• DC accuracy class up to 0.01; AC accuracy class up to 0.05
• DC voltage output: ±(10 mV ~ 1100 V); DC current output: ±(3 μA ~ 22 A) (33 A optional)
• AC voltage output: 3 mV ~ 1100 V; AC current output: 30 μA ~ 22 A (33 A optional); 45 Hz ~ 1500 Hz
• Simulated DC resistance: 0 Ω ~ 220 MΩ, 2-terminal and 4-terminal wiring
• DC voltage stability up to 0.005%/24h; DC current stability up to 0.01%/24h
• 2 MHz square wave frequency output; phase output; AC/DC power output
• Options: remote adjustment box, clamp meter calibration, transducer calibration

• Calibration of 4.5 digit multimeters
• Calibration of voltmeters, ammeters, ohmmeters, and frequency meters
• Calibration of power meters, phase meters, and power factor meters
• AC/DC transducer ratio error calibration (option)
• DC clamp meter calibration (option)

• DC voltage 1-year accuracy ±(ppm*output + μV), (23±5) °C: 100 mV: 80 + 10; 300 mV: 80 + 10; 1 V: 80 + 15; 3 V: 80 + 15; 10 V: 80 + 150; 30 V: 80 + 150; 100 V: 80 + 1500; 300 V: 80 + 1500; 1000 V: 80 + 5000
• Note: when the output is negative, the floor uncertainty is double
• DC voltage output range: ±(10 mV ~ 1100 V)
• DC current output: ±(3 μA ~ 22 A) (33 A optional)
• AC voltage and current: 3 mV ~ 1100 V, 30 μA ~ 22 A or 33 A, 45 Hz ~ 1500 Hz
• Simulated DC resistance: 0 Ω ~ 220 MΩ
• Frequency output: 1 Hz ~ 2 MHz
• DC small-signal measurement (transducer option): V max 12 V, I max 24 mA
• Power supply: AC (220±22) V, (50±2) Hz; maximum power consumption 600 VA
• Warm up time: twice the time since last warmed up, to a maximum of 30 minutes
• Operating temperature: 0 °C~40 °C; calibration temperature: 18 °C~28 °C; storage temperature: -20 °C~70 °C
• Communication interface: RS232
• Dimensions: 450 mm (W) × 505 mm (D) × 203 mm (H), excluding handles and feet; weight about 19.5 kg
• Full accuracy tables for every function and range are in the datasheet

Utility and industrial labs often calibrate a mix of digital meters, analog panel meters, power meters, and transducers. A source that only covers voltage and current leaves half of that work to other equipment.

The TD1860 integrates AC and DC voltage and current sources with DC accuracy class up to 0.01, simulated resistance with 4-terminal wiring, power and phase outputs, and optional transducer calibration. DC voltage stability reaches 0.005% over 24 hours. Analog meters can be checked scale by scale with the optional remote box, and calibration points can be set as a percentage of range on the touch screen.

For Class 0.05 work at lower cost, see the Tunkia TD1855; for 5.5 digit meters and frequencies up to 500 kHz, the Tunkia TD1870. Compare all models in electrical calibration.

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