1021 DC Current Source and Calibrator

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1021 DC Current Source and Calibrator

The 1021 is a precision DC current calibrator suitable for sourcing applications from micro-amp levels up to 100 mA. Three output ranges are available; 0 to 99.99 mA in 10 μA steps, 0 to 9.999 mA in 1 μA steps, and 0 to 999.9 μA in 0.1 μA steps. Output voltage is adjustable between 14 and 40 volts, with a maximum output power of 2.4 watts.

High accuracy and long term stability make the 1021 suitable for a wide range of testing workload. In process applications it can be used to calibrate and verify current sensitive transducers and their associated indicating and recording devices. For the semiconductor industry the unit can be used as a constant current source for parameter measurements. It can also be used to measure DC current accurately by using the null facility to back off the unknown current. Resolution of 1 μA is possible.

Operation of the 1021 is fast and simple operation. The user needs to only to switch on, check the battery condition, select the range, and set the required current using the thumbwheel switches. Useful features include an LED voltage limit indicator, that shows when the 1021 is unable to supply sufficient drive voltage to maintain the set output current. The instrument is also short circuit and overload protected.


  • 0 to 100 mA output in 3 ranges
  • Accuracy 0.02 %
  • 25 ppm/hr stability
  • Up to 40 V output drive
  • Short circuit and overload protected
  • Safety terminals
  • Removable protective cover
  • Supplied with rechargeable batteries
  • 10 hours typical use between charges
  • Optional carry case
1021 Safety Terminals

Safety Terminals

The instrument connections are via safety terminals that are compatible with standard plugs, 4 mm shrouded plugs, bare wires, and spade terminals.

These terminals are specifically designed with safety features including limited opening distance and a raised flange around the metal connection surface. This ensures that the clearances are sufficient to make the exposed metal parts touch-proof.

1077 Protective Rubber Boot

Added Protection

The 1021 comes fitted with an ergonomic rubber cover providing increased protection and durability. It has a textured grip for comfortable handling and side openings to place labels.

It is easy to remove if the user prefers a stand-alone unit or to house the 1021 in the optional 9027 carry case.

1021 Applications

Resistance and Temperature Measurement
Low ohm and contact resistance of relays, switches, connectors, etc can be easily measured using the 1021 as the current source in a 4-terminal kelvin system where lead and probe resistance do not affect the accuracy of the reading. This method can also be used in thermometry for calibration and measurement of platinum-resistance thermometers and thermistors.

Semiconductor Parameters
The 1021 covers many applications in a variety of semiconductor measurements including; forward voltage drops, zener diode characteristics and temperature coefficients, transistor gains (hFE) and saturation voltages. Characteristic curves of devices can be easily plotted by selecting suitable output currents on the 1021. It can also be used to drive Hall effect devices.


Technical Specification
General Specification


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1021 DC Current Source and Calibrator

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