Anritsu ML2430A - Manual (Page 80)

Frequency Sweep
Mode
When the sensor/cal factor source is set to V/GHz in Source Sweep mode, the
start and stop voltages are assumed to be 0 and 10V, and the start and stop fre-
quencies are taken from the
System|Source sweep menu.
Calibrate the V/GHz setup by setting 0 and 10v and the frequencies (F1 and F2)
that these voltages correspond to (sweep width). This method activates real-time
cal factor correction on a swept basis (including any user cal factor tables) provid-
ing swept power measurements. Note that V/GHz output should not be used, as
this limits the range of the signal applied to the meter when sweeping narrow
widths. The fixed 0-10V ramp should be used to ensure correct sweep operation.
In normal operation, leave the
CalFactor|SOURCE set to V/GHz as this instructs
the meter to apply cal factor correction proportional to the input ramp, and en-
sures that the whole sweep of data is cal factor corrected in real time at every
data point. If the
CalFactor|Source is set to Manual or Frequency, a single fre-
quency cal factor will be applied through the sweep (or a manually entered
value). This may be useful for some applications where the sweep signal is used
for others purposes (for example, power sweep, etc.).
Power Sweep Mode In this mode the Ramp input is scaled to Start and Stop power settings. The start
and stop voltages are assumed to be 0 and 10V, and the start and stop power
settings are taken from the
System|Source sweep menu.
Make sure the Sensor|CalFactor|SOURCE is set to Frequency or Manual. In
power sweep mode V/GHZ is not used.
Source Sweep Graph The annotation at the bottom of the screen is manually entered (there is currently
no digital connection between the power meter and the source), and these can
be entered through the
SYSTEM|Source sweep|-more- Start and Stop softkeys.
Note that the scaling for the 10V ramp input is not directly applied to the bottom
of the screen; the user is able to enter this directly and may include effects of fre-
quency translation devices.
The other controls remain similar to the Profile graphic mode. SYSTEM|Control
provides access to most other functions used during measurement, such as
CURSOR movement and control, SCALING, and READOUT from the cursor.
Note that the “between cursor average” has no meaning in Source Sweep mode,
and in place of this the frequency of the measurement is indicated instead (x1
and x2). The readout is only updated while the system is sweeping.
Averaging may be applied by selecting
SENSOR|Averaging and setting the
STATE to ON. An averaging number may then be applied for either sensor inde-
pendently. Averaging is ‘EXPONENTIAL’ in character so changes in response (for
example, adjusting tuning of a filter) will gradually settle to their final measure-
ment value over a period of time. A larger number will take longer to settle. Good
measurements may be achieved down to –45 dBm (65 dB dynamic range) with
an average value as low as 4. Values up to 64 and higher produce significantly
lower noise readings. All averaging is performed on a true linear basis.
ML2430A OM 5-17
PROCEDURES SOURCE SWEEP MODE