The DRS20 is a dual-channel reference source offering ultra high precision and stability and provides a +/-10 V output. The output current can be up to 10 mA and the 4 wire connection provides a 1 µV/mA load regulation. The high precision and stability is achieved by using a temperature controlled voltage reference. All internal nodes are calibrated using a built in 24-bit precision DVM that continuously checks the internal nodes relative to this reference. Therefore the accuracy is only determined by the temperature controlled voltage reference. This ensures a negligible drift when sourcing over a long period of time. The same DVM can be used to measure external voltages with extremely high precision.
The output has a very low noise level. Special attention has been paid to low frequent noise (<10 Hz) since this is very difficult to filter away afterwards. The unit is very suitable as the reference source for data converter testing.

Block Diagram

Key Features

  • Ultra High precision DC source
  • Dual channel
  • 20 bit resolution
  • +/-10 V output swing
  • +/-10 mA max. current,1 µV/mA load regulation
  • 2 ppm Linearity
  • 5 µVrms wide band output noise (DC-100 kHz)
  • High precision voltage measure capability
  • For ATX series hardware platform

Technical Specifications


Channels 2
Resolution 20 bit
Output range -10 V to +10 V
full accuracy output current 10 mA
Maximum Output current 30 mA typical
Output configuration 2 or 4-wire
Settling time for full accuracy 20 ms (*)

(*) The settling time is programmable to allow a trade-off between settling time and accuracy.


Accuracy ±(25 µV + 10 ppm of Value)
Linearity (typical) 2 ppm
Temperature drift (typical) ±(2 µV + 1 ppm of value)/ºC
Load regulation (typical) 1 µV/mA
Output noise (typical) 5 µVrms (DC to 100 kHz)
0.1 Hz to 10 Hz noise (typical) 4 µVpp
Voltage measure resolution 2.7 µV

Calibration output

Connector style SMB
Output voltage 7.2 V