# Agilent 4294A Precision Impedance Analyzer, 40 Hz to 110 MHz (Pre-Owned) # Agilent 4294A Precision Impedance Analyzer, 40 Hz to 110 MHz (Pre-Owned) ## Key Features At A Glance - Frequency range from 40 Hz to 110 MHz with 1 mHz resolution for broadband impedance characterization - Four-terminal pair measurement configuration via four BNC connectors, convertible to 7 mm or 3.5 mm ports with optional adapters - Programmable test signal: 5 mVrms to 1 Vrms voltage or 200 µArms to 20 mArms current with integrated signal-level monitoring - Built-in DC bias: 0 to ±40 V voltage or 0 to ±100 mA current with constant-voltage and constant-current modes - Basic impedance accuracy of ±0.08% under optimal conditions; supports |Z|-θ, R-X, Ls-Q, Cs-D, Cp-G and full complex Z-Y parameter sets - Sweep types include Linear, Log, List (up to 18 segments), Zero-span, and Manual across 2 to 801 measurement points - Equivalent circuit analysis with 3- and 4-component models, plus 18-segment limit line testing for component pass/fail - GPIB (IEEE-488), LAN (10 Base-T), 24-bit handler I/O, and Instrument BASIC standard for automated test integration The Agilent 4294A Precision Impedance Analyzer characterizes passive components and materials from 40 Hz to 110 MHz using a four-terminal pair measurement configuration. The instrument resolves frequency to 1 mHz across the full span and measures impedance parameters including |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, and complex Z-Y. Four BNC female connectors at the measurement port can be adapted to a 7 mm port using the 42942A Terminal Adapter or to a 3.5 mm port using the 42941A Impedance Probe. Component engineers, materials researchers, and quality control teams use precision impedance analyzers to characterize capacitors, inductors, transformers, and other passive components across frequency — revealing self-resonance, parasitic behavior, equivalent series resistance, and dielectric response that single-frequency LCR meters cannot capture. The 4294A's swept measurement extends impedance characterization from the audio band through HF, supporting both R&D component design validation and incoming-inspection workflows where DC bias-dependent behavior must be verified. ## Brand Heritage Hewlett-Packard's test and measurement business was spun off as Agilent Technologies in 1999, and Agilent's electronic measurement division subsequently became Keysight Technologies in 2014. The 4294A traces its lineage through this corporate history; instruments carrying the Agilent brand on the front panel are the direct predecessors of current Keysight precision impedance products. ## Accessories Supplied - Operation Manual (English/Japanese) - P/N 04294-900X0/04294-970X0 (if Option ABA/ABJ designated) - Programming Manual (English/Japanese) - P/N 04294-900X1/04294-970X1 (if Option ABA/ABJ designated) - Instrument BASIC User's Handbook - P/N E2083-90005 (if Option ABA/ABJ designated) - Sample Program Disk (3.5 inch) - P/N 04294-180X0 (if Option ABA/ABJ designated) - 100 Ω Resistor - P/N 04294-61001 - Power Cable (country-dependent) ## Product Core & Specifications Category Specification Value Measurement Parameters Impedance Parameters Available |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 Measurement Terminal Configuration Type Four-terminal pair configuration Connector Type Type Four BNC (female) connectors. Can be converted to one port terminal using the Agilent 42942A Terminal Adapter (7-mm port) or 42941A Impedance Probe (3.5-mm port). Source Characteristics — Frequency Range 40 Hz to 110 MHz Resolution 1 mHz Accuracy (without Option 4294A-1D5) ±20 ppm (at 23 ±5 °C); ±40 ppm (at 0 to 55 °C) Accuracy (with Option 4294A-1D5) ±0.13 ppm (at 0 to 55 °C) Voltage Signal Level Range 5 mVrms to 1 Vrms Resolution 1 mV Accuracy (4294A four-terminal pair or 42942A 7-mm port) ±\[(10 + 0.05 × f)% + 1 mV\] (at 23 ±5 °C) Accuracy (42941A, 16048G/H measurement port) ±\[(15 + 0.1 × f)% + 1 mV\] (at 23 ±5 °C) Current Signal Level Range 200 µArms to 20 mArms Resolution 20 µA Output Impedance Output impedance 25 Ω (nominal) DC Bias Function DC voltage bias range 0 to ±40 V DC voltage bias resolution 1 mV DC current bias range 0 to ±100 mA DC current bias resolution 40 µA Sweep Characteristics Sweep parameters Frequency, Signal voltage, Signal current, DC bias voltage, DC bias current Sweep type Linear, Log, List, Zero-span, Manual Sweep direction Up sweep, Down sweep Number of measurement points 2 to 801 points List Sweep — number of segments 1 to 18 Delay time range 0 