1-14
Making Measurements
Using Display Functions
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 c ause t he a ttenua tor 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 or 085 (options using a 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 auxil iar y c ha nnel s
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