Many engineers struggle to get accurate impedance data when the test instrument is slow or has a limited frequency range. Bad data can delay a project, raise costs, and cause design mistakes. The Keysight E4990A-120 solves this by delivering fast, precise measurements from 20 Hz up to 120 MHz, so you can trust every reading and finish work on schedule.
Keysight E4990A-120, 10.4-inch color LCD, Impedance Analyzers with Keysight
If you need a reliable way to test components, debug circuits, or certify products, this analyzer is built for you. It combines a large color screen with four-terminal-pair measurement and 1 mHz resolution. The result is clear data that helps you avoid re-work and meet tight deadlines. Keysights reputation for quality means the instrument stays accurate even in a busy lab.
Key Features
- Frequency range: 20 Hz - 120 MHz.
- Resolution of 1 mHz for detailed analysis.
- Four-terminal-pair (4TP) measurement for low-error results.
- 10.4-inch TFT color LCD with 1024 768 resolution.
- Multiple sweep types: linear, log, voltage, current, bias.
- Up to 1601 measurement points per sweep.
- Trigger modes: continuous, single, averaging.
- GPIB, USB, LAN, and VGA interfaces for flexible connectivity.
- External reference input and output for crystal-locked stability.
- Built-in OPEN, SHORT, LOAD calibration and fixture compensation.
Specifications
| Manufacturer |
Keysight Technologies |
| Model |
E4990A-120 |
| Product Type |
Precision Impedance Analyzer |
| Frequency Range |
20 Hz to 120 MHz |
| Frequency Resolution |
1 mHz |
| Measurement Configuration |
Four-terminal pair (4TP) |
| Measurement Parameters |
|Z|, θZ, |Y|, θY, Cp, Cs, Lp, Ls, Rp, Rs, D, Q, X, G, B, Complex Z, Complex Y |
| Test Signal Voltage |
5 mVrms to 1 Vrms |
| Voltage Resolution |
1 mV |
| Test Signal Current |
200 µArms to 20 mArms |
| Current Resolution |
20 µA |
| Output Impedance |
25 Ω (nominal) |
| DC Bias Voltage |
0 to ±40 V |
| DC Bias Current |
0 to ±100 mA |
| Sweep Types |
Linear Frequency, Log Frequency, Signal Voltage, Signal Current, DC Bias Voltage, DC Bias Current |
| Measurement Points |
2 to 1601 |
| Number of Sweep Segments |
1 to 201 |
| Trigger Modes |
Continuous, Single, Averaging |
| Trigger Sources |
Internal, External (BNC), GPIB, USB, LAN, Manual |
| Measurement Time |
5 selectable speed/accuracy levels |
| Averaging |
Sweep averaging and Point averaging (1–999) |
| Display |
10.4-inch TFT Color LCD |
| Display Resolution |
1024 × 768 (XGA) |
| Data Traces |
4 traces per channel |
| Memory Traces |
4 traces per channel |
| Marker Functions |
Up to 10 independent markers per trace |
| Equivalent Circuit Analysis |
3-component (4 models) and 4-component (3 models) |
| Calibration |
OPEN, SHORT, LOAD; Fixture Compensation; Port Extension |
| External Reference Input |
10 MHz, 50 Ω BNC |
| Internal Reference Output |
10 MHz, 50 Ω BNC |
| External Trigger |
TTL, BNC |
| Interfaces |
GPIB (IEEE-488), USB Host, USBTMC, LAN (10/100/1000 Base-T), VGA Output, Handler Interface |
| Power Supply |
100–240 VAC, 47–63 Hz |
| Maximum Power Consumption |
300 VA |
| Typical Power Consumption |
160 W |
| Operating Temperature |
+5°C to +40°C |
| Storage Temperature |
-10°C to +60°C |
| Operating Humidity |
20–80% RH (non-condensing) |
| Storage Humidity |
20–90% RH (non-condensing) |
| Operating Altitude |
Up to 2,000 m |
| Weight |
14 kg |
| Safety Standards |
IEC/EN 61010-1, CSA C22.2 No. 61010-1, UL 61010-1 |
| EMC Standards |
IEC 61326-1, CISPR 11 Group 1 Class A |
| Compliance |
CE, UKCA, RCM, KC, WEEE |
