5 Performance Tests46 Keysight 85024A User’s and Service GuideAverage Noise LevelDescriptionThis test procedure uses a power meter to measure the power level of the probeoutput when the probe tip is connected through 50 ohms to ground.Procedure1 Connect the power sensor to the power meter and allow the power meter towarm up for five minutes.2 Calibrate and zero the power meter.3 Enable averaging on the power meter.4 Connect the power cable on the RF probe to a power source, allow the probeto warm up for at least three minutes.5 Connect the probe tip adapter to the tip of the probe. (This effectively groundsthe probe tip).6 Connect the RF probe to the power sensor using a type-N barrel.7 Read the power meter. If the reading is unstable, visually determine theapproximate peak value over a period of about twenty seconds. Record thatvalue on the test record.Specifications (at 25 °C ±5 °C) <17 mV RTI (or –23 dBm at probe output)