HP / Agilent 5335A Universal Counter, 200 MHz

The HP Agilent 5335A is a 200 MHz universal counter delivering precision frequency, time interval, ratio, and pulse measurements across research, development, and manufacturing environments. This instrument combines multi-channel capability with flexible triggering and integrated math/statistics functions to support demanding metrology workflows.

## Technical Specifications

**Measurement Capabilities**
• Frequency: 200 MHz (Channel A), 100 MHz (Channel B), optional 1.3 GHz (Channel C)
• Time Interval: 2 ns single-shot resolution, 100 ps average resolution
• Ratio Measurements: Full function capability
• Totalize: Up to 100 MHz
• Rise/Fall Time: 20 ns to 10 ms range
• Pulse Width: 5 ns to 10⁷ seconds
• Duty Cycle: 10% to 89%
• Slew Rate: 50 V/µs to 10⁸ V/µs
• Phase: Automatic measurement supported
• Math & Statistics: Scale, offset, normalize; averaging and standard deviation with N=100 or N=1000 selection

**Input Characteristics (Channels A & B)**
• Coupling: DC; AC via 1 MΩ or 50 Ω impedance
• Frequency Range: DC-coupled 0–100 MHz; AC 1 MΩ 30 Hz–100 MHz; AC 50 Ω 200 kHz–100 MHz (Channel A extends to 200 MHz in Frequency A and Ratio modes)
• Sensitivity (×1): 25 mV rms sine; 75 mV peak-to-peak pulse (5 ns minimum width)
• Dynamic Range (×1): 75 mV–5 V to 100 MHz; 75 mV–2.5 V above 100 MHz
• Signal Range (×1, DC): −5 V to +5 V
• Input Impedance: 1 MΩ nominal (<35 pF shunt) or switchable 50 Ω
• Attenuator: X1 or X10 switchable

**Triggering**
• Modes: Manual and Automatic
• Manual: ±5 V dc range
• Automatic: Selectable 10–90% rise/fall or 50% phase trigger; DC offset tracking
• Trigger Level DVM: Built-in display for both channels
• Trigger Level Range (×1): Auto OFF −5 V to +5 V (0 V nominal); Auto ON adjustable between signal peaks

## Key Features

• Dual-channel base configuration with optional third channel to 1.3 GHz
• Switchable impedance and coupling for signal adaptation
• Independent manual and automatic trigger control with peak tracking
• Integrated trigger-level monitoring via dedicated DVM
• Statistical analysis with selectable sample sizes

## Typical Applications

• Frequency and timing characterization in RF and digital circuits
• Pulse parameter validation in semiconductor testing
• Phase relationship measurement between signals
• Time-interval analysis in timing systems and synchronization circuits

## Compatibility & Integration

HP-IB interface supported for automatic trigger control and remote operation.