The voltage and low 2A current terminals in 2000series calibrators built after August 2004 have advanced protection circuitry against damage to applied voltages on the output terminals. Before connecting the output amplifiers to output terminals when the ‘output on button is pressed, the 2000 series first tests for any applied voltage (greater than 10 Volts AC or DC).
In the event of power being applied to the terminals when the output is already on protection fuses inside the calibrator will blow.
There is a fuse in series with the positive voltage terminal, the positive 2 Amp current terminal and the earth terminal. One fuse on the PCB behind the terminals next to the earth terminal protects the negative to earth circuit. If power has been applied to the negative terminal when ‘negative to ground’ is selected this fuse will blow.
Should there be no output from the voltage terminal or from the current terminal then these fuses should be checked.
NOTE : THESE STEPS SHOULD ONLY BE FOLLOWED AFTER DISCONNECTING THE UNIT FROM LINE POWER
Step 1: Remove the screw covers at the edge of the Front Panel. Please take care not to damage the strips as these are no longer available.
Step 2: Remove the 2 screws at the end of the panel with a cross head screwdriver.
Step 3: Finally, check the Voltage and Current output fuses for continuity.