Specifications

Chapter 3 45
Setting Measurement Conditions
Set Sweep Conditions
3. Setting Measurement Conditions
Set Sweep Range
Sweep range can be set in two ways: by specifying the center value and span value of the
sweep range or by specifying the sweep start value and sweep stop value. Use the
following GPIB commands to set a sweep range.
NOTE When sweep start or stop values are changed, center and span values are also changed
accordingly.
The E4991A provides a GPIB command to specify the sweep range for each sweep
parameter.
Frequency Sweep (Linear/Log Sweep)
If frequency sweep is selected as the sweep parameter, use the following GPIB commands
to set a sweep range.
Oscillator Level Sweep
When oscillator level sweep is selected as the sweep parameter, note that the GPIB
command used to set the sweep range depends on the unit in which an oscillator level is set
(current/voltage/dBm). From the following table, select the appropriate GPIB commands
to set the sweep range and to set the oscillator level mode to sweep mode.
Sweep parameter Sweep range GPIB command
Frequency sweep Start value FREQ:STAR on page 378
Stop value FREQ:STOP on page 379
Center value FREQ:CENT on page 376
Span value FREQ:SPAN on page 377
Full span value FREQ:SPAN:FULL on page 377
Sweep parameter Mode/sweep range GPIB command
Oscillator level sweep Set in current Mode SOUR:CURR:MODE on page 460
Start value SOUR:CURR:STAR on page 468
Stop value SOUR:CURR:STOP on page 469
Center value SOUR:CURR:CENT on page 458
Span value SOUR:CURR:SPAN on page 467
Set in voltage Mode SOUR:VOLT:MODE on page 479
Start value SOUR:VOLT:STAR on page 487
Stop value SOUR:VOLT:STOP on page 488
Center value SOUR:VOLT:CENT on page 477
Span value SOUR:VOLT:SPAN on page 486
Set in dBm Mode SOUR:POW:MODE on page 472
Start value SOUR:POW:STAR on page 474
Stop value SOUR:POW:STOP on page 475
Center value SOUR:POW:CENT on page 471
Span value SOUR:POW:SPAN on page 473