Precision DC calibrator for high currents and voltages

October 27, 2015 // By Graham Prophet
The Yokogawa 2560A precision DC calibrator offers a simple, stand-alone solution for the testing and calibrating DC measuring instruments such as analogue meters, clamp meters, thermometers, temperature transmitters and data loggers.

The 2560A generates signals over a wide output range to enable the testing of products over their full operating ranges. In particular, it can generate DC voltages up to 1224V and DC currents up to 36.72A. By connecting two instruments in parallel, a maximum current of 73.44A can be generated. These values are produced with high accuracy, high stability, and high resolution over the full voltage and current range.

Operation is provided by rotary dials and switches for each digit and function, along with traditional 7-segment LEDs to provide clear visibility. In addition, a range of interfaces enable the 2560A to be integrated into an automatic test system.

The output can be swept within the source range with sweep times of 8, 16, 32 or 64 seconds. Linearity tests can be simply performed by dividing the output into steps, with a setting of four, for example, generating steps of 25, 50, 75 and 100% of the set output value.

When the deviation dials are adjusted to check the full-scale value on the meter, the deviation from the main output setting is displayed as a percentage of full scale. The output value calculated from the main, divider and deviation settings is displayed, so that the user can directly read the output value. The EMF equivalent to the thermocouple temperature and resistance equivalent to RTD temperature can also be displayed.