HP/Agilent 8981B

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.

The Agilent 8981B vector modulation analyzer and Agilent 8780A/8782B vector signal generators can be used to adjust and troubleshoot I/Q modulators, demodulators, and I/Q modulated signals used in digital mobile radio, microwave radio, and the transmission of digital video. The analyzers 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.

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.

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.

Supplemental characteristic of 35 MHz with internal filters Corrected vector dc accuracy at 70 MHz: (typical from 50 to 200 MHz) 2% of full scale IF input

Supplemental Characteristics Quadrature error: Corrected: 0.5; Uncorrected:1 I/Q gain imbalance (dc to 10 kHz): Corrected, 0.1 dB; Uncorrected, 0.25 dB

Environmental Power Requirements Voltage: 100, 120, 220, 240 Vac, 10% to 10%; 48 to 66 Hz Power: 245 W, 320 VA maximum Size: 5-1/4-in rack height, one module width 23D Agilent System II cabinet Weight: Net, approximately 20 kg (45 lb) Shipping, approximately 24 kg (53 lb)

Ordering Information:

Agilent HP 8981B 50 MHz to 200 MHz IF Vector Modulation Analyzer