MODEL 689B: 100A POLY-PHASE METER TESTER

The Model 689B is a full digital and analogue meter tester, with a microprocessor to carry out most measurements to within 0.1%, however it will also calculate meter errors to an accuracy of 0.03% to 0.05% when performing real energy measurements.

The 689B has a 3-phase switch mode current source. For testing direct connected meters to 1 00A there are 6 large 6mm sockets on the front panel. Testing CT meters to 1 0A is done using the multi pin “CURRENT” socket on the front panel.

The “PHANTOM/CUSTOMER” switch on the front panel allows switching from a phantom test to a customer test of CT. meters without disturbing the writing.