The Model 2520 is a fixed frequency (30 MHz) source at 50 ohms that provides an accurate level from “7 0 dBm to +20 dBm in 0.1 dB steps. It’s level is NBS traceable using thermal converter techniques at 0 dBm and with NBS certified fixed attenuators at other levels. The 2520 is generally used for calibrating RF power meters, however, it can also be used to calibrate attenuators or video detectors, etc. Or it can be used in an automatic test equipment (ATE) environment for maintenance and verification of equipment. The output impedance is 50 ohms, however, compensation for the 0.177 dB loss that occurs when connected to 75 ohm systems is provided. The Model 2520 is GPIB bus programmable.