Keysight (Agilent/HP) 8508A
For RF voltage and phase measurements, dynamic range over 90 dB, sensitivity 10 µV, Phase difference measurement between both input channels with up to 0.1° resolution over the full ±180° range, also for measuring electrical length, phase distortion or impedance, Frequency range (with HP 85081 A input module) 100 kHz to 1 GHz, with HP 85082 A (50 Ohm input module) 300 kHz to 2 GHz, maximum input voltage 2 V peak AC or ±50 VDC, LED indicators, HPIB interface. VECTOR VOLTMETER 100 kHz - 1 GHz / 2 GHz
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Keysight (Agilent/HP) 8508A