Power Sweep (Dbm); Cw Time Sweep (Seconds); Selecting Sweep Modes; Swept Or Stepped Frequency - Agilent Technologies 8719D User Manual

Power Sweep (dBm)

The POWER SYRUP softkey turns on a power sweep mode that is used to characterize
power-sensitive circuits. In this mode, power is swept at a single frequency, from a start power
value to a stop power value, selected using the Istart_] and (Stop_) keys and the entry block. This
feature is convenient for such measurements as gain compression or AGC (automatic gain
control) slope. To set the frequency of the power sweep, use m FREQ in the stimulus menu.
The span of the swept power is limited to being equal to or within one of the twelve
pre-defined power ranges. The attenuator will not switch to a different power range while
in the power sweep mode. Therefore, when performing a power sweep, the analyzer will
automatically switch to the PUB -GE MAN mode.
In power sweep, the entered sweep time may be automatically changed if it is less than the
minimum required for the current configuration (number of points, IF bandwidth, averaging,
etc.).

CW Time Sweep (Seconds)

The CN TfNE softkey turns on a sweep mode similar to an oscilloscope. The analyzer is set to a
single frequency, and the data is displayed versus time. The frequency of the CW time sweep is
set with t% FREQ in the stimulus menu. In this sweep mode, the data is continuously sampled
at precise, uniform time intervals determined by the sweep time and the number of points
minus 1. The entered sweep time may be automatically changed if it is less than the minimum
required for the current instrument configuration.
In time domain using Option 010, the CW time mode data is translated to frequency domain,
and the x-axis becomes frequency. In this mode, the instrument can be used as a spectrum
analyzer to measure signal purity, or for low frequency (~1 kHz) analysis of amplitude or pulse
modulation signals.

Selecting Sweep Modes

In addition to the previous sweep types, there are also two different sweep modes. These
can be accessed through the correction menu by pressing @ HQRE
or CNQP i
Calibration" section.

Swept or Stepped Frequency

The source can be either swept or stepped, depending on the selection of the
STEP SNP ON ofP softkey. Use STEP SNP QFF for faster measurement time, S'I'EP SNP QN
for greater frequency accuracy.
ALTERNATE
Application and Operation Concepts 6-25