The PAC 10 and PAC 20 Series clamps offer an ergonomic design and high-performance technical specifications making them extraordinarily simple to use. The PAC models can be used to measure direct or alternating, sinusoidal or distorted currents with or without a DC component. The result of considerable study in the field, the PAC Series is available with 2 specific jaw shapes. Hooked up to a multimeter, logger, oscilloscope, etc., the PAC clamp simplifies measurement of all currents, without any risk and without shutting down the installation.  As soon as a PAC clamp is powered up, a LED indicates that it is in operation, that an external power pack is connected and that the standby mode is activated (green colour) or deactivated (orange colour). Before any current measurements, you must adjust the DC Zero which can be done instantaneously by simply pressing with your thumb.  If the current measured is too high, a red LED flashes. If the clamp is no longer in use, it shuts down automatically. The automatic poweroff function can be deactivated. For intensive use or to record measurements over a long period, the PAC clamp can be powered by an external 5  Vdc power pack via its µUSB connector. If the external power source cuts out temporarily, the battery takes over.