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The EIP 538B frequency counter is a microprocessor-based heterodyne instrument. It spans the frequency range from 10 Hz to 26.5 GHz. Through keyboard control, the counter provides frequency offsets and frequency multiplication. Options include full systems capability via GPIB and high stability time bases. Measurements are presented on a 12 digit LED display that is sectionalized to read GHz, MHz, kHz, and Hz. Full frequency range is covered in three bands. Band 1 is 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 is an input impedance of 50 ohms, a 10 MHz to 1 GHz range, a sensitivity of -20 dBm. Band 3 has an input impedance of 50 ohm nominal over the range of 1 GHz to 20 GHz (or 26.5 GHz), and a sensitivity to -30 dBm (typical).
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