Viewing Four Measurement Channels - Agilent Technologies 8753ET User Manual

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 situations where the analyzer will not update all measurements
continuously. For analyzers with source attenuators, such situations occur if channel 1
requires one attenuation value and channel 2 requires a different value, or if 2-port cal is
active and the port 1 attenuation value is not equal to the attenuation value of port 2.
Since one attenuator is used for both measurements, this would cause the attenuator to
continuously switch power ranges, which is not allowed.
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 measurement paths. To update both measurements, press
Sweep Setup MEASURE RESTART
page 7-14.

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.
Channels 1 and 2 are referred to as primary channels and channels 3 and 4
NOTE
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
active, pressing
AUX CHAN
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
format.
2. If channel 1 is not active, make it active by pressing
3. Press
DUAL | QUAD SETUP
Display
ON, and set
SPLIT DISP
The display will appear as shown in
of the display, channel 2 is in the upper-right quadrant, and channel 3 is in the lower
half of the display.
1-14
. Refer to "Source Attenuator Switch Protection" on
AUX CHAN
to ON enables channel 3 and its trace appears on the display.
, set
DUAL CHAN
to .
4X
Figure 1-9. Channel 1 is in the upper-left quadrant
to ON. For example, if channel 1 is
.
Chan 1
to ON, set to
AUX CHAN