TM 11-6625-3060-10
Section II. Equipment Description
CHARACTERISTICS, CAPABILITIES AND FEATURES
ME-526A/USM provides digital display of measurements from the low radio frequencies through approximately 1.2
gigahertz (GHz), over a voltage range of 200 microvolts (uV) to 3.0 volts.
The ME-526A/USM exhibits true root mean square (rms) response for input signals up to 30 millivolts (m), gradually
approaching peak-to peak above this level. The digital voltmeter display is calibrated in rms above this level.
The instrument has a high input impedance with stability, and low noise. A small edgewise dBm meter (used for
reference and scale adjustment) is located on the front panel. This is used for zeroing the instrument on the lowest full
scale range (the digital display blanks out below 200 uV).
A binary coded decimal (BCD) output is provided at a rear recorder connector, permitting the ME-526A/USM to be
integrated in systems for driving printers, tape or card punches, data control units, and similar interfacing data
equipment. As pat of a system, the ME-526A/USM is also programmed and controlled externally as needed.
A linear direct current (dc) output, whose level is proportional to the radio frequency (rf) input voltage, is also provided
at a rear connector. This may be used to drive a recorder remote indicator, or other analog device.
Uses of the ME-526A/USM are:
1. Transistor parameter measurements.
2. Voltage standing wave ratio (vswr) and return loss measurements using the ME-526A/USM with bridge methods,
directional couplers, and adjustable or slotted lines.
3. 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.
4. Adjustment of tuned circuits in narrow-band amplifiers.
5. The adjustment, measurement of performance, and evaluation of parameters of rf filters.
6. Measurement of vswr or return loss and attenuation of rf attenuators.
7. Measurement of output levels of signal generators, adjustment of baluns, harmonic distortion of rf signals, and
adjustment of circuits for minimum voltage (null) of maximum voltage (peak).
1-2
