The Keysight (formerly Agilent) E4991A is an RF impedance and material analyzer designed to deliver high-precision component and material evaluation from 1 MHz to 3 GHz. It features a basic impedance measurement accuracy of ±0.8% and provides a comprehensive set of sweep parameters including frequency, AC signal level, and DC bias. Operating on a Windows-based architecture, the analyzer includes built-in VBA programming capabilities for streamlined automation. With available options, the E4991A can perform direct read-outs of material permittivity and permeability, as well as complex on-wafer and temperature characteristic measurements.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | LAN, GPIB |
| Display | Color LCD with Windows-styled user interface |
| Internal Storage | Internal HDD and 3.5-inch 1.44 MB Floppy Disk Drive |
| Warm-up Time | 30 minutes |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 90 to 132 VAC / 198 to 264 VAC, 47 to 63 Hz, 350 VA max |
| Operating Temperature | 5 to 40 °C |
Test Signal Characteristics
| Parameter | Value |
|---|---|
| Frequency Range | 1 MHz to 3 GHz |
Measurement Parameters
| Parameter | Value |
|---|---|
| Impedance Parameters | |Z|, |Y|, θ, R, X, G, B, L, C, D, Q, |Γ|, Γx, Γy |
| Material Measurement Parameters | Permittivity (ε), Permeability (μ) (Option dependent) |
Measurement Range and Accuracy
| Parameter | Value |
|---|---|
| Basic Impedance Accuracy | ±0.8% |
Sweep Characteristics
| Parameter | Value |
|---|---|
| Sweep Parameters | Frequency, AC Level, DC Bias |
| Number of Sweep Points | 2 to 801 points |
Display and Analysis
| Parameter | Value |
|---|---|
| Programming / Scripting | Built-in VBA (Visual Basic for Applications) programming function |
Material Measurement (Optional)
| Parameter | Value |
|---|---|
| Material Measurement | Direct read-out permittivity and permeability (Option dependent) |
General Specifications
| Parameter | Value |
|---|---|
| On-Wafer Measurement | Supported (Option dependent) |
| Temperature Characteristic Measurement | Supported (Option dependent) |
| Test Fixture Compatibility | Supports various test fixtures for components |
Inputs & Outputs
| Parameter | Value |
|---|---|
| Test Port Connector | 7 mm (APC-7) on test head |
| Output Impedance | 50 Ω (nominal) |
Performance
| Parameter | Value |
|---|---|
| DC Bias (Option 001) | ±40 V, ±50 mA |
Calibration & Correction
| Parameter | Value |
|---|---|
| Calibration Methods | Open, Short, Load, Low-Loss Capacitor |
| Compensation Methods | Open, Short, Port Extension, Fixture Electrical Length |
Frequency
| Parameter | Value |
|---|---|
| Frequency Resolution | 1 mHz |
Measurement
| Parameter | Value |
|---|---|
| Impedance Measurement Range | 120 mΩ to 52 kΩ (10% accuracy range) |
| Averaging | 1 to 999 factor |
Control & Trigger
| Parameter | Value |
|---|---|
| Trigger Modes | Internal, External, Manual, Bus |
Technology
RF Impedance and Material Analysis
Applications
High-frequency component evaluation, dielectric and magnetic material characterization, on-wafer testing