sec to 30 sec, 1 msec resolution Trigger Function Trigger type Continuous, Single, Number of groups Trigger source Internal (Free run), External (BNC connector input), GPIB or LAN, Manual (Front key) Trigger event type Point trigger, Sweep trigger Measurement Bandwidth / Averaging Measurement bandwidth 1 (Fast) to 5 (Precise), 5 steps Averaging type Sweep-to-sweep averaging, Point averaging Averaging factor 1 to 256 (integer) Calibration User calibration Calibration performed with user-defined calibration kit (OPEN, SHORT, LOAD) Port extension Compensation when measurement terminal is extended from 7-mm (42942A) or 3.5-mm (42941A) connector Fixture compensation OPEN, SHORT, LOAD at device contacts of test fixture Display Size / Type 8.4 inch color LCD (TFT) Number of pixels 640 × 480 (VGA) Data / Memory traces 2 data traces (A, B); 2 memory traces (A, B) Equivalent Circuit Analysis Circuit model 3 component model (4 models), 4 component model (1 model) Analysis type Equivalent circuit parameters calculation, Frequency characteristics simulation Mass Storage Flexible disk drive 3.5 inch, Built-in, 1.44 MB, DOS format Volatile memory disk 512 KB Non-volatile memory disk (Flash) 10 MB Interfaces GPIB IEEE 488.1-1987, IEEE 488.2-1987, IEC 625, JIS C 1901-1987 LAN 10 Base-T Ethertwist, RJ45 connector, TCP/IP, Telnet, FTP Printer Parallel Port IEEE 1284 Centronics, HP PCL3, 25 pin D-SUB Keyboard PS/2 style 101 English, Mini-DIN connector 8 Bit I/O Port 15 pin D-SUB, TTL, 4 bit input / 8 bit output 24 Bit I/O Port (Handler Interface) 36 pin D-SUB, TTL External Reference Input 10 MHz ±10 ppm, –5 dBm to +5 dBm, 50 Ω, BNC (female) Internal Reference Output 10 MHz, 0 dBm, 50 Ω, BNC (female) External Trigger Input TTL, pulse width ≥2 µs, BNC (female) External Monitor Output D-SUB 15 pin HD, 640 × 480 (VGA) Operating Conditions Temperature (disk drive operating) 10 °C to 40 °C Temperature (disk drive non-operating) 0 °C to 40 °C Humidity (operating) 15% to 80% RH (wet bulb ≤29 °C, no condensation) Altitude 0 m to 2,000 m **Important:** Maximum DC bias is 0 to ±40 V at currents up to ±20 mA, derating to ±25 V from ±20 mA up to the ±100 mA maximum (see datasheet Figure 1). Test signal level should be ≤0.5 Vrms when measured impedance is ≤50 Ω, and ≤20 mArms when measured impedance is ≤50 Ω.**Important:** Warm-up time must be greater than or equal to 30 minutes after power on for all specifications.**Important:** Specifications describe warranted performance over 0 °C to 40 °C; supplemental performance characteristics (SPC, typical, or nominal) are non-warranted.**Important:** Measurement accuracy applies when adapter setup is performed at 23 ±5 °C. When adapter setup is performed beyond 23 ±5 °C, measurement accuracy is twice as bad as described.**Important:** Test signal level should be ≤0.5 Vrms when measured impedance is ≤50 Ω. Beyond 23 ±5 °C, test signal level setting accuracy is twice as bad as described.**Important:** A test fixture, terminal adapter, impedance probe, or four-terminal pair test leads (e.g., 16047E, 42941A, 42942A, 16048G, 16048H) must be selected and ordered separately for connection to the device under test; the base unit's four BNC (female) connectors are not directly usable for most measurements without one of these accessories.Recommended pairing: the 42942A Terminal Adapter converts the four-terminal pair port to a 7 mm one-port interface, and the 42941A Impedance Probe extends measurement to a 3.5 mm port for in-circuit and fixtureless probing. Option 4294A-1D5 provides a high-stability frequency reference (±0.13 ppm 0–55 °C) when timebase accuracy is critical. ## About this used unit - Warranty included - Functional verification included - Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data. - Note that unnecessary accessories may not be included (contact Test Architect to confirm). **Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.** ## Details - **Price:** 0.0 USD - 980.0 USD - **Vendor:** Agilent - **Type:** Impedance Analyzer - **Tags:** Agilent, Agilent Keysight, Analyzers, Impedance, Manufacturers, product_manual_group_1, Product_used ## Variants | Variant | Price | Available | |---------|-------|-----------| | None | 0.00 USD | In stock | | NIST Traceable | 560.00 USD | In stock | | NIST Traceable with Full Data | 770.00 USD | In stock | | ISO IEC 17025 Accredited | 980.00 USD | In stock | ## Images - 4294A Agilent Impedance Analyzer --- > Source: [ValueTronics](https://valuetronics.com/products/4294a-agilent-impedance-analyzer-used) > Updated: 2026-05-30