# Agilent 4291B RF Impedance/Material Analyzer (Pre-Owned)

# Agilent 4291B RF Impedance/Material Analyzer (Pre-Owned)

## Key Features At A Glance

-   Operating frequency from 1 MHz to 1.8 GHz with 1 mHz frequency resolution
-   Measures impedance parameters including |Z|, |Y|, R, X, G, B, Cp, Cs, Lp, Ls, Rp, Rs, D, Q, and reflection parameters
-   OSC level voltage range 0.2 mVrms to 1 Vrms (1 MHz–1 GHz); 0.2 mVrms to 0.5 Vrms (1–1.8 GHz)
-   Open/Short/50 Ω calibration plus optional low-loss capacitor calibration for enhanced D/Q accuracy
-   Up to 801 measurement points with linear, log, zero-span, and list sweep types
-   APC-7 test port with 50 Ω nominal output impedance and interchangeable test heads
-   GPIB (IEEE 488.2) and Centronics parallel port standard for automated test integration
-   8.4-inch color TFT display with dual-channel format and up to 16 memory traces per channel

The Agilent 4291B is an RF Impedance/Material Analyzer covering 1 MHz to 1.8 GHz with 1 mHz frequency resolution. The instrument measures a comprehensive set of impedance parameters — |Z|, θz, |Y|, θy, R, X, G, B, Cp, Cs, Lp, Ls, Rp, Rs, D, Q, |Γ|, θy, Γx, Γy — at the tip of an APC-7 connector mounted on the test head connected to the mainframe. Specifications are warranted over 0°C to 40°C following a 30-minute warm-up.

The 4291B serves RF component characterization and material measurement applications. With Option 002 Material Measurement, the analyzer measures dielectric permittivity parameters (|εr|, εr', εr", tanδ) using the Agilent 16453A fixture and magnetic permeability parameters (|µr|, µr', µr", tanδ) using the Agilent 16454A fixture, both over a typical 1 MHz to 1 GHz range. High Temperature Test Head options (013 and 014) extend test head operating temperature from –55°C to +200°C for environmental characterization of RF components and materials.

ValueTronics International, LLC stocks, inspects, and tests instruments such as the Agilent 4291B at our 20,000 sq ft secure warehouse at 1675 Cambridge Drive, Elgin, Illinois. Our in-house technical team has handled RF impedance analyzers, material measurement systems, and the associated APC-7 calibration kits and test heads for decades, and every {{CONDITION}} unit is verified before it ships. Unlike drop-shippers or pass-through brokers, we physically have the instrument and can answer specific questions about its configuration, included accessories, and operational status before you commit to purchase.

## Brand Heritage

Hewlett-Packard's test & measurement business was spun out as Agilent Technologies in 1999, and the electronic measurement portfolio was subsequently transferred to Keysight Technologies in 2014. Instruments originally produced under the Agilent brand, including the 4291B, are part of that lineage.

## Accessories Supplied

-   Operating Manual (04291-90020)
-   Programming Manual (04291-90027)
-   Program Disk Set (04291-18000)
-   Power Cable
-   50 Ω Termination (04291-65006)
-   0 Ω Termination (04191-85300)
-   0 S Termination (04191-85302)
-   Low-Loss Capacitor (04291-60042)
-   Calibration Kit Carrying Case (04291-60041)
-   APC-7 End Cap (16190-25011)
-   Pad (04291-09001)
-   Mini-DIN Keyboard (C3757-60401)
-   Instrument BASIC User's Handbook (E2083-90000)

## Product Core & Specifications

Specification

Value

Measurement Parameters

Impedance parameters

|Z|, θz, |Y|, θy, R, X, G, B, Cp, Cs, Lp, Ls, Rp, Rs, D, Q, |Γ|, θy, Γx, Γy

Frequency Characteristics

Operating frequency

1 MHz to 1.8 GHz

Frequency resolution

1 mHz

Frequency reference accuracy @ 23±5°C

< ±10 ppm

Source Characteristics — OSC Level

Voltage range @ 1 MHz ≤ Frequency ≤ 1 GHz (terminal open)

0.2 mVrms to 1 Vrms

Voltage range @ 1 GHz < Frequency ≤ 1.8 GHz (terminal open)

0.2 mVrms to 0.5 Vrms

Current range @ 1 MHz ≤ Frequency ≤ 1 GHz (terminal shorted)

4 µArms to 20 mArms

Current range @ 1 GHz < Frequency ≤ 1.8 GHz (terminal shorted)

4 µArms to 10 mArms

Power range @ 1 MHz ≤ Frequency ≤ 1 GHz (terminating with 50 Ω)

−67 dBm to 7 dBm

Power range @ 1 GHz < Frequency ≤ 1.8 GHz (terminating with 50 Ω)

−67 dBm to 1 dBm

AC power resolution

0.1 dBm

Connector

APC-7

Output impedance

50 Ω (Nominal)

Sweep Characteristics

Sweep parameters

Frequency, OSC level (voltage), DC bias voltage/current

Sweep setup

Start Stop, or Center Span

Frequency sweep type

Linear, Log, Zero-span, List

Other sweep types

Linear, Log, Zero-span

Sweep mode

Continuous, Single, Manual, Number of groups

Number of measurement points

2 to 801 points

Averaging

Sweep average, Point average

Delay time

Point delay time, Sweep delay time

Measurement circuit mode

Series circuit mode, parallel circuit mode

Calibration/Compensation

Calibration function

Open/Short/50 Ω calibration, Low loss calibration

Compensation function

Open/Short/Load compensation, Port extension, Electric length

Measurement Accuracy

|Z|, |Y| Accuracy

±(Ea + Eb) \[%\]

