GROUPINGS
OF ITEMS CAN SOMETIMES QUALIFY FOR A DISCOUNT
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In the sub section
Hire of 5305 G-TEM
Cell (on Customer’s Site)
there is much to consider and inform us about. Basically, we will be loading
the 5305 GTEM into a tail-lift van. Two of our staff will travel to the
customer’s premises to facilitate unloading but we will still require the
help of one or two personel from the company hiring to oversee the safe
installation of the GTEM into its intended place of operation. With the
GTEM you will have already decided on the type of tests you wish to perform,
i.e. emissions, immunity or both and that will entail including the actual
test equipment to carry out these two tasks. Concerning the immunity, the
many pieces of equipment supplied will include an RF amplifier sufficient
to provide at least 15v/m modulated within the cell. If you require larger
fields or any other peculiarity then inform us for a specified quotation.
On the emission task there is the choice of either a receiver or spectrum
analyzer. If you intend to supply some items of test gear yourself there
may be a problem of driver compatibility with our software. Within the model
5305 GTEM, the EUT size should not exceed approx 160mm cubed. Access to
the EUT for power & other I/O lines is facilitated via an access panel
mounted on the base floor of the GTEM with a waveguide beyond cut-off
having a 29mm internal diameter plus a 25 way “D” filtered connector.
The hire manager will want to know as much as possible about your situation
to help prepare the GTEM plus ancillary equipment prior to delivery. For
example, if the EUT needs observing during an immunity test then a special
fibrescope camera & light source can be found under item
681.
When
visiting us to use the Hire of Model 5311 G-TEM (in-house) the same type of information about your EUT is needed as just discussed
on the model 5305. We typically need to know the size, how it is powered
up and how many I/O connections there are to peripheral pieces of equipment.
We have camera facilities within the cell to facilitate viewing the EUT
or its readout panel.
Sub section Field Monitoring
Stations (Item 940-942) provides for magnetic or electric
field monitoring units under PC logging operation. Item 940 is based on
our broadband (or filtered) magnetic field meter. Items 941 & 942 can
be based on either a broadband electric field meter or a combination of
spectrum analyser/receiver and antennae.
Essentially, apparatus for item 940 is contained within a portable case
with a mains wander lead to power up the system. Once initiated on the PC,
the device can remain monitoring & unattended for twenty four hours
or up to a week. Our
emissions surveillance and broadband packages are written such that the
user could log the peak
(Broadband Package) of a spot frequency
or a range of frequencies for
a period with pre-determined measurement intervals or peaks (Emissions
Surveillance Package) of a range
of frequencies for a fixed or variable period.
Finally, Conducted Immunity Groups (Items 950-954 & 956/7) provide the hirer
with a suite of equipment to perform the various types of conducted immunity
right down to the cables. This can be particularly helpful if the end user
is not too familiar with the test.
Conducted immunity is used to inject an interfering
signal onto the supply/mains lines or the control & signal lines of
equipment and determine whether there are any susceptibilities and, if present,
their severity.
Normally, there are three main methods of
coupling this signal. These are: 1: Coupling/Decoupling Network, 2: Bulk
Current Injection Probe (150Ω using 2off 50Ω
-150Ω BCI Cal. Adaptors
or the 50Ω Standard) and 3: EM Clamp. The CDN capacitively couples the interfering signal, the Current Injection
Probe inductively couples the
signal and the EM-Clamp uses both inductive
and capacitive coupling. Before testing, the level is set by performing an Initial Jig Calibration and then, when testing,
an emissions probe could be used to monitor the level of induced signal current. If used, the results
are dealt with it in a number of ways. Ie. To, either: 1: Limit the line
current, 2: Record the line current or 3: Level the line current.
Currently, we have three main test applications covered by our conducted
immunity software. These are: Commercial (Items 950-954), based upon IEC61000-4-6,
Military (Item 956), based upon DEF STAN 59/41 and Automotive (Item 957),
based upon ISO11452 and we are developing another system (Item 958) based
upon DO160-D Commercial Aircraft specification. Again, we are available
to help you in the choice of system.
When enquiring, the customer should state what test
they have to comply with, if known, as well as frequency ranges and levels.
Accompanying each
group, is a CI kit containing a high power attenuator, 50W load, dual directional coupler,
where necessary, a set of 50W-100W BCI thru’ loads (150Ω
BCI method), and various leads. If
the customer requires, a) an additional Amplifier; these are found under
section 400, b) an additional CDN or Current
Probe; these are found under section
500 and 200, respectively, c) a different high power or signal attenuator;
these are found under section 600
and d) a hinged ground plane measuring 0.62m x 1.21m; this is listed under
section 800, item 814.