The Keysight (Agilent/HP) 41800A is a high-performance active probe operating from 5 Hz to 500 MHz. It provides high input impedance and extremely low input capacitance to enable in-circuit measurements with negligible loading, making it ideal for signal analysis in audio, video, HF, and VHF bands with spectrum and network analyzers.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | 50 Ohm Type-N male RF connector, standard HP 4-pin probe power connector |
| Included Accessories | 10:1 divider, 100:1 divider, BNC adapter, discrete hook tip, ground leads, spare tips, carrying case |
Physical
| Parameter | Value |
|---|---|
| Power Supply | +15 V and -12.6 V supplied via probe power port |
| Operating Temperature | 0 °C to 55 °C |
| Weight | 0.3 kg |
| Cable Length | 1.2 m |
RF & Electrical Performance
| Parameter | Value |
|---|---|
| Frequency Range | 5 Hz to 500 MHz |
| Probe Gain | 0 dB |
| Input Resistance (Probe Alone) | 100 kOhm (typical) |
| Input Capacitance (Probe Alone) | 3 pF (typical) |
| Input Resistance (With 10:1 or 100:1 Divider) | 1 MOhm (typical) |
| Input Capacitance (With 10:1 or 100:1 Divider) | 1 pF (typical) |
| Frequency Response (<50 Hz) | +-2 dB (relative to 50 MHz) |
| Frequency Response (50 Hz to 200 MHz) | +-1 dB (relative to 50 MHz) |
| Frequency Response (>200 MHz) | +1.5 / -2 dB (relative to 50 MHz) |
| Second Harmonic Distortion | <-50 dBc @ -20 dBm (250 MHz) input (typical) |
| Third-Order Intermodulation Distortion | <-70 dBc @ -26 dBm two-signal input (400 MHz, 400.5 MHz) (typical) |
| 1 dB Gain Compression | >+3 dBm input @ 500 MHz |
| Maximum Allowable Input Voltage (AC+DC, Probe Alone) | +-40 V |
| Maximum Allowable AC Input (Probe Alone) | 0.5 Vrms |
| Maximum Allowable AC Input (With 10:1 Divider) | 5 Vrms |
| Maximum Allowable AC Input (With 100:1 Divider) | 30 Vrms |
| Output Impedance | 50 Ohm (nominal) |
Physical & Mechanical Characteristics
| Parameter | Value |
|---|---|
| Output Connector | 50 Ohm Type-N male |
| Protection Feature | Retractable metal sleeve protects probe tip from physical and ESD damage |
Power Requirements
| Parameter | Value |
|---|---|
| Instrument Interface Compatibility | Keysight, Agilent, and HP spectrum and network analyzers with probe power outlets |
| External Power Option | Compatible with Keysight 11899A probe power supply |
Environmental Specifications
| Parameter | Value |
|---|---|
| Storage Temperature Range | -40 °C to +70 °C |
Environmental
| Parameter | Value |
|---|---|
| Operating Humidity | ≤ 95% RH (at 40 °C) |
Applications
RF and Microwave In-Circuit Signal Analysis