HP 8753E manual Four-Parameter Display Functions, Customizing the Display, Ble

However, there are two coniigurations that may not appear to function “properly”.

1.Channel 1 requires one attenuation value and channel 2 requires a different value. Since one attenuator is used for both testports, this would cause the attenuator to continuously switch power ranges.

2 . With Option 007 (mechanical transfer switch), channel 1 is driving one test port and channel 2 is driving the other test port. This would cause the test port transfer switch to continually cycle. The instrument will not allow the transfer switch or attenuator to continuously switch ranges in order to update these measurements without the direct intervention of the operator.

If one of the above conditions exists, the test set hold mode will engage, and the status notation tsH will appear on the left side of the screen. The hold mode leaves the measurement function in only one of the two measurement paths. lb update both measurement setups,

press LMenu) ~~~~~~~~-;. Refer to “Source Attenuator &&itch Rote&ion” earlier h m

.._.................

chapter for more information on this condition.

Four-Parameter Display Functions

The (j-d menu allows you to enable the auxiliary channels and conhgure a four-parameter display. This section describes those functions in the ljj) menu which affect the four-parameter display. See “Using the Four-Parameter Display Mode” in Chapter 2 for the procedure to set up a four-parameter display.

A full two-port calibration must be active before an auxiliary channel can be enabled. A full two-port calibration can be performed before enabling the auxiliary channels, or it may be recalled from a previously saved instrument state. If a full two-port calibration is recalled from an instrument state, you may have to change some of the parameters of the recalled state so that you can test your device.

Once a full two-port calibration is active, you can enable the auxiliary channels by setting			.,.,.;_,,
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~~~~~~~6~~ to #. For example, if channel 1 is a&&e, pressing ~~~~~~~~~~~

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enables channel 3 and its trace appears on the display. Channel 4 is similarly enabled and viewed when channel 2 is active: -

An important point to remember about the auxiliary channels is that they always have the same stimulus parameters as their primary channels See “Channel Stimulus Coupling” earlier in this chapter.

Customizing the Display

When one or both auxiliary channels are enabled (see “Using the Four-Parameter

Display Mode” in chapter 2, =Making Measurements") ~~~~~,~,~~~~~~~ and

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..	.,, ,,.,,,,,..,,.,,,,. .,	..-..	..i.~	;:;.	...~.CT~.~	.i.:::.

~~~~~~~~~~~~~~~~:~~~~ &era& to produce different &splay con@rations according to ,:...:.: I~..:.:.~~.~~~~~:.:.:.:.:~~~: .....;>:.....:;::.:.:.:.:.:: _p.,.,.,.:'....~.~.;..A __.............::..::.. ;...:.;

%ble 6-2.

Application and Operation Concepts 645