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The HP 415E SWR Meter is a low noise, tuned amplifier-voltmeter calibrated in dB and SWR for use with square law detectors. It is an extremely useful instrument for measuring SWR, attenuation, and gain directly from metered scales, or as a tuned amplifier for driving an X-Y recorder when making RF substitution measurements. The 415E responds to a standard tuned frequency of 1000 Hz. This frequency is front panel adjustable over a range of 7% for exact matching to the internal I kHz modulation of the signal source being used. Amplifier bandwidth is also adjustable from 15 to 130 Hz. The narrow bandwidth allows maximum sensitivity at CW frequencies while the wider bandwidths enable swept tests to be displayed on an oscilloscope or X-Y recorder. Specifications. Sensitivity: 0.15 uV rms for full-scale deflection at maximum bandwidth (1 uV rms on high impedance crystal input). Noise: at least 7.5 dB below full scale at rated sensitivity and 130 Hz bandwidth with input terminated in 100 or 500 ohm; noise figure less than 4 dB. Range: 70 dB in 10 and 2-dB steps. Accuracy: ±0.05 dB/ 10 step; maximum cumulative error between any two 10 dB steps, ± 0.10 dB; maximum cumulative error between any two 2 dB steps, ±0.05 dB; linearity, ±0.02 dB on expand scales, determined by inherent meter resolution on normal scales. Input frequency: 1000 Hz adjustable 7%; other frequencies between 400 and 2500 Hz available on special order. Options. Opt 001: rechargeable battery installed. Opt 002: rear panel input connector in parallel with front panel connector.
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