One of the Model 92 Series of RF Millivoltmeters, the Model
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
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
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
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
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
PC boards for ease in servicing, light
weight, and other advantages of solid-state design.