The Keysight E4991B is a high-performance impedance analyzer designed for R&D, quality assurance, and production testing of passive electronic components, semiconductor devices, and materials. With three frequency options from 1 MHz up to 3 GHz, it provides industry-leading accuracy and material measurement capabilities.
Specifications
General
| Parameter | Value |
|---|---|
| Display | 10.4-inch TFT color LCD with resistive touch screen |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 90 V to 264 V AC, 47 Hz to 63 Hz, 300 VA maximum power consumption |
| Operating Temperature | 5 °C to 40 °C |
| Dimensions (W×H×D) | 426 mm × 185 mm × 415 mm (main unit) |
| Weight | 13 kg (main unit) |
| Test Head Cable Length | 1 m (standard) |
| Test Head Dimensions (W×H×D) | 145 mm × 70 mm × 170 mm |
Stimulus AC Signal Characteristics
| Parameter | Value |
|---|---|
| Frequency Options | 1 MHz to 500 MHz (Option 050), 1 MHz to 1 GHz (Option 100), 1 MHz to 3 GHz (Option 300) |
| Frequency Resolution | 1 mHz |
| Frequency Accuracy | ±10 ppm (standard), ±1 ppm (with Option 1E5 high stability time base) |
| AC Voltage Signal Level Range | 4.4 mV to 1 Vrms (at test port) |
| AC Current Signal Level Range | 0.089 mA to 20 mArms (at test port) |
| AC Power Signal Level Range | -40 dBm to +1 dBm |
| Source Output Impedance | 50 Ω (nominal) |
Measurement Capabilities & Parameters
| Parameter | Value |
|---|---|
| Primary Measurement Parameters | |Z|, |Y|, R, X, G, B |
| Secondary Measurement Parameters | θ, Ls, Lp, Cs, Cp, Rs, Rp, D, Q |
| Material Measurement Parameters | Complex Permittivity (εr', εr''), Complex Permeability (μr', μr'') |
| Basic Impedance Accuracy | ±0.65% |
DC Bias Source
| Parameter | Value |
|---|---|
| Internal DC Bias Voltage Range | -40 V to +40 V (requires Option 001) |
| Internal DC Bias Current Range | -100 mA to +100 mA (requires Option 001) |
| DC Bias Monitor Outputs | DC Bias monitor voltage and current available via display and SCPI commands |
Sweep & Measurement Speed
| Parameter | Value |
|---|---|
| Sweep Types | Linear frequency, Logarithmic frequency, Segment frequency, AC level (V/I), DC Bias (V/I, with Option 001) |
| Number of Sweep Points | 2 to 1601 points |
| Averaging Factor Range | 1 to 999 |
Calibration & Compensation
| Parameter | Value |
|---|---|
| Calibration Types | Open, Short, Load, Low-Loss Capacitor Calibration |
| Compensation Functions | Port Extension, Fixture Compensation |
Display & User Interface
| Parameter | Value |
|---|---|
| Trace Formats | Log/Linear/Segment magnitude, Phase, Real/Imaginary, Cole-Cole plot, Polar plot |
| Maximum Number of Channels | 4 channels |
| Maximum Number of Traces | 4 traces per channel |
| Equivalent Circuit Analysis | 5 built-in circuit models |
Interfaces & Connectivity
| Parameter | Value |
|---|---|
| External Trigger Input | BNC female, 10 kΩ nominal input impedance |
| External Reference Input | 10 MHz ± 10 ppm, BNC female |
| Internal Reference Output | 10 MHz, BNC female |
Physical & Environmental
| Parameter | Value |
|---|---|
| Storage Temperature Range | -20 °C to 60 °C |
| Operating Humidity Range | 20% to 80% RH (non-condensing, wet-bulb temp < 29 °C) |
| Test Head Weight | 1.8 kg |
Measurement Port
| Parameter | Value |
|---|---|
| Test Port Connector Type | APC-7 |
| Test Port Nominal Impedance | 50 Ω |
Frequency Reference
| Parameter | Value |
|---|---|
| Standard Frequency Stability | ±7 ppm/year, ±5 ppm (5 °C to 40 °C) |
| High Stability Timebase (Option 1E5) Frequency Stability | ±1 ppm/year, ±0.5 ppm (0 °C to 40 °C) |
Measurement Options
| Parameter | Value |
|---|---|
| Probe Station Connection Kit (Option 001) | Enables connection to external RF probe stations |
| Material Measurement Firmware (Option 002) | Supports permittivity and permeability analysis |
| Temperature Characteristic Test Kit (Option 007) | Enables measurements from -55 °C to +150 °C with high-temperature cable |
System Features
| Parameter | Value |
|---|---|
| Limit Line Testing | Pass/Fail testing against user-defined limits |
Power
| Parameter | Value |
|---|---|
| Power Consumption | 350 VA maximum |
System
| Parameter | Value |
|---|---|
| LXI Compliance | LXI Core 2011 Compliant |
| Operating System | Windows 7 or Windows 10 (depending on date of manufacture) |
Calibration
| Parameter | Value |
|---|---|
| Calibration Standards | Open, Short, Load, Low-Loss Capacitor |
Options
| Parameter | Value |
|---|---|
| Removable SSD Option | Option 017 |
Technology
RF Impedance Analyzer / Material Analyzer
Applications
Passive component evaluation, semiconductor wafer-level measurements, dielectric/magnetic material characterization