HP Saw E4419B manual Making Difference Measurements

Power Meter Operation

Making Difference Measurements

Making Difference Measurements

Dual channel difference measurements can be made on the currently

selected window by pressing SetupMeas , Input Select , More and selecting

A-B or B-A . The power meter always carries out “Maths” calculations in Watts. The power meter displays the numerical difference of the power values of both channels in dBm or Watts. The power value for each channel includes offsets, calibration factors and duty cycle in addition to measured power. The filter, range (where applicable), offset, duty cycle and calibration factor are set individually for each channel.

Logarithmic units (dBm) can be used in A-B difference measurements where the channel A power level is less than the channel B power level. Likewise, logarithmic units can be used in B-A difference measurements where the channel B power level is less than the channel A power level. However, the negative sign is ignored and a log error is displayed on the status line and in the error queue.

Difference measurements can be displayed relative to a stored reference. In relative mode readings are displayed in either dB or %. Refer to “Making Relative Measurements”, on page 2-37 for further information.

HP E4419B User’s Guide 2-53