Procedures Source Sweep Mode
ML2437A/38A OM/PM PN: 10585-00001 Rev. P 6-15
The control for the min/max remains in the CHANNEL menu (CHANNEL > SETUP>-more->
MIN/MAX > RESET). The user should select the way he wants to work and leave it. In most
cases the SINGLE (default) is the most useful as it provides a continuously updated readout
of the min and max points within the cursor window. The INFINITE setting is used when the
results need to be collated over a large number of samples. In order to RESET the INFINITE
configuration, use the CHANNEL menu.
6-11 Source Sweep Mode
This feature allows the ML243xA Power Meter to be synchronized to an RF source using the
Horizontal ramp (to Analog Input) output on the RF source. The ML243xA can also optionally
use a Sequential Sync (to Digital Input) output on the RF source.
To enable the Seq Sync input for RF sources that do provide this output (the default), set the
System > Rear Panel > BNC > Input Port 1 > TTL LEVEL to HIGH. This way the device will
use both the Horizontal Ramp and Seq Sync inputs to sync to the sweep.
To disable the Seq Sync input for RF sources that do not provide this output, set the System >
Rear Panel > BNC > Input Port 1 > TTL LEVEL to LOW. This way the device will only use
the Horizontal Ramp to sync to the sweep.
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 frequencies 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) providing 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 ensures 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 frequency 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.
Note
In the triggered modes, such as Internal A or B and External TTL, the SENSOR >
SETUP > Range HOLD feature can still be applied to restrict dynamic range if
required.
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