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Boonton Electronic - 4220 - Level Meter
Manufacturer:
Equipment:
4220
Date:
1993
Category:
Group:
Sub Group:

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.

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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
MD5:
482941e9-fccd-2fc4-d345-bea140a509e0
Downloads:
593