Boonton Electronic 4220 Miernik poziomu
Producent:
Model:
4220
Data:
1993
Kategoria:
Grupa:
Opis:
RF Powermeter

Informacja

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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Serwis i User Manual
Typ ręczny:
Serwis i User Manual
Strony:
89
Rozmiar:
4.39 Mbytes (4598900 Bytes)
Język:
english
Rewizja:
Ręczny ID:
98101600C
Data:
1993 07 01
Jakość:
Skanowany dokument, wszystko czytelne.
Data przesłania:
2017 01 22
MD5:
482941e9fccd2fc4d345bea140a509e0
Pobrane:
808

Informacja

SECTION I — GENERAL INFORMATION Paragraph Page 1-1 Introduction 1-1 1-3 Description ... 1-1 1-5 Features ... 1-1 1 -6 Power S ensors 1-1 1-10 Simple Instrument Setup and Operation ... 1-1 1-11 Alphanumeric Displays 1-1 1-12 Selectable Ranging ... 1-1 1-13 Selectable Filtering 1-2 1-14 Zeroing ... 1-2 1-15 Built-In Precision Calibration 1-2 1-16 Analog Display ... 1-2 1-17 Chart Recorder Output ... 1-2 1-18 GPIB (Optional) ... 1-2 1-19 Accessories 1-2 1-21 Options ... 1-2 1-22 Option-Ol, IEEE Bus Interface ... 1-2 1-23 0ption-02, Rear Panel Calibrator Connector ... 1-2 1-24 Specifications ... 1-2 SECTION n — INSTALLATION Paragraph Page 2-1 Introduction ... 2-1 2-3 Unpacking ... 2-1 2-5 Mounting ... 2-1 2-7 Power Requirements ... 2-1 2-9 Connections ... 2-2 2-10 Sensor 2-2 2-11 Recorder 2-2 2-12 GPIB ... 2-2 2-13 Preliminary Check ... 2-2 SECTION HI — OPERATION Paragraph Page 3-1 Introduction ... 3-1 3-3 Operating Controls, Indicators and Connectors 3-1 3-5 Operating the Instrument ... 3-1 3-7 Sensor Connection 3-4 3-9 Measurement Parameter Selection 3-4 3-10 Sensor Selection ... 3-4 3-11 Range Selection 3-4 3-12 Frequency Selection 3-4 3-13 Filter Selection 3-4 3-14 Reference Level Selection 3-4 3-15 dB Calibration Factor Entry . 3 - 5 3-16 Bus Address Selection (IEEE-488 Option Only) ... 3-5 3-17 Zeroing the Instrument ... 3-5 3-19 Calibrating the Instrument 3-5 3-21 Making a Measurement ... 3-6 3-23 GPIB Operation 3-6 3-25 Intializing the Instrument 3-6 SECTION IV — APPLICATION NOTES Paragraph Page 4-1 Introduction ... 4-1 4-3 Sensor Calibration ... 4-1 4-4 General ... 4-1 4-5 14-Point Linearity Data ... 4-1 4-7 High Frequency Calibration Points ... 4-1 4-9 Zeroing ... 4-1 4-16 Dynamic Range ... 4-4 4-18 Filtering ... 4-4 4-22 Noise ... 4-5 4-23 Noise Reduction ... 4-5 4-25 Error Computation ... 4-5 4-27 Noise Error Examples ... 4-5 4-28 Integration of Power ... 4-5 4-29 Clearing of Filter ... 4-5 4-30 Partial Results ... 4-5 4-31 Measurement Time ... 4-10 4-32 Step Response, ... 4-10 4-33 Continuous Response ... 4-10 4-34 Overhead Time ... 4-10 4-36 Digital Filter ... 4-10 4-37 Default Filter Lengths ... 4-10 4-38 Settled Measurement Time ... 4-10 4-39 High Frequency Accuracy ... 4-10 4-42 Waveform Sensitivity ... 4-12 4-47 Chart Recorder Operation ... 4-12 4-49 Analog Meter Operation ... 4-13 4-51 Watts Mode ... 4-13 4-52 dBm Mode ... 4-13 4-53 dBr Mode ... 4-13 4-54 Remote (GPIB) Operation ... 4-13 4-55 Introduction ... 4-13 4-57 Local Operation ... 4-13 4-58 Remote Operation ... 4-13 4-59 Bus Address ... 4-13 4-60 Terminating Characters ... 