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The HP 5345A is an Electronic Counter that represents one of the most advanced general purpose instruments in the Hewlett-Packard Counter Product Line. Utilizing monolithic bipolar integrated circuit technology especially designed and manufactured at Hewlett-Packard, this instrument provides unsurpassed power, versatility and flexibility in frequency and time measurements. The HP 5355A plug-in extends the capability and frequency range of the HP 5345A mainframe. Input Signal Conditioning: The fully optimized front end includes switchable 500./1 Mo. input impedance, dc/ac coupling, and slope selection. The sensitive wideband amplifiers assure measurements on even the lowest level sinusoidal and digital signals. Also featured is an extremely wide linear operating range of -2 to +2 Vdc. Frequency measurements are made direct from dc to 500 MHz. Using the reciprocal technique, 9 digits of resolution occur in a one second gate time over the entire frequency range. This means a 1 MHz input can be resolved to 2 X 10-9 (= 0.002 Hz) in one second. This high resolution in a short period of time can be traded for greater measurement speeds. Using a 100 us gate with a resolution of 2 X 10-5 the measurement can now be made 5000 times a second. Up to 9000 readings a second can be output to the Interface Bus using the computer dump mode.
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