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The HP 5355A is an Automatic Frequency converter plug in, together with the HP 5356A, 5356B, or 5356C frequency converter head, provides pulsed and CW frequency measurement capability to 18/26.5/40 GHz for the HP 5345A counter. A 0.4-1.5 GHz prescaled input offers pulsed and CW measurement for the lower microwave range even without one of the heads. The HP 5355A's internal microprocessor controls the measurement algorithm, computes the input microwave frequency, and displays it on the eleven digit HP 5345A display. Superior pulsed RF performance is provided with selectable resolution to 100 Hz and better, with accuracy to 3 kHz. Internal pulse detection circuitry sets the counters gate for maximum resolution for any pulse width down to 75 ns. External gating allows samples as small as 20 ns for performing dynamic frequency profiling of "CHIRPS" and other FM on the RF burst. This is also an excellent CW microwave counter, providing 1 Hz resolution in 1 second. Automatic amplitude discrimination and 60 MHz FM tolerance allows this counter to correctly measure carrier frequencies in the most difficult transmitted signals. Microprocessor control provides automatic operation and diagnostic routines for quick easy failure isolation. The front panel keyboard provides user definable offsets including an mx±b offset mode for receiver testing, where the local oscillator can be measured directly then multiplied by the appropriate harmonic number. Offsetting this by the receiver's IF allows the counter to conveniently display the tuned receiver frequency.
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