Atten AT5010 Kullanım Talimatları Kılavuzu - Sayfa 12
Ölçüm Cihazları Atten AT5010 için çevrimiçi göz atın veya pdf Kullanım Talimatları Kılavuzu indirin. Atten AT5010 20 sayfaları. Spectrum analyzers
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Operating conditions
The instrument has been designed for indoor use.
The permissible ambient temperature range during
operation is + 10 (+50 F)
+40
(+104 F).
It may occasionally be subjected to temperatures
between +10
(+50 F) and -10
(+14 F)
without degrading its safety. The permissible am
bient temperature range for storage or transportation
is -40
(-40 F)
+70
(+158 F). The
maximum operating altitude is up to 2200m
(non-operating 1500m). The maximum relative
humidity is up to 80%.
If condensed water exists in the instrument it should
be acclimatized before switching on. In some cases
(e.g. extremely cold spectrum analyzer) two hours
should be allowed before the instrument is put into
operation. The instrument should be kept in a clean
and dry room and must not be operated in explosive,
dusty, or moist environments. The spectrum
analyzer can be operated in any position, but the
convection cooling must not be impaired. For
continuous operation the instrument should be used
in the horizontal position, preferably tilted upwards,
resting the tilt handle.
The specifications stating tolerances are only
valid if the instrument has warmed up for 60
minutes at ambient temperature between +
15
(+59 F) and +30
(+86 F). Values
without tolerances are typical for an average
instrument.
Warranty
ATTEN warrants to its Customers that the products
it manufactures and sells will be free from defects in
materials and workmanship for a period of 1 years.
This warranty shall not apply to any defect, failure
or damage caused by improper use or inadequate
maintenance and care. ATTEN shall not be obliged
to provide service under this warranty to repair
damage resulting from attempts by personnel other
than ATTEN representatives to install, repair,
service or modify these products.
In order to obtain service under this warranty,
Customers must contact and notify the distributor
who has sold the product.
Each instrument is subjected to a quality test with
10 hour burn-in before leaving the production.
Practically all early failures are detected by this
method. In the case of shipments by post, rail or
carrier it is recommended that the original packing
is carefully preserved. Transport damages and
damage due to gross negligence are not cover by the
warranty.
In the case of a complaint, a label should be
attached to the housing of the instrument which
describes briefly the faults observed. If at the same
time the name and telephone number (dialing code
and telephone or direct number or department
designation) is stated for possible queries, this helps
towards speeding up the processing of warranty
claims.
Maintenance
Various important properties of the Spectrum
Analyzer should be carefully checked at certain
intervals. Only in this it largely certain that all
signals are displayed with the accuracy on which the
technical data are based.
The exterior of the instrument should be cleaned
regularly with a dusting brush. Dirt which is
difficult to remove on the casing and handle, the
plastic and aluminum parts, can be removed with a
moistened cloth (99% water +1% mild detergent).
Spirit or washing benzine (petroleum ether) can be
used to remove greasy dirt. The screen may be
cleaned with water or washing benzene
[but not with spirit (alcohol) or solvents], it must
then be wiped with a dry clean lint-free cloth. Under
no circumstances may the cleaning fluid get into the
instrument. The use of other cleaning agents can
attack the plastic and paint surfaces.
Switching over the mains/line voltage
The spectrum analyzer operates on mains/line
voltages of 115V AC and 230V AC. The voltage
selection switch is located on the rear of the
instrument and displays the selected voltage can
be selected using a small screwdriver. Remove the
power cable from the power connector prior to
making any changes to the voltage setting. The
fuses must also be replaced with the appropriate
value (see table below) prior to connecting the
power cable. Both fuses are externally accessible by
removing the fuse cover located above the 3-pole
power connector.
The fuseholder can be released by pressing its
plastic retainers with the aid of a small screwdriver.
The retainers are located on the right and left side of
the holder and must be pressed towards the center.
The fuse(s) can then be replaced and pressed in until
locked on both sides.
Use of patched fuses or short-circuiting of the
fuseholder is not permissible; ATTEN assumes no
liability whatsoever for any damage caused as a
result, and all warranty claims become null and void.
Fuse type
Size 5 20mm,
250-Volt AC,
Must meet IEC
specification 127,
Sheet lll (or DIN 41 662
or DIN 41 571, sheet 3)
Time characteristic: time-lag
Line voltage: 115V~
10% Fuse rating: T315mA
Line voltage: 230V~
10% Fuse rating: T160mA
Introduction
The spectrum analyzer permits the detection of
spectrum components of electrical signals in the
frequency range of 0.15 to 1050MHz. The detected
signal and its content have to be repetitive. In
contrast to an oscilloscope operated in Yt mode,
where the amplitude is displayed on the time
domain, the spectrum analyzer displays amplitude
on the frequency domain (Yf). The individual
spectrum components of "a signal" become
visible on a spectrum analyzer. The oscilloscope
would display the same signal as one resulting
waveform.
The spectrum analyzer works according to the triple
superhet receiver principle. The signal to be
measured (fin = 0.15MHz to 1050MHz) is applied
to the 1st mixer it is mixed with the signal of a
variable voltage controlled oscillator (fL0 1350MHz
2350MHz).This oscillator is called the 1st LO (local
oscillator). The difference between the oscillator
and the input frequency (fL0 fin = 1st IF) is the first
intermediate frequency, which passes through a
waveband filter tuned to a center frequency of
1350MHz. It then enters an amplifier, and this is
followed by two additional mixing stages,
oscillators and amplifiers. The second IF is 29.
875MHz and the third is 2.75MHz. in the third IF
stage, the signal can be selectively transferred
through a filter with 400KHz or 20KHz bandwidth
before arriving at an AM demodulator. The
logarithmic output (video signal) is transferred
directly, or via a low pass filter to another amplifier.
This amplifier output is connected to the Y
deflection plates of the CRT.
The X deflection is performed with a ramp
generator voltage. This voltage can also be superim-
posed on a dc voltage which allows for the control
of 1st LO. The spectrum analyzer scans a frequency
range depending on the ramp height. This span is
determined by the scanwidth ser-ting In ZERO
SCAN mode only the direct voltage controls the 1st
LO.
The AT 5011 also includes a tracking generator. This
generator provides sine wave voltages within the
frequency range of 0.15 to 1050MHz. The tracking
generator is determined by the first oscillator
(1st LO) of the spectrum analyzer section. Spectrum