HP / Agilent 5300B COUNTER MAINFRAME

The HP/Agilent 5300B Counter Mainframe is a modular measurement platform that provides the core infrastructure for frequency and time interval measurements. It delivers essential system power, a stable 10 MHz reference timebase, an 8-digit LED display, counting logic, and timing control—forming a foundation for configuration with plug-on modules tailored to specific measurement requirements.

## Technical Specifications

**Display**
• 8-digit LED display assembly

**Timebase**
• Frequency: 10 MHz
• Aging rate: <3 × 10⁻⁷ per month
• Temperature stability: <5 × 10⁻⁸ (0°C to 50°C); typically <2 × 10⁻⁶ (15°C to 40°C)
• Line voltage stability: 1 × 10⁻⁷ for ±10% line variation

**Oscillator Output**
• 10 MHz, ~1 Vrms at rear BNC with 100 Ω source impedance

**External Timebase Input**
• Frequency range: 1 MHz to 10 MHz
• Input level: 1 Vrms into 50 Ω
• Requires 10 MHz for correct display operation

**Power**
• Input: 115 to 230 V, +13% to −17%, 48 to 440 Hz
• Consumption: 25 VA maximum (5 W mainframe nominal)

**Environmental**
• Operating temperature: 0°C to 50°C

**Physical**
• Dimensions: 89 mm H × 160 mm W × 248 mm D (with snap-on module)
• Weight: 1.5 kg net; 2.5 kg shipping
• All solid-state construction in hard metal enclosure

## Key Features

• Modular plug-on architecture for customized measurement configurations
• Stable 10 MHz internal reference with tight temperature and aging specifications
• Compact form factor: 3.5" × 6.25" × 9.25"
• Low mainframe power draw enables extended operation
• Three-conductor power cord with earth ground protection

## Typical Applications

Frequency measurement, period analysis, time interval characterization, and ratio-based counting across diverse electronic testing and calibration workflows.

## Compatibility & Integration

The 5300B accepts plug-on counter modules including HP 5301A (10 MHz), 5302A (50 MHz universal), 5305B (1.3 GHz), 5306A (multimeter/6-digit), 5307A (high resolution), 5308A, and 5311B (digital-analog converter). Optional HP 5310 battery pack available.