Anritsu 37347A Vector Network Analyzer (40 MHz to 20 GHz)

The Anritsu 37347A is a microprocessor-controlled vector network analyzer delivering S-parameter measurements from 40 MHz to 20 GHz in a compact benchtop format. It integrates a synthesized source, S-parameter test set, and tuned receiver into a single unit, enabling fast 12-term error-corrected sweeps with rapid GPIB data transfer. Four independent measurement channels support S11, S21, S22, S12, and user-defined combinations of incident and reflected waves. The instrument measures up to 1601 data points per sweep - selectable to 801, 401, 201, 101, or 51 points without recalibration - and accepts arbitrary discrete point sets (2 ≤ N ≤ 1601). Measurement frequency windows can be narrowed within the calibration range, and CW mode enables single-frequency analysis. A 10 Hz IF bandwidth and 512 averages support precision measurements with noise floors ranging from −65 dBm at 0.04 GHz to −91 dBm at 2 GHz. Maximum receiver dynamic range reaches 128 dB at 2 GHz, while system dynamic range extends to 98 dB across the operating band. Port 1 delivers 5 dBm at both band edges. An 8.5-inch color LCD or external VGA monitor displays results in multiple formats: log magnitude, phase, Smith chart (impedance and admittance), linear and log polar, group delay, and linear magnitude. Error correction includes LRL/LRM and adapter removal calibrations with integrated AutoCal control. High-level noise remains below 0.04 dB with <0.5 peak-to-peak ripple in 1 kHz IF bandwidth to 20 GHz. Typical measurement time for 101 data points across the full band is 500 ms. Port 1 features a 1 watt, 70 dB step attenuator; optional Port 2 test attenuator (40 dB) is available. Internal bias tees simplify DC biasing of active devices. Source frequency resolution is 1 kHz standard, upgradable to 1 Hz with Option 10A. Optional time-domain capability (Option 2) provides distance and delay analysis.