Ametek / VTI Instruments / VXI Technology VT1415A Algorithmic Closed Loop Controller

The Ametek VT1415A is a C-size, single-slot VXI algorithmic closed-loop controller designed for precision test, measurement, and process control applications. This register-based A16 slave module executes deterministic control algorithms on dedicated on-board DSP firmware, eliminating drift and jitter in time-critical calculations involving integrals and derivatives. It bridges the gap between standard PID controllers and custom control systems, offering advanced algorithmic capabilities with simplified implementation.

Technical Specifications

Module Architecture

• C-size, single-slot VXI form factor


• Register-based A16 slave device


• On-board DSP firmware with deterministic clock control Control Capabilities


• Eight independent control loops


• Maximum loop update rate: 3 kHz (single loop) / 8 kHz (eight loops) for default PID algorithm


• Basic configuration: up to 1000 Hz per loop update rate


• Loop timing deterministically controlled by internal clock, independent of algorithm execution time


• Pre-written PID algorithms with modification support


• Custom algorithm development from algebraic expressions and flow constructs (IF, THEN, ELSE)


• On-the-fly algorithm and tuning constant updates Data Acquisition


• Multi-function analog and digital input/output


• Analog scanning A/D: ±16 V full-scale with auto-ranging gains (x1, x4, x16, x64, x256)


• Digital capabilities: static state sensing/setting, frequency and period measurement, totalizing, PWM and FM signal input/output


• Double-buffered architecture for continuous scanning and algorithm execution


• Signal Conditioning Plug-on (SCP) module support for input protection and conditioning Performance & Accuracy


• Typical accuracy: ±0.01% of input level (varies with SCP module)


• Drift error: 10 µV/°C ÷ SCP gain per °C change beyond 5-minute warm-up window


• Specifications valid: 90 days, 23 °C ± 1 °C following 1-hour warm-up and calibration


• Single-sample accuracy; multi-sample averaging reduces noise

Key Features

• Deterministic execution prevents drift in integral and derivative calculations


• Flexible algorithm development environment with minimal system complexity


• High loop update rates support demanding real-time control requirements


• Double-buffered architecture ensures continuous operation during algorithm updates

Typical Applications

• Precision closed-loop control systems


• Test and measurement data acquisition


• Process control with multiple simultaneous loops


• Real-time signal conditioning and analysis

Compatibility & Integration Requires Signal Conditioning Plug-on (SCP) modules for signal protection and conditioning. Operates within standard VXI instrument chassis architecture.