Source Sweep Mode Procedures
6-16 PN: 10585-00001 Rev. P ML2437A/38A OM/PM
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 frequency 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 independently. Averaging is
‘EXPONENTIAL’ in character so changes in response (for example, adjusting tuning of a
filter) will gradually settle to their final measurement 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.
System > Source Sweep > Data Hold can be used to select the way in which data is plotted.
Using Min/Max variation (both minimum and maximum) can be shown on the display. Using
Max effectively provides a peak hold. If the display of swept power is not what is expected,
check the setting of AVERAGE and the DATA HOLD mode in case it is affecting the data
processing.
Using an Anritsu Synthesizer
The ML243xA can be connected directly to the Anritsu MG3690- and 68/69000-Series
Synthesized Signal Generators using a special RS232 cable (Anritsu part number C37399).
To use this remote connection, the System > Setup mode must be set to Source sweep, and the
System > Rear panel > RS232 mode must be set to SOURCE IF. The RS232 mode can also be
changed using the GPIB command RSMODE.
When set up in this manner, all sweep frequency and power parameters will be
communicated from the source to the meter. If the source frequency power level or the
frequency itself is changed, the source sweep display will be updated where appropriate.
Using the MG3690-Series Synthesizer
The MG3690-series synthesizer can be used for source sweep mode. Option 06, Analog sweep,
must be installed in the synthesizer for this functionality.
Note
As with other graphic modes, improved speed can be achieved in ATE systems by
disabling the graphic draw function for the LCD through the menus using SYSTEM
> more > more > Graphics > CONNECT. Setting CONNECT to OFF displaces the
line-drawing between samples, and improves update rate. Similarly, for ATE
systems, the READOUT should be disabled for fastest throughput as this can all
be handled within the controller (PC). Sensor range hold is not available in this
mode of operation as auto ranging is selected.
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