Boonton Electronic 9200A Multímetro digital
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Modelo:
9200A
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Descrição:
RF Millivoltmeter

Informação

The instrument is microprocessor-based with unique features that make it useful for systems requirements as well as for manual operation. The basic instrument can measure RF voltage levels from 200 microvolts to 3 volts over a frequency range from 10 kHz to 1.2 GHz. An optional Model 952005 100:1 Voltage Divider extends the voltage range to 300 V up to 700 MHz. A 50-ohm terminated RF sensor, Model 952009, is also available to measure RF voltage levels from 200 microvolts to 3 volts over a frequency range from 100 kHz to 2.5 GHz. Option 9200A-03 adds a second complete input section that allows the connection of an additional RF Probe for simultaneous measurements of two voltage levels. Measured RF levels can be displayed directly in mV, dBV, dBmV, dB relative to an arbitrary reference, or dBm (dB relative to 1 mW across any impedance between 50 ohms and 600 ohms). Typical uses of the instrument include: a. Measurement of transistor parameters. b. S WR and return loss measurements with directional couplers, reflection coefficient bridges, and slotted lines. c. Gain and loss measurements of wide-band amplifiers. d. Adjustment of tuned circuits in narrow-band amplifiers. e. Adjustment, performance measurements, and parameter evaluation of RF filters. f. Measurement of SWR, return loss, and attenuation of RF attenuators. g. Measurement of output levels of signal generators, adjustment of baluns, harmonic distortion measurements of RF signals, and adjustment of RF circuits for minimum voltage (null) or maximum voltage (peak). 1-5. DESCRIPTION OF EQUIPMENT. 1-6. The instrument is packaged as a compact bench unit with optional adjustable-angle bail. Hardware kits to accommodate either one or two instruments for rack mounting are also available as options. The basic characteristics of the instrument include high reliability, fast warmup, long intervals between calibration, good serviceability, and light weight. Incorporation of a microprocessor, together with a stored-program memory and a non-volatile memory, result in performance features and operating convenience not previously available in a general-purpose RF millivoltmeter. Among the outstanding performance features are: a. Wide Frequency Range. The calibrated frequency range of the instrument is determined by the Probe used with the instrument. The Model 952001 RF Probe supplied with the instrument provides calibrated indications from 10 kHz to 1.2 GHz, with uncalibrated response to beyond 8 GHz. An optional Model 952009 RF Sensor provides calibrated, 50-ohm terminated indications from 100 kHz to 2.5 GHz. NOTE Sensitivity and range linearization data for the Probe supplied with the instrument is stored in non-volatile memory. If another Probe is used with the instrument, data for this Probe must be entered into non-volatile memory before using the Probe. Data entry is a simple procedure, requiring only operation of an internal switch and entry of data through the front-panel keys. No further calibration is necessary. b. Wide Measurement Range. The instrument has eight voltage measurement ranges from 1 mV to 3 volts full scale, arranged in a 1-3-10 sequence. In the dB measurement modes, it covers a range of 80 dB in 8 ranges, with 0.01 dB resolution. The measurement capability of the instrument can be extended to 300 volts at frequencies up to 700 MHz through use of the optional Model 952005 100:1 Voltage Divider. c. True RMS Response. Waveform response of the instrument Probe is true RMS for inputs below 30 mV, allowing accurate voltage measurements with all types of waveforms. Probe waveform response changes gradually as the input voltage is raised above 30 mV approaching peak-to-peak at the higher levels. The instrument shapes the response digitally to indicate RMS voltage, provided that the input is reasonably sinusoidal, as with CW or FM input signals. d. Low Noise. The instrument has been designed and constructed to minimize noise from all sources. The Probe cable is of a special low-noise design; vigorous flexing causes only momentary, minor deflections on the most sensitive range of the instrument. The probes are insensitive to shock and vibration; even Sharp tapping on the Probe barrel causes no visible deflection on any range. Internal signal amplification occurs at approximately 94Hz, thereby reducing susceptibility to 50 or 60 Hz fields. A low-noise solid-state chopper is used. e. Key Selection of Measurement Modes. A choice of measurement modes is available to the operator. Measurements in terms of mV, dBV, dBmV, dB relative to an arbitrarily chosen reference, or dBm (dB relative to 1 mW across any impedance between 50 and 600 ohms) can be selected by merely pressing the appropriate front-panel key. The keyboard also allows entry of dB reference levels and impedance values for these measurement modes. f. Display. Measured values are displayed on a 4-digit, LED type readout with decimal points and minus sign. Annunciators associated with the display indicate the units of measurement. The result is a clear, direct, unambiguous readout that minimizes the possibility of misinterpretation. The display is also used to show data being entered into non-volatile memory and to display data recalled from non-volatile memory. g. Analog Indications. A front-panel meter provides relative RF level indications for peaking or nulling applications. A rear-panel dc output supplies 10 volts full scale that is linear with voltage in the mV mode, or linear in dB over the entire 80 dB range in any of the dB modes. h. Automatic Ranging. Autoranging under control of the microprocessor eliminates the need for manual ranging by the operator. Alternately, a measurement range can be retained for measurements, if desired, by selecting a range hold mode. Application of input levels beyond the measurement capability of the instrument in the autorange mode or outside the selected range in the range hold mode results in an error indication on the display. i. Automatic Zeroing. An automatic zeroing circuit eliminates the need for tedious, often inaccurate manual zeroing. With zero input to the Probe, pressing the front- panel ZERO key causes the microprocessor to compute and store zero corrections for each range, which are applied to subsequent readings. A logic transition is available at a rear-panel connector for automatic turn-off of a source during the automatic zeroing sequence. j. Stored Probe Data. Sensitivity and range linearization data for two probes may be stored in the instrument non-volatile memory. Probe data is written into memory at the factory for probes ordered with the instrument; Probe data may also be written into memory quickly and easily in the field. A hard copy of stored data is provided under the right side cover of the instrument. The microprocessor corrects measurements automatically in accordance with the stored Probe data. k. High/Low dB Limits. High and low dB limits can be entered through the instrument keyboard. A panel annunciator indicates when either limit has been exceeded, whether the instrument is operating in the mV or any dB mode. Rear-panel TTL outputs also provide remote indications of out-of-limit conditions. 1. Solid-state Chopper. Signal amplification in the instrument occurs at approximately 94 Hz. Input signals from the Probe are converted into 94 Hz signals 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. m. Maintenance. The instrument is designed for easy maintenance. Accessibility to all printed circuit boards is excellent, all interconnecting cables are Plug-In, and all active devices are socket-mounted. Connection facilities for signature analysis are incorporated, and special diagnostic ROMs are available. Digital circuit troubles can be localized rapidly and accurately using the signature- analysis maintenance technique, thereby reducing instrument downtime.

