HP 8360 manual Operating and Programming Reference F-9

Fitness Henu

If the correction frequency span is only a subset of the start/stop frequency span set on the source, no corrections are applied to the portion of the sweep that is outside the correction frequency span. The following example illustrates how the data is distributed within the user flatness correction array.

Assume that the synthesizer is set to sweep from 2 to 18 GHz, but you only enter user flatness correction data from 14 to 18 GHz. Linear interpolation occurs between the correction entries to provide the 401 points required for the 14 to 18 GHz portion of the array. No corrections are applied to the 2 to 13.99 GHz portion of the array. Refer to Figure F-4.

HP 8360

User’s Handbook

Point Number --) 0		1200		1600
	No Corrections Applied		401 P o i n t s
			o f D a t a
Frequency --) 2GHz		14GHz		18GHz
	1st Corr . Freq .

Figure F-4.

Array Configuration when the Correction Data Frequency Span is a Subset of the

Synthesizer Frequency Span

Number of points interpolated between correction entries is calculated as follows:

freq. span between correction entries

1600 - 1 = Number of pts

stop frequency - start frequency

When correction frequencies are arbitrarily spaced, the number of interpolated points varies.

When utilizing the user flatness correction feature, do not exceed the synthesizer ALC operating range. Exceeding the ALC range causes the output power to become unleveled and eliminates the benefits of user flatness correction. The ALC range can be determined

by subtracting the minimum output power (-20 dBm) from the maximum specified power. When the optional step attenuator is ordered on a synthesizer with firmware released prior to November 1990, the attenuator needs to be uncoupled to obtain the full ALC range. This can be accomplished by selecting POWER [MENU] [Uncoupl Atten]. For example, an HP 83620A has an ALC range of 230 dB (>+lO to -20 dBm).

When user flatness correction is enabled, the maximum settable test port power is equivalent to the maximum available leveled power minus the maximum path loss (PO maX - P&&h loss). For example, if an HP 83620A has a maximum path loss of 15 dB due to system components between the source output and the test port, the test port power should be set to -5 dBm. When user flatness correction is enabled, this provides the maximum available power to the device under test (DUT).

Operating and Programming Reference F-9