Keysight / Agilent 4294A Precision Impedance Analyzer, 40 Hz to 110 MHz

The Keysight/Agilent 4294A Precision Impedance Analyzer measures impedance across 40 Hz to 110 MHz with ±0.08% basic accuracy. This auto-balancing bridge instrument characterizes components, circuits, and materials in R&D, qualification, quality control, and production environments.

Technical Specifications

Frequency Range: 40 Hz to 110 MHz Impedance Measurement:

• Range: 3 mΩ to 500 MΩ (typical)


• Basic Accuracy: ±0.08%


• Q Accuracy: ±3% @ Q = 100, ≤10 MHz Test Signal Levels:


• Voltage: 5 mVrms to 1 Vrms, 1 mV resolution


• Current: 200 µArms to 20 mArms, 20 µA resolution DC Bias:


• Voltage: 0 V to ±40 V, 1 mV resolution


• Current: 0 mA to ±100 mA, 40 µA resolution Measurement Parameters: |Z|-θ, R-X, Ls-Rs, Ls-Q, Cs-Rs, Cs-Q, Cs-D, |Y|-θ, G-B, Lp-G, Lp-Q, Cp-G, Cp-Q, Cp-D, Complex Z-Y, |Z|-Ls, |Z|-Cs, |Z|-Lp, |Z|-Cp, |Z|-Rs, |Z|-Q, |Z|-D, Lp-Rp, Cp-Rp, plus basic parameters: |Z|, |Y|, θ, R, X, G, B, L, C, D, Q Sweep Capabilities:


• Parameters: Frequency, OSC level (V/I), DC bias (V/I)


• Modes: Linear, Log, List; Manual Up/Down; Segment sweep


• Points: 2 to 801 per sweep


• Speed: 3 msec/point @ f ≥ 500 kHz, BW = 1 Display & Interface:


• 8.5-inch TFT color display with VGA monitor output


• LAN (10 Base-T), Centronics printer, two programmable digital I/O (24-bit and 8-bit) Environment:


• Operating Temperature: 0 °C to 40 °C


• Warm-up: ≥30 minutes

Key Features

• Four-terminal pair configuration (standard)


• High Q/low D accuracy for low-loss component analysis


• DC voltage bias to ±40 V or DC current bias to ±100 mA


• Advanced calibration and error compensation


• Equivalent circuit analysis function

Measurement Configurations

• Four-terminal pair (standard)


• 7-mm one-port (with 42942A Terminal Adapter)


• Impedance probe (with 42941A Impedance Probe)

Typical Applications Component and circuit characterization, DC bias dependency evaluation, fixture-based in-situ testing, and production quality control across wide impedance and frequency ranges.