User`s guide

4-40 Agilent E6432A Microwave Synthesizer User’s Guide
HPE6432_EnterFlatnessCalReading
ViStatus HPE6432_EnterFlatnessCalReading(ViSession
instrumentHandle, ViReal64 reading);
Purpose
There are six associated functions used to produce output power level
correction values. This function is one of the six associated functions
and accepts a power meter reading, computes a corresponding
correction value, and stores this correction value in a correction table.
It then interpolates between the next lower correction and the current
correction if necessary to fill the table. If the data is for an attenuator
path and of a lower resolution than the through path, the interpolation
uses the through path data with a computed offset for the attenuation
setting.
Because output power level can vary over the synthesizer’s frequency
range and attenuator settings, correction values can be produced and
applied to the output power level so that it is essentially “flat”.
Once output power level correction values have been produced and
applied, the synthesizer can be programmed to any frequency from
10 MHz to 20 GHz and attain power level accuracy:
❏❑better than +/– 1.5 dB (over the full attenuator range)
❏❑better than +/– 1.0 dB (at a fixed attenuator setting)
These levels of output power level accuracy allow for all measurement
uncertainties and variations over temperature. The actual
performance achieved with the same power measurement device at a
single temperature and at any frequency (from 10 MHz to 20 GHz)
typically will be less than +/– 0.1 dB.
For complete specifications, refer to “Specifications and
Characteristics” on page 6-1.
Parameter List
instrumentHandle
Variable Type ViSession
This is the ViSession handle that is obtained from the Initialize
function. The instrumentHandle identifies a particular instrument
session.
signalPath
Variable Type ViReal64
This parameter accepts the power meter reading for the calibration
point being measured.