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Description: The Agilent 8981B vector modulation analyzer analyzes analog I and Q signals. Because it contains a calibrated demodulator it can also be connected to the IF of the modulator. This gives you the flexibility to examine changes in modulation down through the receiver chain and isolate faults quickly. It can be used to adjust and troubleshoot I/Q modulators, demodulators, and I/Q modulated signals that are used in digital mobile radio, microwave radio, and the transmission of digital video. It can be connected to the I/Q outputs of a demodulator in a receiver, or to IF test points. Once connected, the Agilent 8981B vector modulation analyzer displays constellations, EYE diagrams, and vector diagrams of digital modulation formats such as QPSK, 16QAM, 64QAM, and 256QAM. The analyzer also makes statistical measures of system quality such as closure, lock angle error, and quadrature error. Through these "constellation analysis" techniques, transmission quality can be measured and monitored to detect degradations in the transmission link before link bit error rates reach unacceptable levels.
This unit has the following features:
I & Q Display - Each I and Q channel is displayed vs. time on a separate grid, one above the other
Constellation Display - Displays Q vs. I at the instant defined by the time marker
3D Display - Useful for visual, or intuitive, analysis of I vs. Q vs. time waveforms. Signal can be rotated about any of 3 axes for optimal viewing
This unit has the following specifications:
Bandwidth (3dB): 350 MHz DC-coupled
DC vector accuracy using internal ADC: 1% of full scale
Input termination: 50 or 75
Input coupling: Each channel independently: ac, dc, or ground
Demodulation Mode
Modulated IF input frequency range: 50 to 200 MHz
Modulated IF input level range: 5 to 20 dBm
Coherent reference input frequency range: 50 to 200 MHz
Coherent reference input level range: 10 to 20 dBm
Baseband bandwidth (3 dB): 100 MHz with external filters
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