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1021 D.C. Current Source With Null Meter (0.05% Accuracy)

Supplier: TEX Onsite

The 1021 is a precision DC Current Source suitable for calibration and test applications from micro-amp levels up to 100mA.


  • 100mA output in 3 ranges
  • 0.05% accuracy
  • 20ppm/hr stability
  • 1 uV null meter resolution
  • Up to 40V output drive
  • Overload protection
  • Portable with rechargeable batteries and carrying case

The 100mA output with overload protection is based on the popular Time Electronics type 1007 millivolt source and incorporates many of the well-proven features. The instrument is overload protected and a front panel indicator shows when insufficient drive voltage is available. Maximum output voltage is adjustable between 14 volts and 40 volts, with a maximum output power of 2.4 watts.

The unique circuit design ensures that it stays well within specification for at least 12 months. Variation with temperature is better than 60 ppm per ºC, and typically better than 20 ppm per hour at constant temperature. To improve the switch reliability, additional back-up contacts have been used – even if a contact fails, the 1021 will still operate correctly.

The accuracy and stability are such that a wide range of applications are possible. In the process industries it may be used to test and calibrate current sensitive transducers, and their associated indicating and recording instruments. The semiconductor industry requires constant current sources for parameter measurements. It may also be used to measure DC current accurately by using the null facility to back off the unknown current. Resolution of 1µA is possible.

This precision handheld calibrator is one of the Time Electronics comprehensive portable testing equipment line, with multiple capabilities it delivers accuracy and reliability in one instrument.