Atec Agilent-8720D - Manual (Page 16)

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Source control
Sweep limits
Set start/stop or center/span of the stimulus
parameter (frequency, power, time) directly
through the source control keys and the control
knob, the step keys, or the data entry keyboard.
Sweep type
Set a linear or logarithmic sweep, an arbitrarily
defined frequency list, a power sweep, or a CW
(single frequency) type of sweep.
Fast swept list
Define up to 30 different subsweep frequency
ranges in any combination of CW, CW-delta F, or
start-stop sweep modes. Set test-port power levels
and IF bandwidth independently for each segment.
Measured number of points per sweep
Linear frequency: choose 3, 11, 21, 51, 101, 201,
401, 801, 1601 points.
Source coupling
Set a coupled channel sweep (same stimulus condi-
tions on both channels) or an uncoupled channel
sweep (ind ependent stimulus conditions).
Chop/alternate sweeps
Select whether to alternately or simultaneously
(chop) measure channels when measuring with
two-port calibration. Chop mode is faster, while
alternate mode optimizes dynamic range. The
default is chop mode.
Sweep time
Set sweep time in seconds, minutes, or hours.
Minimum sweep time is dependent on number of
data points per sweep and selected IF bandwidth.
Auto sweep time
Select auto sweep time by entering zero seconds
sweep time. The analyzer will sweep at the mini-
mum sweep time for any subsequently selected
stimulus conditions. Auto sweep time is the default
condition.
Sweep trigger
Set to either continuous, hold, single, group sweep,
or external trigger. Set external trigger to take a
complete sweep or to measure individual points in
a frequency, power, or list sweep.
Power
Control the test port signal by setting the internal
attenuator over a 70 dB range. Power trip automat-
ically reduces source power to its minimum value
when excessive signal levels are incident on the
receiver test port. A caution message is also displayed.
Source power range differs depending on the selected
options. Power slope can be set in dBm/GHz.
Continuous switching
Continuously switches the RF output between port
1 and port 2; enables simultaneous active display
of forward and reverse parameters.
Power meter calibration
Description
Use a power meter to set leveled input or output
power at the device under test at a single point or
an entire sweep. With an Agilent 436A, 437B, or
438A power meter connected, the calibration
sweep measures the actual test port power. After
the calibration is enabled, the internal RF source
power is adjusted (within the range of –85 to +10 dBm)
to achieve the selected power at the input of the
device under test rather than at the test port out-
put. GPIB control of the power meter for normal-
ization or leveling is built-in. Logarithmic, linear,
CW, and list sweeps can be calibrated.
Update Calibration
Select continuous leveling (requires a power splitter)
by measuring and updating source power on each
sweep or use a correction table (to modify source
power) which is created with an initial single sweep.
Number of readings
Make single or multiple power meter readings at
each frequency.
Data accuracy enhancement
Description
Measurement calibration is the process that signifi-
cantly reduces measurement uncertainty due to
system directivity, source and load match, tracking
and crosstalk. A wide range of calibrations are
available for the Agilent 8719D/20D/22D. Full two-
port calibration removes all the systematic errors,
resulting in the most accurate measurements.
Frequency response
Simultaneous magnitude and phase correction of
frequency response errors for either reflection or
transmission measurements. Requires a short or
open circuit termination (reflection), or a through
connection (transmission).
Response and isolation
Compensates for frequency response and directivity
(reflection) or frequency response and crosstalk
errors. Requires an open, short, and load circuit
termination (reflection) and a through connection
and load termination (transmission).
Capabilities (continued)