GROUPINGS
OF ITEMS CAN SOMETIMES QUALIFY FOR A DISCOUNT
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Measurement
Peripherals and specialised hardware is covered by this section. The first
sub section is Thru-line Attenuators DC-18GHz. The products
are mainly those of “Bird” or “Weinschel”. The ranges run from 3dB to 20dB
units. Be sure to choose the correct wattage to cover your application.
Generally, the wattage value should be about 2dBs above the power in watts
of the amplifier one is using. Almost all units are fitted with “N” connectors
(male to female). Some of the larger wattage types exhibit a polarity, so
take care which way around they are connected otherwise damage will occur.
Most of the ranges have a working frequency from DC to 2GHz but there are
dedicated microwave devices working up to 18GHz. A couple of laboratory
hand stepped attenuators have been included in the section.
The second sub section Terminal Loads covers loads all of
which are 50 Ohms working from DC up to 2GHz with a special microwave load
working up to 18GHz (item 656). NOTE: Please do take care when physically
handling the in-line coaxial attenuators & loads. If dropped to the
ground or on any hard surface, typically when attached to cables, the peripheral
etched 50 Ohm termination can crack destroying its frequency & attenuation
characteristics.
A third sub section LF and RF
Filters has been devoted to high pass filters offering a limited
selection which play a role in EMC measurements. These will generally be
used with receiver front ends.
The fourth sub section is Directional Couplers and coaxial switches. A full range of Dual Directional Sampling Couplers can be found working from 10KHz through to 18GHz. They are mostly used in both radiated & conducted Immunity systems. Be aware of the sampling port attenuation & type of connector. An average sampling figure is some 40dB down which means the power sensor must be able to detect this if you are using relatively low powers. Make sure the thru-power handling capability of the coupler is also adequate for the size of amplifier being used. All this information can be found in the main catalogue or on the Web site
Finally, Auxiliary Test & Monitoring Equipment consists
mainly of power meters and camera systems. The camera sytems come as two
types. Item 680, the Fujitsu, is a standard chamber camera powered from
the mains with a coaxial transmission out to a VDU. Item 681 is a more specialized
device used where the invasion of a camera within the field volume is unacceptable.
Essentially item 681 is a standard camera with a 3 metre long fibre lens
which can feed through into the chamber or cell to observe small readouts
on instrumentation etc. whilst itself remaining RF transparent. A fibre
light source accompanies this device. With the Boonton power meters you
will need to use a directional coupler if measuring RF power. Similarly
for the Rohde & Schwarz although one of the R & S systems has a
combined power sensor & coupler (item 685A). Make sure you understand
the reading capability of the power sensor used with your power meter. Some
are thermal devices and will read true rms power with complex waveshapes.
Others are really probes with diode rectifiers and rely on a 50 Ohm target
impedance to give a reliable power reading. One other item within the group
is a “PowerVisa” mains disturbance analyzer. This device simply plugs into
any 13 amp outlet & will record for as long as connected all transients
that occur on the line.
A recent addition to the hire facility is the inclusion of the ETS-i4334
Printed circuit board Scanner. A device for providing
the EMC Engineer with a signal level versus location relative to the component
& track layout on any pcb. An invaluable tool when working on EMC problems
at board level. This can be hired out as a system, which will include as
a minimum, just the Scanner and a laptop preloaded with dedicated ETS
software. If the customer cannot supply their own receiving device then
we offer options to hire the scanner with a receiver or spectrum analyser
from section 100 but at a consolidated price. If you have already have a
receiving device then check with either the Ets web site (More
info: www.etsi.co.uk) or ourselves that there are
drivers written within the existing software. The End user can then connect
up one of five receiver/analysers as listed under item 687 in the main catalogue/Web
site.
A further alternative is to use
the item complete as a working system here at EMC Hire Ltd. The End user
is then charged by the hour. (see section 900, item 929)
For applications requiring remote alignment of clocks in various pieces of test gear we can now supply item 688. This is a mains powered F/O link with a 10MHz bandwidth over a distance of roughly 30 metres. Typically, when the source reference is locked to the receiver then very narrow bandwidths can be achieved enhancing the overall dynamic range of measurement.