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Serviço e Manual do Usuário
Tipo de manual:
Serviço e Manual do Usuário
Páginas:
96
Tamanho:
9.41 Mbytes (9868404 Bytes)
Idioma:
english
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Documento Scaned, a leitura parcialmente mal, não parcialmente legível.
Data de upload:
22 Janeiro 2017
MD5:
9a4ab7ca9256dafa3b51e09e526dcb47
Downloads:
463

Informação

1-1 Scope of Manual ... 1-1 1-3 Purpose of Equipment ... 1-1 1-5 Description of Equipment ... 1-1 1-7 Accessories ... 1-2 1-10 Options ... 1-5 1-14 Specifications ... 1-5 1-16 Outline Dimensions ... 1-5 SECTION II - OPERATION Paragraph Page 2-1 General ... 2-1 2-3 Installation ... 2-1 2-4 Unpacking ... 2-1 2-5 Mounting ... 2-1 2-6 Power Requirements ... 2-1 2-7 Cable Connections ... 2-1 2-8 Operating Controls, Indicators, and Connectors ... 2-1 2-10 Power Application ... 2-1 2-12 Preliminary Check of Instrument ... 2-3 2-14 Operating Procedures ... 2-6 2-15 Programming Measurement Parameters ... 2-6 2-16 Zeroing the Instrument ... 2-8 2-17 Making Measurements ... 2-9 2-18 Application Notes ... 2-9 2-19 Overload Limits ... 2-9 2-20 Connection Recommendations ... 2-9 2-21 Low-Level Measurements ... 2-9 2-22 Temperature Effects ... 2-9 2-23 Hum, Noise, and Spurious Pickup ... 2-9 2-24 Recorder Output ... 2-9 2-25 Correction Curve for Model 952003 50 Ohm N Tee Adapter ... 2-9 2-26 Correction Curve for Model 952007 75 Ohm N Tee Adapter ... 2-9 2-27 Minimum Performance Standards ... 2-10 2-28 Test Equipment Required ... 2-10 2-29 Preliminary Setup ... 2-10 2-30 Automatic Zero Function Test ... 2-11 2-31 Autoranging Mode Test ... * ... 2-11 2-32 Range Hold Function Test ... 2-11 2-33 Basic Instrument Accuracy Test ... 2-11 2-34 dB Mode Check ... 2-12 2-35 dB Reference Level Function Test ... 2-12 2-36 dB Limit Test ... 2-12 SECTION III — THEORY OF OPERATION Paragraph Page 3-1 General ... 3-1 3-4 Overall Block Diagram ... 3-1 3-5 Probe ... 3-1 3-6 Input Module ... 3-1 Paragraph Page 3-7 Control Module ... 3-1 3-8 Display Module ... 3-1 3-9 Power supply Module ... 3-1 3-10 Optional Modules ... 3-1 3-11 Detailed Theory of Operation, Probe Circuits ... 3-2 3-15 Detailed Theory of Operation, Input P.C. Board Circuits ... 3-3 3-25 Detailed Theory of Operation, Control P.C. Board Circuits ... 3-4 3-33 Detailed Theory of Operation, Display P.C. Board Circuits ... 3-9 3-40 Detailed Theory of Operation, Power supply Circuits ... 3-10 SECTION IV - MAINTENANCE Paragraph Page 4-1 General ... 4-1 4-3 Test Equipment Required ... 4-1 4*5 Troubleshooting Concept ... 4-1 4-7 Signature Analysis ... 