The HP/Agilent 53151A is a 26.5 GHz CW microwave frequency counter engineered for simultaneous frequency and power measurements across field, factory, and ATE environments. Built on a lightweight, compact platform with optional battery operation, it delivers 1 Hz resolution and integrates a zero-bias Schottky diode sampler with automatic frequency response and square-law deviation compensation.
## Technical Specifications
**Frequency Measurement**
• Channel 1: 10 Hz to 125 MHz
• Channel 2 (Microwave): 50 MHz to 26.5 GHz
• Resolution: 1 Hz to 1 MHz, selectable; maximum 1 Hz
• Timebase: 10 MHz standard; optional oven timebase available
• Aging rate: <3 parts in 10⁶/month (standard)
**Power Measurement**
• Range: 50 MHz to 26.5 GHz on Channel 2
• Sensitivity: +7 dBm minimum
• Display options: dBm or watts
• Functions: Power, Power Offset, Relative Power
**Input Characteristics**
• Channel 1 impedance: 1 MΩ
• Channel 2 impedance: 50 Ω
• Channel 1 maximum: 20 MHz p-p @ 10 MHz rate
• Channel 2 maximum: 1 MHz p-p @ 10 MHz rate
**Measurement & Acquisition**
• Typical acquisition time: 100–140 ms
• Sample rate: User-selectable (Fast, Medium, Slow, Hold)
• Functions: Frequency, Relative Frequency, Frequency Offset, Arbitrary and Nulling Offsets, Measurement Averaging
**Display & Controls**
• Backlit LCD
• SCPI-compatible programming
## Key Features
• Dual-channel architecture—low-frequency and microwave inputs on one platform
• Zero-bias Schottky diode sampling with automatic diode compensation
• 1 Hz frequency resolution across both channels
• Compact footprint: 238 mm W × 98 mm H × 276 mm D; 3.1 kg
• Optional battery operation for field portability
## Typical Applications
Microwave signal characterization, frequency and power verification in RF systems, signal source calibration, and real-time frequency monitoring in production and service environments.
## Compatibility & Integration
• HP-IB (IEEE 488) interface
• RS-232 serial interface
• SCPI command set for automated test systems
