Boonton Electronic 4210 Medidor de Nível
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Modelo:
4210
Data:
1985
Categoria:
Grupo:
Descrição:
R.F. MICRO WATTMETER
Informação
The instrument is a microprocessor-controlled, solid- state
unit that features ease of operation, high sensitivity,
lowinput s.w.r., and low noise. It measures r.f. power
levels from 1 nW (-60 dBm) to 100 mW (+20 dBm). The
calibrated frequency range extends from 0.2 MHz to 18 GHz,
depending upon the accessory sensor used; useful response
for relative measurements is obtained from 20 kHz to
approximately 20 GHz. Representative uses of the instrument
include:
a. Low-power transmitter, signal Generator, and Oscillator
measurements
b. S.W.R. and return-loss measurements with directional
couplers and slotted lines
c. Gain and insertion-loss measurements
d. R.F. attenuation and s.w.r. measurements
e. Antenna measurements
1-5. DESCRIPTION OF EQUIPMENT.
1-6. The instrument is packaged as a compact bench unit.
When operated with Boonton Series 4210^/5 sensors, the
instrument displays r.f. power by measuring the voltage
across a precision, non-inductive resistor in the sensor
head with specially selected diodes. Panel indications are
calibrated in terms of power according to the relationship P
= E2/R. This detection system has important performance
advantages over power meters that use bolometer or
thermo-electric detection. The instrument sensitivity of 1
nanowatt (-60 dBm) is orders of magnitude better;
temperature stability of better than 0.001 dB/°C supports
this sensitivity; and burnout levels exceed 300 milliwatts.
1-7. Diode sensors are r.m.s.-responding for low-power
levels (below 20 microwatts for Series 4210^ sensors and 200
microwatts for Series 4210-5 sensors). At these low- power
levels, the instrument measures and displays true
average power for all types of waveforms. Above these
levels, the instrument displays, by means of internal
shaping, the true average power of c.w. signals. If the
r.f..signal is gated or amplitude modulated, the indicated
power may not be the true average power. The signal may be
attenuated to bring it within the r.m.s. region of
measurement. Alternatively, the instrument can be used with
thermal sensors Model 4210-7E/8E; in this case, the
instrument measures and displays the true average power for
all waveforms.
1-8 The outstanding design features are:
a. Wide Frequency Range. The calibrated frequency range of
the instrument is determined by the sensor used with the
instrument. The instrument is normally ordered
with one of the following sensors:
FREQUENCY RANGE“ ^0/-f to
Model
(Impedance)
Power Range
4210-4 A
200 kHz to 7 GHz (50 ohms)
1 nW to 10 mW
4210-4B
200 kHz to 12.4 GHz (50 ohms)
1 nW to 10 raW
4210-4C
200 kHz to I GHz (75 ohms)
1 nW to 10 mW
4210-4E
200 kHz to 18 GHz (50 ohms)
1 nW to 10 mW
4210-5 B
200 kHz to 12.4 GHz (50 ohms)
10 nW to 100 mW
4210-5E
200 kHz to 18 GHz (50 ohms)
10 nW to 100 mW
4210-7E
10 MHz to 18 GHz (50 ohms)
1 /uW to 10 mW
4210-8 E
10 MHz to 18 GHz (50 ohms)
10 ¿¿W to 100 mW
b. Wide Power Range. Depending on the selected sensor, the
instrument will measure r.f. power from 1 nW up to 100 mW.
Temporary overloads up to 300 mW with Series 4210^1 sensors,
and up to 2 W with Series 4210-5 sensors, will do no
permanent harm to the instrument or the sensor. When
measuring pulsed signals, the power indications are accurate
up to 20 microwatts peak power (up to 200 microwatts with
Series 4210-5 sensors). External attenuators may be used to
extend the measurement range of the instrument.
c. Low Noise. The instrument has been designed and
constructed to minimize noise from all sources. The sensor
cable is of a special low-noise design; vigorous flexing
causes only momentary minor excursions of the display on the
most sensitive range of the instrument. The sensors are
insensitive to shock and vibration; even Sharp tapping on
the sensor barrel causes no visible excursions on any range.
Internal signal amplification occurs at approximately 94 Hz,
thereby reducing susceptibility to 50- or 60-Hzfields. A
low-noise solid-state chopper is used.
d. LED Display. Measured power levels are displayed by a
4-digit, LED-type readout with decimal points and minus
sign. Annunciators associated with the LED display indicate
the units of measurement. The result is a clear, unambiguous
readout that minimizes the possibility of misinterpretation.
e. Analog Indications. A front-panel analog meter provides
relative power indications for peaking or nulling
applications. The display is proportional to power on each
range (PWR mode) or to dB over the entire range (dB mode).
f. Pushbutton Measurement-Mode Selection. A choice of
measurement modes is available to the operator. Indications
in terms of power or of dBm can be selected by pressing the
appropriate front-panel key switch. A dB reference level
equal to the last displayed dBm value can be entered through
the keyboard REF switch, and a display mode can be selected
to indicate power levels in dBr relative to that dB
reference level.
g. Automatic Ranging. Autoranging under control of the
microprocessor eliminates the need for manual ranging.
Applications of power levels that exceed the maximum
capability of the instrument result in an error indication
on the LED display.
h. Automatic Zeroing. An automatic zeroing circuit
eliminates the need for tedious, often inaccurate, manual
zeroing. With zero input to the sensor, pressing a front-
panel ZERO key switch directs the microprocessor to compute
and store zero corrections for each range, and the
instrument is thereafter corrected on each range in
accordance with the stored data. This method is considerably
simpler, faster, and more accurate than manual zeroing.
i. Sensor Compensation. Calibration factors in dB are
selected by a front-panel rotary control calibrated in 0.1
dB steps from l.lOto -l.lOdB. The sensor itself is marked
with the appropriate calibration factors as a function of
frequency.
j. Solid-state Chopper. Signal amplification in the
instrument occurs at approximately 94 Hz. Input signals
from the sensor are converted into a 94-Hz signal by a
solid-state, low-level input modulator (chopper), which
represents a distinct improvement over electromechanical
choppers. Extended service life is assured through the
elimination of contact wear, contamination, and other
problems associated with electromechanical choppers.
k. Signature-Analysis Maintenance. Connection facilities to
permit signature-analysis maintenance are incorporated.
Digital circuit troubles can be localized rapidly and
accurately using the signature-analysis maintenance
technique, thereby reducing instrument down-time. An adapter
(P/N 950028) is available from Boonton Electronics
Corporation for signature-analysis maintenance.
Tipo de manual:
Serviço e Manual do Usuário
Páginas:
56
Tamanho:
1,000.13 Kbytes (1024138 Bytes)
Idioma:
english
Revisão:
ID de manual:
98100902
Data:
1985 08 01
Qualidade:
Documento Scaned, a leitura parcialmente mal, não parcialmente legível.
Data de upload:
2017 01 23
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2448c38243a16cb81af89b0d57250447
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