1048 Voltage/Current/Loop Calibrator

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1048 Voltage current loop calibrator (Front)

A portable instrument that operates as a current and voltage source and a multi-purpose loop calibrator. High performance and simple operation make it suitable for R&D, service, process control engineers, and calibration technicians. As a versatile handheld calibrator, the source and measure capabilities with 0.02 % accuracy mean the 1048 is a compact solution for most simulation and test applications.

The 1048 combines the advantages of digital accuracy with analog control. Based on the popular functionality of the 1044 calibrator, the 1048 offers higher voltage and current across the three ranges, and improved accuracy. The additional features of transmitter simulation, sink loop control, output stepping and ramping, and incremental fine adjustment make the instrument ideal for use in the process industry.

The large, easy to read 4.5 digit LCD display shows the actual output, even when the connected load exceeds the specifications. This important feature eliminates the risk of large errors when connecting to unknown loads. The display also indicates if the battery becomes critically low.


  • Source/measure voltage and current
  • 3 source ranges: 0 to 22 mA & 0 to 22 V
  • 3 measure ranges: 0 to 70 mA & 0 to 50 V
  • Accuracy 0.02 %
  • Transmitter simulator/sink loop control
  • Output steps and ramps
  • Fine adjustment
  • 20 hours typical battery life
  • Optional mains power supply
1048 Portable Voltage and Current Calibrator

Functions and Features

In source mode, voltage up to 22 V and current up to 22 mA may be generated in three ranges. In current source mode the 1048 has a high 24 V compliance voltage which is ideal for powering process loops. In the measurement mode, the range and function can be easily selected, with the measured input accurately shown on the display.

The step, ramp, and inching functions are simple operation, with a control knob and up/down incrementing buttons for fine control. The output can be reversed (+/-) and zeroed at the flick of a switch. The automatic ramp function enables the user to choose either 5, 11, or 21 point calibration. Manual operation can be quickly restored by a single push of a button.

1048 Portable Voltage and Current Calibrator

Portable Operation

The 1048 loop calibrator is housed in a pocket sized, ABS case and comes with a leather carry case containing a compartment for storing test leads.

A single 9 V battery powers the unit or an external 12 V DC power supply may be used which disconnects the internal battery.

1048 Safety Terminals

Safety Terminals

The 1048 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.

1048 Applications

Common use of the 1048 is to simulate a transducer or measure the current flow in a transducer loop. As a process calibrator it can be used to check a 4 to 20 mA system in either source or measure modes of operation. The 24 V compliance voltage powering the loop when current source mode is selected.

In source mode the 1048 can test and calibrate meters, thermocouple indicators, data loggers. It can also be used for signal injection, semiconductor characterisation, or as a backing off source. In measure mode it can operate as a multimeter, accurately checking DC voltages and currents over 3 ranges.


Technical Specification
General Specification


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1048 Voltage/Current/Loop Calibrator

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