# Agilent 41800A Active Probe, 5 Hz to 500 MHz (Pre-Owned)

# Agilent 41800A Active Probe, 5 Hz to 500 MHz (Pre-Owned)

## Key Features At A Glance

-   Frequency coverage from 5 Hz to 500 MHz for audio, video, HF, and VHF circuit signal analysis
-   High input impedance with low input capacitance (100 kΩ, 3 pF probe alone) for negligible circuit loading during in-circuit probing
-   0 dB ±0.5 dB probe gain at 50 MHz with ±1 dB frequency response from 50 Hz to 200 MHz (relative to 50 MHz)
-   Average noise level of 10 nV/√Hz at ≥300 kHz (typical) for low-noise signal capture
-   Retractable metal sleeve protects the probe tip from physical damage and ESD when not in use
-   Compatible with network and spectrum analyzers for gain, phase, group-delay, harmonic, spurious, and noise measurements
-   Ships with 10:1 and 100:1 divider accessories, hook tip, ground lead, spare probe tips, BNC adapter, and carrying case
-   Maximum allowable input of ±40 V (DC + AC) with 50 Ω type-N male output connector

The Agilent 41800A is an active probe covering 5 Hz to 500 MHz, designed to provide reliable in-circuit signal analysis when paired with a network or spectrum analyzer. The probe combines high input impedance with low input capacitance to enable measurements with negligible loading of the circuit under test, making it suitable for precise probing at the circuit level across audio, video, HF, and VHF frequency bands.

The 41800A supports two primary application areas as described by the manufacturer. When used with a spectrum analyzer, it evaluates circuit quality through measurements of spurious level, harmonics, and noise. When used with a network analyzer, it enables gain, phase, and group-delay measurements at the circuit level. These pairings make the probe a tool for both signal-quality characterization and frequency-response analysis on assembled circuits and prototypes.

## Brand Heritage

Hewlett-Packard's test and measurement business was spun out as Agilent Technologies in 1999, and Agilent's electronic measurement business was then transferred to Keysight Technologies in 2014. The 41800A active probe was originally released under the Agilent brand and remains supported through the Keysight successor organization for the categories where service continues.

## Accessories Supplied

-   Type BNC male adapter
-   10:1 divider
-   100:1 divider
-   Hook tip
-   2.5 inch ground lead
-   30 mil spare probe tips
-   12 mil spare probe tips
-   Spanner tip assembly
-   Probe tip nut driver
-   Operating note
-   Carrying case

## Product Core & Specifications

Specification

Value

Bandwidth

5 Hz to 500 MHz

Probe gain

0 dB ± 0.5 dB @ 50 MHz

Input R, C (typical)

100 kΩ, 3 pF (probe alone); 1 MΩ, 1 pF (with 10:1, 100:1 divider)

Frequency response relative to 50 MHz

+1/-2 dB @ < 50 Hz; ±1 dB @ 50 Hz to 200 MHz; +1.5/-2 dB @ > 200 MHz

Average noise level (typical)

10 nV/√Hz @ ≥ 300 kHz; +3 dB/Oct @ < 300 kHz

2nd harmonic distortion (typical)

< -50 dBc @ -20 dBm (250 MHz) input

3rd order intermodulation distortion (typical)

< -70 dBc @ -26 dBm two signals input (400 MHz, 400.5 MHz)

1 dB gain compression

\> +3 dBm input @ 500 MHz

Maximum allowable input (DC + AC)

±40 V

Output connector

50 Ω type-N male

Power

+15 V/85 mA, -12.6 V/65 mA

Weight

0.3 kg (probe alone); 2 kg (including accessories)

Length

Approximately 1.2 m

Operating temperature / humidity

0 °C to 55 °C, RH ≤ 95% (40 °C)

**Important:** Requires Agilent 11899A Probe Power Supply (or a network/spectrum analyzer with compatible front-panel probe power) for operation. Maximum allowable input: ±40 V (DC + AC).**Important:** The 41800A is directly compatible with Agilent network and spectrum analyzers that supply probe power from the front panel, including the 4395A, 4396B (Network/Spectrum/Impedance Analyzer), 8590 Series (Spectrum Analyzer), and E5100A (Network Analyzer). For analyzers without a compatible front-panel probe power supply, the Agilent 11899A probe power supply is required and must be ordered separately.**Important:** Specifications are terminated with Agilent part number 11880-60001 type-N adapter.Recommended pairing: the 41800A is directly compatible with the Agilent 4395A and 4396B network/spectrum/impedance analyzers, the Agilent 8590 Series spectrum analyzers, and the Agilent E5100A network analyzer, all of which supply probe power from the front panel per the datasheet's compatibility table.

## 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 - 210.0 USD
- **Vendor:** Agilent
- **Type:** Act Prob
- **Tags:** Active, Agilent, Agilent Keysight, Manufacturers, Other Equipment, Probe, product_manual_group_1, Product_used

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| None | 0.00 USD | In stock |
| NIST Traceable | 105.00 USD | In stock |
| NIST Traceable with Full Data | 140.00 USD | In stock |
| ISO IEC 17025 Accredited | 210.00 USD | In stock |

## Images

- Agilent 41800A Active Probe, 5 Hz to 500 MHz (Pre-Owned)

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> Source: [ValueTronics](https://valuetronics.com/products/41800a-agilent-active-probe-used)
> Updated: 2026-05-30