The Valhalla 2500EN is a high-performance AC/DC current calibrator engineered to translate precise input voltages into proportional output currents with exceptional accuracy and stability. This transconductance amplifier maintains consistent amplitude, frequency, and phase characteristics across demanding test and measurement applications. The 2500EN model features 10 MΩ input impedance and accepts input voltages up to 30V peak AC/DC—double the standard range—making it ideal for complex laboratory and industrial calibration systems.
Technical Specifications
Performance and Accuracy
• DC accuracy: ±0.01% of output + 0.01% of range (up to 500 Hz)
• AC accuracy (up to 500 Hz): ±0.05% of output + 0.05% of range
• Stability: ±0.0005% per 15 minutes; ±0.005% over 24 hours
• Temperature coefficient: ±0.001% of output ±0.002% of range per °C outside 20–30°C (doubled for AC)
• Warm-up time: Approximately 1.5 hours to stable operation
Electrical Characteristics
• Maximum output current: 12 A DC or RMS AC
• Input impedance: 10 MΩ
• Output capacitance: 500 pF
• Compliance voltage: 10V peak (reduces to 7V peak at 10A RMS); 10V DC or peak AC
• Input voltage range (2500EN): 30V peak AC/DC
• Dynamic range: 0–200% of rated output
• Common mode rejection ratio: 60 dB at DC, decreasing to 40 dB at maximum frequency
• Maximum isolation voltage: ±200V DC or peak AC
• Output protection: 15 A fuse maximum
Physical & Environmental
• Dimensions: 15″ × 17″ × 5.25″ (381 mm × 432 mm × 133 mm)
• Weight: 30 lbs (14 kg) net; 40 lbs (18 kg) shipped
• Operating temperature: 0–50°C
• Storage temperature: -40–70°C
• Humidity: 70% RH maximum (non-condensing at 45°C)
• Power: 115/230 VAC ±10%, 50–60 Hz (5A/115VAC fuse; 3A/230VAC fuse)
– Key Features
• Input-to-output ratio of 2.00000 V provides full-scale output on 2500EN
• Extended input voltage acceptance enables integration with varied signal sources
• High input impedance minimizes loading effects on source circuits
• Fuse-protected outputs rated to 15 A maximum
– Typical Applications
Precision current generation for calibration of ammeters, power meters, clamp meters, and current-sensing instruments across DC and AC frequencies to 500 Hz.
