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 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
. Refer to "Source Attenuator Switch Protection" on
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.
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 .
3. Press , set to ON, set to
ON, and set to .
The display will appear as shown in Figure 1-9. Channel 1 is in the upper-left quadrant
of the display, channel 2 is in the upper-right quadrant, and channel 3 is in the lower
half of the display.
Sweep Setup
MEASURE RESTART
AUX CHAN
AUX CHAN
Format
Chan 1
Display
DUAL | QUAD SETUP
DUAL CHAN
AUX CHAN
SPLIT DISP
4X