Option 002 : Provides Linear dB Scale
The 8405A Vector Voltmeter measures voltage vectors described by both
magnitude and phase, 2 channels allows for ratio measurements. Measurement capabilities include insertion loss and group delay of passband-filters and other transmission devices, gain and phase margin of amplifiers, complex impedance of mixers, antennas, etc. in the frequency range of 1 to 1000MHz. Gain or loss in excess of 90 dB and phase measurements with 0.1º resolution over a 360º phase range are possible.
Vector Voltmeter from H/P, Model 8405A. Measures voltage vectors described by both magnitude and phase. This capability makes this a unique instrument for about any design and test application in the frequency range of 1 to 1000 kHz.
Capabilities include insertion loss and computed group delay of bandpass filters and other transmission devices, gain and phase margin of amplifiers, complex impedance of mixers, antennas, matching the electrical lengths of cables, S-parameters of transistors, amplitude modulation index, RF distortion measurements.
Two channel capability enables voltage magnitude measurements in either channel, allows ratio measurements and phase difference measurement between the two. Gain or loss in excess of 90 dB and phase measurements with 0.1 degree resolution over a 360 degree phase range are possible.
Accuracy is achieved through the 1kHz bandwidth entailing response only to the fundamental frequency of the input signal. Also phase-locked coherent sampling to translate 1-1000MHz RF signals to 20kHz IF signals enables accurate detection of voltage magnitude and phase. Automatic phase locked tuning makes it possible to select the one of 21 overlapping octave ranges which contains the input signal frequency by simply rotating the switch.
Frequency range: 1MHz to 1GHz in 21 overlapping octave bands; tuning automatic within each band; Isolation beween channels 1 to 300MHz,>100dB; 300 to 1,000MHz>80dB; Max. input AC (2 Vpeak) DC(+-50V); input impedance (nominal): 0.1 Mohm shunted by 2.5pF; Ranges 100uV to Vrms full scale in 10dB steps; Phase range 360 degree indicated on zero-center meter with end-scale ranges of +-180,+-60, +-18, +-6 degrees; Phase resolution 0.1 degree at any phase angle;