Agilent-HP 415E SWR Meter

Agilent-HP 415E SWR Meter is a low noise, 1000 Hz tuned amplifier and voltmeter, calibrated in dB and SWR. Designed for use with square law detectors, it measures SWR< attenuation, and gain directly from metered scales, or drives an X-Y recorder for RF substitution measurements. Front panel INPUT switch selects unbiased low (50-200 Ohms) or high (2500-10,000 Ohms) impedance crystal, biased crystal (1 V into 1 kOhm), or low or high current bolometer (4.5 or 8.7 mA +- 3% INTO 200 Ohms)

An internal precision 60 dB attenuator allows the HP 415E to operate over a 70 dB range in 10 or 2 dB steps, with +- 0.05 dB accuracy for a 10 dB step; maximum cumulative error between any two 10 dB steps is +- .1 dB. Sensitivity is 0.15uV rms for full scale deflection at maximum bandwidth.