Boonton Electronic - 4220 - Level Meter
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Equipment:
4220
Date:
1993
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Information
The Model 4220 is a microprocessor-based, single channel,
solid state RF powermeter. It is capable of measuring RF
power levels from -70 dBm to +44 dBm. The frequency range
and power level are sensor dependent. Available Boonton
50000 series sensors provide measurement capabilities for
frequencies from 100 kHz to 100 GHz.
1-5. FEATURES.
1-6. Power Sensors. A wide range of diode and thermocouple
power sensors for both coaxial and waveguide applications is
available for use with the Model 4220. Power sensors are not
supplied as part of the Model 4220, but must be ordered
separately.
1-7. Diode sensors measure the voltage across a precision
resistor, using specially selected diodes. Detection is
square law (true RMS) over approximately the lower
two-thirds of the sensor dynamic range, and peak detecting
over the upper portion. Because the instrument is calibrated
for sine waves over the entire range, measurements at the
top one-third of the sensor dynamic range are valid only for
non-modulated signals. In the RMS region, linearity is
excellent, and any signal type can be measured. The diode
range has been extended into the peak detecting region with
the use of real time shaping for the diode curve. When
coupled with the high sensitivity of the diode, such shaping
allows an unprecedented dynamic range of 80 dB or more.
Diode sensors are rugged and have an overload headroom of
more than 5 dB for continuous signals. The dynamic range in
the RMS region can be extended further through use of an
external attenuator.
1-8. Thermal sensors measure the voltage developed across a
dissimilar metal junction caused by the thermal gradient
generated by the RF power being measured. Because these
sensors are heat detecting, they provide true RMS response
over their entire range. Very high peak power (15 to 30
watts) can be accommodated for very short duty cycles and
still provide valid results. The dynamic range is 50 dB.
Thermal sensors are not as sensitive as diode sensors.
1-9. Calibration data for up to four sensors can be stored
in non-volatile EEPROM. Linearity and high frequency sensor
calibration correction data, which are supplied with each
sensor, can be entered. For sensors ordered with the Model
4220, the calibration data is entered prior to shipment.
When the frequency of the RF signal to be measured by one of
these sensors is entered, the instrument looks up the
appropriate high frequency calibration factors (cal
factors), interpolates as necessary, and applies the
correction to the measured value automatically. Sensors for
which cal factors are not stored in EEPROM can also be used
with the instrument. Cal factors for such sensors can be
read off the calibration sheet supplied with the sensor and
entered manually through the front panel controls. Cal
factors entered in this manner will be used by the
instrument to correct subsequent readings, but will not be
stored in non-volatile EEPROM, Cal factors for sensors
ordered with the instrument are stored in a plastic pouch
attached to the inside top cover.
1-10, Simple Instrument Setup and Operation. In the
operating mode the functions ZERO, WATTS, dBm, dBr, LOAD
REF, and PWR REF are selected with a single keystroke. In
the shifted mode, GPIB address, filter, frequency, range,
set reference, and sensor calibration setup parameters may
be accessed. Values for these parameters are displayed and
can be adjusted simply by using up/down keys.
1-11. Alphanumeric Displays. Two alphanumeric LED displays
provide clear, unambiguous readouts of instrument setup and
measurement values. In the shifted mode, selected setup
functions are shown on one of the displays and the numerical
value for that function is shown on the other. In the
operating mode, the measured value is shown on one of the
displays, and the dB calibration factor applied to the
measurement is shown on the other. Annunciators associated
with the main data display indicate the unit applicable to
the displayed measurement value, thereby minimizing the
possibility of reading misinterpretation.
1-12. Selectable Ranging. Any of seven measurement ranges,
or autoranging, can be selected during instrument setup. The
selection will be held until it is changed, or until the
instrument is off. When measuring signals with levels that
fall within a narrow range, selecting one specific
instrument range may reduce measurement time. Autoranging is
useful if the RF signal level is unknown, or if RF signals
with widely varying levels are to be measured.
1 Manual
Service and user manual
Manual type:
Service and user manual
Pages:
89
Size:
4.4 MB
Language:
english
Revision:
Manual-ID:
98101600C
Date:
July 1993
Quality:
Scanned document, all readable.
Upload date:
Jan. 22, 2017
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