One of the Model 92 Series of RF Millivoltmeters, the Model 92BD provides digital readout of measurements from the low radio frequencies to the gigahertz region, over a voltage range of 200 pV to 3 volts. It is a programmable, solid-state instrument of high sensitivity and accuracy: The Model 92BD exhibits true rms response for input signals up to 30 millivolts, gradually approaching peak-to-peak above this level. The digital voltmeter, however, is calibrated in rms above this region. The instrument is characterized by high input impedance (see Figures 1 and 2) , excellent stability, and low noise. A small edgewise panel meter, calibrated in dBm, is included; this is necessary for zeroing the instrument (the digital display blanks out below 200 yV) , and will also serve for comparative measurements of acceptable accuracy. A binary coded decimal (BCD) output is provided at a rear connector, permitting the 92BD to be integrated in systems for driving printers, tape or card punches, data control units, and similar interfacing data equipment. As part of a system, the 92BD is also programmed and controlled externally as needed. 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 92BD offers a convenient and accurate means for making a wide variety of measurements. Typical uses of this instrument would include: In transistor testing the instrument may be used to measure (3, ffc, and other transistor parameters. VSWR and return loss measurements 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 cutoff 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 parameters of rf filters. 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 92BD is available in several optional configurations with a basic accuracy of 1% rdg. + 1% fs. The standard features of the instrument are: Programmable (logic level). Measures from 200 mV to 3 V* from 10 kHz to 1.2 GHz. True rms response to 30 mV**. Convenient push-button ranging. BCD digital output plus dc analog output. High input resistance, low input capacitance. Overload protection to 400 Vdc, 10 Vac. VSWR less than 1.15 up to 1.2 Gf&. *To 300 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 warm-up (1 minute), long intervals between calibrations, plug-in PC boards for ease in servicing, light weight, and other advantages of solid-state design.