4-13 4-61 Listen Operation ... 4-13 4-62 T alk Operation ... 4-13 4-64 IEEE-488 Command Supported ... 4-14 4-65 Number Formatting ... 4-14 4-66 String Format ... 4-14 4-67 Listen Parameter Commands ... 4-15 4-69 Listen Action Commands ... 4-15 4-7 0 Listen Array Commands ... 4-15 4-72 Talk Modes ... 4-16 4-76 Talk Mode 0 (Talk Measurement Floating Point) ... 4-16 4-77 Talk Mode 1 (Talk Measurement With Units) ... 4-17 4-78 Talk Mode 2 (Talk Error) ... 4-18 4-79 Talk Mode 3 (Talk Error with Message) ... 4-18 4-80 Talk Mode 4 (Talk Channel Status) ... 4-18 4-81 Talk Mode 5 (Talk Instrument Status) ... 4-18 4-82 Talk Mode 6 (Talk Parameter) ... 4-18 4-85 Talk Mode 7 (Talk Array) ... 4-19 4-86 IEEE-488 Bus Only Commands ... 4-19 4-87 General ... 4-19 4-88 Talk Mode (TM) Command 4-19 4-89 SI Command 4-19 4-93 SO Command 4-19 4-97 FI Command 4-20 4-101 FO Command 4-20 4-106 DI Command 4-20 4-109 DO Command ... 4-21 4-112 DF Command ... 4-21 4-113 DN Command ... 4-21 4-114 SM (SRQ Mask) ... 4-21 4-115 Measured and Triggered Operation And Settled Reading ... 4-21 4-116 General 4-21 4-117 Measure Normal (MN) ... 4-22 4-118 Measure Filtered (MF) ... 4-22 4-119 Measure Settled (MS) 4-22 4-120 Trigger Normal (TN) 4-22 4-121 Trigger Filtered (TF) ... 4-22 4-122 Trigger Settled (TS) ... 4-22 4-123 IEEE Programming Examples.. 4-22 4-126 Example 1 4-22 4-127 Example 2 ... 4-23 4-128 Error Messages ... 4-23 SECTION V — THEORY OF OPERATION Paragraph Page 5-1 Introduction ... 5-1 5-3 Basic Block Diagram ... 5-1 5-10 Power Sensors ... 5-2 5-11 Diode Sensors ... 5-2 5-12 Thermal Sensors ... 5-2 5-13 Input Circuits 5-2 5-14 Chopper Circuits ... 5-2 5-15 Amplifier Circuits ... 5-4 5-16 Filter and A/D Conversion Circuits ... 5-18 D/A Conversion Circuits ... 5-4 5-19 Chopper Drive Circuits 5-5 5-21 Other Input Assembly Circuits 5-5 5-22 Control Assembly ... 5-5 5-23 Genera] 5-5 5-24 Microprocessor Circuits 5-5 5-28 Display/Keyboard Interface Circuits ... 5-5 5-31 RANGE and FUNCTION Switches 5-7 5-32 Power supply Circuits ... 5-7 5-34 Display/Keyboard Assembly ... 5-7 5-35 General 5-7 5-36 Display Circuits ... 5-7 5-37 Annunciators, Keys, and Analog Meter 5-7 5-38 Calibrator Assembly 5-7 5-40 GPIB Assembly (Optional) ... 5-7 SECTION VI — MAINTENANCE Paragraph Page 6-1 Introduction ... 6-1 6-3 Safety Requirements 6-1 6-5 Test Equipment Required ... 6-1 6-7 Cleaning Procedure 6-1 6-9 Removal And Replacement ... 6-1 6-10 Instrument Covers ... 6-1 6-11 Display/Keyboard Access ... 6-2 6-12 Other Assemblies ... ! ... 6-2 6-13 Inspection ... 6-2 6-15 Performance Tests ... 6-4 6-17 Troubleshooting ... 6-5 6-18 General ... 6-5 6-22 Troubleshooting Chart ... 6-5 6-23 Fault Isolation Procedures ... 6-5 6-24 Power supply Checks ... 6-5 6-25 Microprocessor Checks ... 6-5 6-26 Chopper Circuit Checks ... 6-7 6-27 Input Assembly Checks ... 6-7 6-28 50 MHz Calibrator Checks ... 6-8 6-29 Adj ustment ... 6-8 6-31 Calibration ... 6-9 6-32 General ... 6-9 6-33 Preliminary Steps ... 6-9 6-34 Manual Calibration ... 6-9 SECTION VH — PARTS LIST

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