BALLANTINE 3440A RF MILLIVOLTMETER PDF

Mezira All switches are touch switches with high quality, providing good hand feeling and high reliability. The linear amplifier is an inverting dc amplifier with feedback gain stabilization utilizing a FET input high gain operational amplifier U7 typically a RCA type No. In the embodiments of FIGS. The output of resistor network is selected for each of the ranges by the eight position FET Switch U8.

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Kira DC output proportional to the ac input is provided for analog recorders and to allow operation as an ac-dc converter. More like hundreds of millivolts at best. Two principal techniques have been employed to deal with the low level and transition region response characteristics: Adjustable resistance Rg is used to adjust the gain of amplifier A 3 so that its output voltage V 3 is determined by the formula EQU3.

These characteristics cause the probe to have high input impedance over the mililvoltmeter wide frequency range from 10 kHz to beyond 1. High rms accuracy, traceable to NIST, is assured regardless of waveshape.

A — Ballantine Laboratories, Inc. In the embodiments of FIGS. A monolithic square root converter U6 typically a Analog Devices type No. EXTECH PDF In a typical RF millivoltmeter made in accordance with my invention, the detector probe ff is simply amplified sufficiently to place the detected signal in a predetermined amplitude range.

There are three display ways including voltage, ef and dBm, supplying a clear and intuitive display. I have invented an improved meter circuit which is particularly useful for measuring radio frequency signals over a broad bandwidth in the millivolt ranges.

The detector operates in the square law region below 30 mV rms input and the instrument provides rms response in this region. The input amplifiershown in detail in FIG. Resistor R28 in the preamplifier is adjusted to compensate for input offset errors to amplifier U4 by setting its output to zero on the 30 mV Range.

As the input signal exceeds 30 mV rms the response gradually approaches peak-to-peak at mV and above. Even the cable is a special low noise type.

Maybe this is something the Chinese should start making. Therefore, it may well be worth the time and expense to track down some probes. Users browsing this forum: Gain is set by potentiometer R51 in combination with resistor R47 and resistor R Probes are usually bad because users like to measure the signal from their kilowatt linear with the ballxntine.

The connections made by switch U14 are given in Table 1 above. Auto measuring range switching makes your usage more convenient. The probe operates in the square law region for input signals below 30 mV and gradually becomes a linear detector as the input signal increases. Transistor Q2 is a grounded emitter power amplifier which is used to vary the collector voltage of Q1.

Numerous calibration adjustments are required with such successive approximation type millivoltmeters in order to optimize the match to the detector response.

Google [Bot]Prutser and 7 guests. The identification of specific components, component values and circuit details in this specification rd for illustrative purposes only. Related Posts.

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3440A RF Millivoltmeter | Ballantine

Kira DC output proportional to the ac input is provided for analog recorders and to allow operation as an ac-dc converter. More like hundreds of millivolts at best. Two principal techniques have been employed to deal with the low level and transition region response characteristics: Adjustable resistance Rg is used to adjust the gain of amplifier A 3 so that its output voltage V 3 is determined by the formula EQU3. These characteristics cause the probe to have high input impedance over the mililvoltmeter wide frequency range from 10 kHz to beyond 1. High rms accuracy, traceable to NIST, is assured regardless of waveshape.

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BALLANTINE 3440A RF MILLIVOLTMETER PDF

Felkree A RF Millivoltmeter Ballantine — TechRecovery, LLC My invention is also useful for narrower bandwidth devices where it is desireable to provide a transition between square law and linear function ranges, including meter circuits employing diode detectors preceded by an amplifier. Housed in superior grade of ABS body, unique design, very strong in construction, unbreakable and very high insulation. Relative gain or loss measurements are simplified by a ballqntine dB reference adjustment. Google [Bot]Prutser and 7 guests.

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