Boonton Electronic 4210 Medidor de Nível
Fabricante:
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.

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Serviço e Manual do Usuário
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
MD5:
2448c38243a16cb81af89b0d57250447
Downloads:
516