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The EIP 545A frequency counter is a microprocessor-based heterodyne instrument that spans the frequency range from 10 Hz to 18 GHz. Using keyboard control, the 545A counter provides frequency offsets and frequency selectivity. Options include Power Measurement, full Systems capability via GPIB or BCD/Remote Programming and D/A Converter output. Full frequency range is covered in three bands. Band 1 is a high impedance input (1 Mohm/20 pF), and spans a 10 Hz to 100 MHz range, with a sensitivity of 25 mV RMS. Band 2 has an input impedance of 50 ohms, a 10 MHz to 1 GHz range, with a sensitivity of -20 dBm. Band 3 has an input impedance of 50 ohms nominal over a range of 1 GHz to 18 Ghz, and sensitivity to -30 dBm. Measurements are presented on a 12 digit LED display that is sectionalized to read GHz, MHz, kHz, and Hz. When the optional power measurement function is activated, the digits on the far right display power in dB, with 0.1 dB resolution, and frequency resolution is limited to 100 kHz.
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