any signal generator capable of testing the in-band performance of an AM
radio should be good enough to perform both 61000-4-3 and 61000-4-6, unless
you are testing the performance of a radio during 61000-4-3 and 61000-4-6.
In this case, you may need to make sure that the amount of noise getting
into the radio passband from the field at a near by frequency is kept low.
Even in this case, you could modify the field frequency points so that they
fell at -0.5% and +0.5% of the radio's center frequency. With this much
offset, the phase noise issue would be minimized.
I would strongly suggest getting a directional coupler for at least the
61000-4-3 test. The test speaks about forward power when doing field
calibration, and adjustments made to the forward power to bring the field
into calibration, though this is usually done by adjusting the output level
of the signal generator and assuming that the power amplifier is linear.
However, if you want to check to make sure that the adjustments are giving
the proper results, you will need something to check power (power meter,
calibrated receiver, or spectrum analyzer). You will also probably need to
reduce the power sent to the antenna down to the power measurement range of
the power meter/calibrated receiver/spectrum analyzer. A directional
coupler can do this for you. Having said all that, the ultimate check is
the field strength, which is measured by a field probe (that you must
have).
I have a directional coupler in my test system at the output of the power
amplifier. I monitor the forward power during the 61000-4-3 test, checking
it against the values obtained during the field calibration. This gives me
a continuous reading of the system health during the test.
For the 61000-4-6 test, you will need a power meter (or calibrated receiver
or spectrum analyzer) to calibrate the CDNs if you do your own calibration.
BTW, I place a field probe at the EUT side of each CDN during the 61000-4-6
test as a check to make sure I am indeed conducting a test signal out of
the CDN.
My advice: Unless you have a special need, get a less expensive signal
generator and use the money left over to get a power meter and directional
coupler.
Don Borowski
Schweitzer Engineering Labs
Pullman, WA
"Grace Lin"
<gracelinnj@gmail
.com> To
Sent by: [email protected]
[email protected] cc
Subject
04/27/2006 06:55 Phase Noise per 61000-4-3 and
AM 61000-4-6 and More
Dear Experts,
We are in the process of building a new engineering building with a 3m
chamber (for emission and immunicty measurement). We are looking for A2LA
accreditation after the chamber is built. A lot of test equipment need to
be purchased. And a lot of questions arise.
What is phase noise requirement for a signal generator to perform 61000-4-3
and 61000-4-6 tests? Since I used a Gigatronics 6082A signal generator
before, I use its specifications to look for one. An agent returned to me
with a $32k quote and told me if I can lower phase noise requirement, he
can find a much cheaper model.
An used equipment is not an option as the owner of the company will not
approve any used equipment.
Personally, I prefer to have a signal generator in a chamber control room
to perform 61000-4-3 test and a signal generator outside of chamber area to
perform 61000-4-6 test. I am not sure if I can achieve this as I do have a
budget limit.
Another question: do I need to purchase a directional coupler and a power
meter for these two tests? For 61000-4-3 test, since I have a field probe
and a field monitor, I think I am OK. For 61000-4-6, this is questionable.
Your help is highly appreciated!
Best regards,
Grace Lin
I need your help to find inex
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