Equipment information

Boonton Electronic 92B Level Meter
Manufacturer:
Model:
92B
Date:
1980
Category:
Group:
Description:
Millivoltmeter

Information

The Model 92 Series RF Millivoltmeter provides an accurate readout of measurements from the low radio frequencies to the gigahertz region, over a voltage range of 200 uV to 3 volts. It is a programmable, solid-state instrument of high sensitivity and accuracy, characterized by high input impedance (see Figures 1 and 2), excellent stability, and low noise. The Model 92 exhibits true rms response for input signals up to 30 millivolts, gradually approaching peak-to-peak above this level. The meter, however, is calibrated to indicate rms of a sine wave above 30 mV. Input and output connections for external control and readout are provided by a 22-pin card-edqe connector at the rear of the instrument. ■ A linear dc output, whose level is proportional to the rf input voltage, is also provided at a rear connector. This may be used to drive a recorder, remote indicator, or other analog devices. The 92 offers a convenient and accurate means for making a wide variety of measurements. Typical uses of this instrument include: In transistor testing the instrument may be used to measure 6, f , and other transistor parameter s. SWR and return loss measurement using the Model 92 Series with bridge methods, directional couplers, and adjustable or slotted lines. Gain and loss measurements in wide-band amplifiers, including such design characteristics as stage gain, flatness of the pass band, upper cut-off or corner frequency, negative feedback factors, and other parameters. Proper adjustment of tuned circuits in narrow-band amplifiers. The adjustment, measurement of performance, and evaluation of rf Filter parameters. Measurement of vswr or return loss and attenuation of rf attenuators. Measurement of output levels of signal generators, adjustment of baluns, harmonic distortion of rf signals, and adjustment of circuits for minimum voltage (null) or maximum voltage (peak). The Model 92 is available in several optional configurations with a basic accuracy of 1% rdq. + 1% fs. The standard features of the instrument are; Remote programmability. Measures from 200 yV to 3V* from 10 kHz to 1.2 GHz. True rms response to 30 mV**. Convenient pushbutton ranging. DC analog output. Hiqh input resistance, low input capacitance. Overload protection to 400 Vdc and 10 Vac. SWR less than 1.2 up to 1.2 GHz. *To 30f) V, up to 700 MHz, with accessory 100:1 divider. **To 3 V, up to 700 MHz, with accessory 100:1 divider. The characteristics of the instrument include: high reliability, fast warmup (1 minute typical), long intervals between calibrations, Plug-In PC boards for ease in servicing or modifying, light weight, and other advantages of solid state design.

show more

Service and User Manual
Manual Type:
Service and User Manual
Pages:
51
Size:
2.95 Mbytes (3093334 Bytes)
Language:
english
Revision:
Manual-ID:
Date:
1980 12 01
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
2017 01 23
MD5:
fcced6b49bc4930fa7a9dcc821ed4817
Downloads:
543

Information

INTRODUCTION 1.1 GENERAL 1.2 EQUIPMENT DESCRIPTION 1.2.1 Frequency Capability 1.2.2 Voltage Capability 1.2.3 True RMS Response 1.2.4 Low Noise 1.2.5 Minimal Zero Adjustment 1.2.6 DC Output SPECIFICATIONS OPERATION 3.1 INSTALLATION 3.1.1 Operating Controls and Indicators 3.2 OPERATING PROCEDURES 3.2.1 Initial Operating Procedure 3.3 OPERATING NOTES 3.3.1 Overload Limits 3.3.2 Connection for Measurements Below 100 MHz 3.3.3 Connection for Measurements Above 100 MHz 3.3.4 Low-Level Measurement 3.3.5 Making the Zero Adjustment 3.3.6 Signal Overload on 1 mV Range 3.3.7 Temperature Effects 3.3.8 Hum, Noise, and Spurious Pickup 3.4 DC OUTPUT 3.5 LOW FREQUENCY MEASUREMENTS 3.6 CORRECTION CURVE FOR MODEL 91-8B, 50 OHM ADAPTER 3.7 CORRECTION CURVE FOR MODEL 91-14A, 50 OHM TEE ADAPTER THEORY OF OPERATION 4.1 GENERAL 4.1.1 RF Probe 4.1.2 Attenuator and Amplifiers 4.1.3 Synchronous Detector 20 4.1.4 Shaping Amplifier 21 4.1.5 Chopper-Driver Circuits 21 4.1.6 Power supply 21 4.1.7 Proyramming 21 V MAINTENANCE 22 5.1 PERIODIC CALIBRATION 22 5.2 PRECAUTIONS WHEN CHECKING CALIBRATION 22 5.J CALIBRATION CHECK 2 3 5.4 CALIBRATION PROCEDURE 2 3 5.5 TROUBLESHOOTING PROCEDURE 25 5.5.1 Cover Removal 2 5 5.5.2 Chopper Replacement 25 5.5.3 Voltaqe and Resistance Tests 25 5.5.4 Test Points 26 5.5.5 Replacement of RF Probes 26 5.5.6 Probe Tests 26 VI Interface 32 6.1 INPUT CHARACTERISTICS 32 6.2 INPUT PULL-UP 3 3 6.3 ANALOG OUTPUT 3 3

show more