HP / Agilent 54721A 1.1 GHz Amplifier Plug-in for HP 54720D

The HP/Agilent 54721A is a 1.1 GHz amplifier plug-in module for the HP 54720D digitizing oscilloscope mainframe. This single-channel vertical amplifier extends measurement bandwidth to 1.1 GHz, enabling precise capture and analysis of high-frequency signals with a maximum sample rate of 4 GSa/s. The module delivers 10 mV/div maximum sensitivity with software expansion to 1 mV/div, supporting single-shot measurements up to 1 GHz and internal/external triggering up to 1 GHz. The 54721A occupies two mainframe slots and provides 32K memory depth on ‘A’ model mainframes or 128K on ‘D’ model mainframes.

## Technical Specifications

• **Bandwidth:** 1.1 GHz
• **Sample Rate:** 4 GSa/s (with HP 54720D mainframe)
• **Channels:** 1
• **Input Impedance:** 50 Ω
• **Sensitivity:** 10 mV/div maximum; software-expandable to 1 mV/div
• **Single-Shot Capability:** 1 GHz
• **Trigger Frequency:** Internal and external up to 1 GHz
• **Memory Depth:** 32K (‘A’ model mainframes) / 128K (‘D’ model mainframes)
• **Maximum Input Voltage:** 5 Vpk-pk; ±50 Vac maximum
• **Calibration Output Pulse Width:** Approximately 500 ps

## Key Features

• N-type (female) connectors for channel input and external trigger
• Two channel output connectors supporting interleaved sampler hybrids
• Trigger outputs on rear panel for both internal and external signals
• Two probe power connectors compatible with HP 54700-series active probes
• Digital interface connector for attenuator control, channel setup, softkey selection, and power delivery
• Digital offset feature with ±12× full resolution channel scale range
• Best accuracy calibration protocol for 1% DC accuracy—slot-specific and time-sensitive
• Automatic probe attenuation when active probes are connected; manual configuration for other probes
• Can serve as trigger source independent of channel display status

## Typical Applications

High-frequency signal capture and analysis. Single-shot measurements of transient events. Applications requiring accurate waveform characterization at GHz-class frequencies.

## Compatibility & Integration

Designed for HP 54720D and HP 54710 mainframes. Compatible with HP 54700-series active probes.