User`s guide

1-14

Making Measurements

Using Display Functions

Dual Channel Mode with Decoupled Channel Power

By decoupling the channel power or port power and using the dual channel mode, you can

simultaneously view two measurements (or two sets of measurements, if both auxiliary

channels are enabled) having different power levels.

However, there are two conﬁgurations that will not sweep continuously.

1. For analyzers with source attenuators, with channel 1 having one attenuation value

and channel 2 set to a different attenuation value, then continuous sweep is disabled to

avoid wear on the attenuator. A similar situation where this occurs is when a 2-port cal

is active and the port 1 attenuation value is not equal to the port 2 attenuation value.

Since one attenuator is used for both measurements, this would cause the attenuator to

continuously switch power ranges, so continuous sweep is not allowed. (The exception is

analyzers conﬁgured with option 400. Option 400 analyzers have two attenuators and

can allow different attenuation settings on each port.)

2. For ES analyzers 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 these conditions exist, 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 measurements. To update both measurement setups, press

. Refer to "Source Attenuator Switch Protection" on

page 7-13.

Viewing Four Measurement Channels

Four measurement channels can be viewed simultaneously by enabling auxiliary channels

3 and 4. Although independent of other channels in most variables, channels 3 and 4 are

permanently coupled to channels 1 and 2 respectively by stimulus. That is, if channel 1 is

set for a center frequency of 200 MHz and a span of 50 MHz, channel 3 will have the same

stimulus values.

NOTE Channels 1 and 2 are referred to as primary channels and channels 3 and 4

are referred to as auxiliary channels.

Channel 3 or 4 are activated when the Chan 3 or Chan 4 keys are pressed. Alternatively,

you can enable the auxiliary setting to ON. For example, if channel 1 is

active, pressing to ON enables channel 3 and its trace appears on the display.

Channel 4 is similarly enabled and viewed when channel 2 is active.

1. Press to select the type of display of the data. This example uses the log mag

format.

2. If channel 1 is not active, make it active by pressing .

Sweep Setup

MEASURE RESTART

AUX CHAN

Format

Chan 1