ESI / Tegam DT72A

Decade Ratio Transformer Standard

The ESI DT72A is an inductive voltage divider designed for precision voltage ratio measurement and calibration. It provides a ratio range from −0.0111111 to +1.111111 with a resolution of 0.1 ppm.
It operates over a frequency range of 50 Hz to 20 kHz with terminal linearity of ±0.9 ppm at 1 kHz.
The instrument supports a maximum input voltage of 350 V or 0.35f with an output current up to 1 A.

Product Info Related Products

Ratio Range	−0.0111111 - +1.1111110
Resolution	0.1 ppm (0.00001%)
Terminal Linearity	±0.9 ppm at 50 Hz - 1 kHz for 0.1 - 1.0 settings
Frequency Range	50 Hz - 20,000 Hz
Maximum Input Voltage	0.35f or 350 V rms whichever is less
Maximum Output Current	1 A
Maximum Phase Shift	0.05 mrad per kHz above 0.1 setting
Input Impedance	500 kΩ minimum at 20 V and 400 Hz
Input Inductance	100 H - 400 H
Output Impedance	30 µH inductance and approximately 5 Ω series resistance
DC Input Limit	20 µA reduces rating about 10% and 200 µA causes saturation
Dimensions	48.3 cm width 13.3 cm height 18 cm depth
Weight	8.1 kg