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.
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