The Keysight E4990A is a versatile benchtop impedance analyzer designed for evaluating components, materials, and circuits. It offers continuous frequency coverage from 20 Hz up to 120 MHz (depending on the installed option) and provides excellent measurement performance with a basic impedance accuracy of 0.08% (0.045% typical). Built as the successor to the industry-standard 4294A, it features a wide impedance measurement range, extensive DC bias capabilities, and a large touch-screen interface for advanced equivalent circuit analysis and component evaluation.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | USB (Host/Device), LAN, GPIB, Handler |
| Display | 10.4-inch color TFT LCD touch screen |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 90 to 264 VAC, 47 to 63 Hz |
| Operating Temperature | 5 °C to 40 °C |
Measurement Parameters
| Parameter | Value |
|---|---|
| Impedance (Z) Range | 25 mΩ to 40 MΩ (10% measurement accuracy range) |
Test Frequency
| Parameter | Value |
|---|---|
| Frequency Range | 20 Hz to 10 / 20 / 30 / 50 / 120 MHz (by option) |
| Frequency Resolution | 1 mHz |
Test Signal (Source)
| Parameter | Value |
|---|---|
| Test Signal Voltage Range | 5 mVrms to 1 Vrms |
| Internal DC Bias Voltage Range | -40 V to +40 V |
| Internal DC Bias Current Range | -100 mA to +100 mA |
Measurement Accuracy and Speed
| Parameter | Value |
|---|---|
| Basic Impedance Accuracy | 0.08% (0.045% typical) |
| Measurement Time (Fast) | 3 ms / point |
| Trigger Modes | Internal, External, Manual, Bus |
Sweep Characteristics
| Parameter | Value |
|---|---|
| Sweep Parameters | Frequency, AC voltage, AC current, DC bias voltage, DC bias current |
Calibration and Compensation
| Parameter | Value |
|---|---|
| Standard Calibration | Open, Short, Load |
Display and Analysis
| Parameter | Value |
|---|---|
| Equivalent Circuit Analysis | Supported (3-element and 4-element models) |
Environmental
| Parameter | Value |
|---|---|
| Storage Temperature | -10 °C to 60 °C |
| Operating Altitude | Up to 2,000 meters |
Sweep & Measurement
| Parameter | Value |
|---|---|
| Maximum Sweep Points | 1601 points |
Configuration
| Parameter | Value |
|---|---|
| Channels | 4 channels |
| Traces per Channel | 4 data traces and 4 memory traces |
DC Bias
| Parameter | Value |
|---|---|
| DC Bias Voltage Resolution | 1 mV |
Test Signal
| Parameter | Value |
|---|---|
| Auto Level Control (ALC) | Voltage and Current |
Test Terminals
| Parameter | Value |
|---|---|
| Test Terminal Configuration | 4-Terminal Pair (4TP) |
| Test Terminal Connectors | BNC female |
Inputs & Outputs
| Parameter | Value |
|---|---|
| External Reference Input Frequency | 10 MHz |
| Internal Reference Output Frequency | 10 MHz |
| External Trigger Input | BNC female, TTL/HCMOS compatible |
Technology
Impedance Analyzer
Applications
Passive component evaluation, material testing, semiconductor C-V measurement, resonator analysis