Ametek / Elgar / California Instruments 850T-3 Precision Oscillator Module

The Ametek / Elgar / California Instruments 850T-3 is a precision oscillator module engineered as a plug-in master oscillator for Invertron® AC Power Sources in the T Series and XP-Series product lines. It generates the drive signal for power amplifiers with crystal-controlled frequency synthesis, delivering stable reference signals across a wide operating range.

Technical Specifications

Frequency Range: 45 Hz to 10 kHz Frequency Resolution:

• X1 Range: 0.01 Hz steps (0.01 Hz to 99.99 Hz)


• X10 Range: 0.1 Hz steps (0.1 Hz to 999.9 Hz)


• X100 Range: 1 Hz steps (1 Hz to 9999 Hz) Frequency Accuracy: 0.001% Frequency Stability: Crystal-controlled synthesized frequency with 5 ppm/°C average stability Phase Configuration: Three-phase output with optional circuit boards available for two-phase or three-phase configurations Phase Accuracy:


• 1° typical (multi-phase)


• 90° ±1° from 45 Hz to 5 kHz; ±2° from 5 kHz to 10 kHz (two-phase)


• 120° ±1° from 45 Hz to 5 kHz; ±2° from 5 kHz to 10 kHz (three-phase Wye, Phase C leading Phase A) Input Power: +25 VDC and −25 VDC at 0.040 A

Key Features

• Front panel amplitude control with optional remote programming via voltage (RPV) or resistance (RPR)


• Low output distortion design


• External synchronization input for frequency and phase angle locking


• Soft-start feature that gradually ramps output amplitude from zero during power-on or post-shutdown recovery


• Automatic frequency limit shutdown to prevent operation outside associated power source specifications


• Programmable waveform option


• Integrated measurement capabilities: output voltage, current, frequency, phase angle, true power, apparent power, and power factor


• Digital phase control maintains constant electrical angles independent of frequency

Typical Applications Precision frequency reference generation for power amplifier systems requiring stable, low-distortion drive signals across industrial and laboratory test environments.

Compatibility & Integration Designed exclusively for integration with Invertron® AC Power Sources (T Series and XP-Series). The module derives operational power from the host system and must be installed as a plug-in component.