Ea @ 1 MHz ≤ Frequency ≤ 100 MHz

0.6

Ea @ 100 MHz < Frequency ≤ 500 MHz

0.8

Ea @ 500 MHz < Frequency ≤ 1000 MHz

1.2

Ea @ 1000 MHz < Frequency ≤ 1800 MHz

2.0

Display

LCD type/size

Color TFT, 8.4 inch

Resolution

640 × 480

Effective Display Area

160 mm × 115 mm (600 × 430 dots)

Number of display channels

2

Format

single, dual split or overwrite, graphic, and tabular

Traces for measurement

1 trace/channel

Traces for memory

16 traces/channel (maximum)

Data Storage

Type

floppy disk drive, Volatile memory disk

Floppy disk capacity

720 kB/1.44 MB

Volatile memory disk (flash backed)

448 kB (maximum)

Disk format

LIF, DOS

GPIB

Interface

IEEE 488.1-1987, IEC625

Protocol

IEEE 488.2-1987

Printer Parallel Port

Interface

IEEE 1284 Centronics standard compliant

Printer control language

HP PCL3 Printer Control Language

Connector

D-sub (25-pin)

External I/O

External reference input frequency

10 MHz ±100 Hz (typically)

External reference input level

\> −6 dBm (typically)

External reference input impedance

50 Ω (nominal)

Internal reference output frequency

10 MHz (nominal)

Internal reference output level

2 dBm (typically)

External trigger input level

TTL Level

External trigger pulse width

\> 2 µs (typically)

External monitor output connector

D-sub (15-pin HD)

External monitor display resolution

640 × 480 VGA

I/O port

4 bit in / 8 bit out port, TTL Level

Operation Conditions

Operating temperature (Disk drive operating)

10°C to 40°C

Operating temperature (Disk drive non-operating)

0°C to 40°C

Operating humidity (Disk drive operating)

15% to 80% RH (wet bulb < 29°C)

Operating humidity (Disk drive non-operating)

15% to 95% RH (wet bulb < 29°C)

Operating altitude

0 to 2,000 meters

Warm-up time

30 minutes

Non-operation temperature

−20°C to 60°C

Non-operation humidity

15% to 95% RH (wet bulb < 45°C)

Non-operation altitude

0 to 4,572 meters

Compliance & Power

EMC

Complies with CISPR 11 (1990) / EN 55011 (1991): Group 1, Class A; IEC 1000-3-2 (1995) / EN 61000-3-2 (1995); IEC 1000-3-3 (1994) / EN 61000-3-3 (1995); IEC 1000-4-2 (1995) / EN 50082-1 (1992): 4 kV CD, 8 kV AD; IEC 1000-4-2 (1995) / EN 50082-1 (1992): 3 V/m; IEC 1000-4-4 (1995) / EN 50082-1 (1992): 1 kV / Main, 0.5 kV / Signal Line

Safety

Complies with IEC 1010-1 (1990), Amendment 1 (1992) and Amendment 2 (1995); CSA-C22.2 No. 1010.1-92

Power requirements

90V to 132V, or 198V to 264V (automatically switched), 47 to 63 Hz, 300VA max

Physical

Mainframe weight

21.5 kg (SPC)

Test Station weight

3.7 kg

Mainframe dimensions

425 (W) × 235 (H) × 553 (D) mm

Test Station dimensions

275 (W) × 95 (H) × 205 (D) mm

**Important:** Specifications are defined at the tip of the APC-7 connector on the test head connected to the instrument. Warm-up time must be greater than or equal to 30 minutes after power on for all specifications.**Important:** Discontinued Product Information — For Support Reference Only. Information herein may refer to products/services no longer supported.**Important:** Specifications of the stimulus characteristics and measurement accuracy are defined at the tip of the APC-7 connector on the test head connected to the instrument.**Important:** Warm-up time must be greater than or equal to 30 minutes after power on for all specifications.**Important:** At the following frequency points, instrument spurious characteristics could occasionally cause measurement errors to exceed specified value: 10.71 MHz, 17.24 MHz, 21.42 MHz, 42.84 MHz, 514.645 MHz, 686.19333 MHz, 1029.29 MHz, 1327.38666 MHz.**Important:** For Option 013/014 High Temperature Test Heads: bending cable should be smooth and the bending angle less than 30°; cable position should be kept in the same position after calibration measurement; the cable must be at the same temperature as the main frame at least 15 cm from the test station.**Important:** For Option 002 Material Measurement, the appropriate test fixture must be ordered separately: use the Agilent 16453A for dielectric (permittivity) measurement with the High-Z Test Head, or the Agilent 16454A for magnetic (permeability) measurement with the Low-Z Test Head.Usage tip: Option 002 Material Measurement is paired with the Agilent 16453A dielectric material test fixture for permittivity measurements (typical 1 MHz to 1 GHz) and the Agilent 16454A magnetic material test fixture for permeability measurements, as specified in this datasheet.

## 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
- **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 | 0.00 USD | In stock |
| NIST Traceable with Full Data | 0.00 USD | In stock |
| ISO IEC 17025 Accredited | 0.00 USD | In stock |

## Images

- Agilent 4291B RF Impedance/Material Analyzer (Pre-Owned)

---

> Source: [ValueTronics](https://valuetronics.com/products/4291b-agilent-impedance-analyzer-used)
> Updated: 2026-05-30