4-1 4-13 Trouble Localization ... 4-2 4-14 Gaining Access to Internal Components ... 4-2 4-15 Visual Inspection ... 4-2 4-16 Use of Block Diagrams ... 4-2 4-17 Systematic Troubleshooting ... 4-2 4-18 Signature Analysis Free-Running Test Procedures ... 4-5 4-20 Signature Analysis Programmed Test Procedures ... 4-10 4-22 Non-Volatile RAM Circuit Tests ... 4-17 4-23 Non-Volatile RAM Test ... 4-17 4-24 Non-Volatile RAM Battery Test ... 4-17 4-25 Non-Volatile RAM Battery Replacement ... 4-18 4-26 Non-Volatile Memory Data ... 4-18 4-27 General ... 4-18 4-28 Instrument Gain Data ... 4-18 4-29 Probe Data ... 4-19 4-30 Instrument Operation-Related Data ... 4-19 4-31 Recall and Entry of Instrument Gain Data ... 4-19 4-33 Recall and Entry of Probe Data ... 4-20 4-35 Instrument Adjustment and Calibration ... 4-21 4-36 General ... 4-21 4-37 Power supply Adjustments ... 4-21 4-38 Input Module Calibration and Adjustments ... 4-21 4-39 DC Calibration ... 4-22 4-40 AC Calibration ... 4-22 4-41 DC Recorder Calibration ... 4-24 4-42 Probe SWR and Frequency Response Tests ... 4-24 4-43 General ... 4-24 4-44 SWR Test ... 4-25 4-45 Frequency Response Tests ... 4-25 4-46 Alternate Frequency Response and SWR Test Procedure ... 4-26 SECTION V - PARTS LIST Paragraph Page Table of Replaceable Parts ... 5-1 Schematic Diagrams ... 6-1 APPENDIX A - IEEE-488 BUS Interface OPTION 9200A-01A Paragraph Page A-l Description ... A-l A-4 Capability ... A-l A-6 Installation ... A-l A-8 Operation ... A-l A-9 Address Assignment ... A-2 A-10 Message Terminator ... A-2 A-l 1 Command Response ... A-2 A-l2 Operating States ... A-2 A-l3 Remote Programming ... A-3 A-14 Bus Programming Syntax ... A-3 A-19 Store/ Recall Functions Syntax ... A-4 A-21 Output Data Format ... A-4 A-22 Hold Measurement Function Syntax ... A-5 A-23 SRQ Function Syntax ... A-5 A-24 Measurement Trigger Syntax ... A-5 A-25 Typical Application ... A-5 A-27 Use of Hold Measurement, Pull SRQ and Trigger Commands ... A-6 A-28 Theory of Operation ... A-6 A-29 General ... A-6 A-30 Detailed Description (see Figure A-l) ... A-6 A-35 Maintenance ... A-8 A-36 General ... A-8 A-37 Physical Inspection ... A-8 A-38 Voltage Checks ... A-8 A-39 Active-Device Substitution ... A-8 A-40 Signature Analysis ... A-8 A-41 Other Analyses ... A-8 APPENDIX B - INPUT CHANNEL 2 OPTION 9200A-03 Paragraph Page B-l Description ... B-l B-3 Installation ... B-I B-5 Operation ... B-l B-9 Maintenance ... B-2 APPENDIX C - REAR INPUT OPTION 9200A-04 Paragraph Page C-l Description ... C-l C-3 Operation ... C-l

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