ModBox VNA
–
User’s Manual
Ref. Ed. B
–
12/05/2020
22
Step Action
Depending on your order, the ModBox may include either a
Digital
(DG) or an
Analogic
(AN) MBC.
Ignore this step and step 2 if your ModBox includes a
Digital MBC
(see step
3
).
Figure 8: AN MBC Feedback tab
Running Mode/DC Bias: This
parameter allows the user to switch between
automatic and manual mode.
In manual mode, you can set the bias voltage manually using the following
Bias Value parameter: you can set it between -10 V and 10 V.
In automatic mode, the system computes the bias voltage automatically: in
that case the bias value may not be manually adjusted. However, you can
initiate a rescan: the system will scan through the modulator’s bias voltage
values and restart the loop control.
In the case you want the system to be ran automatically, select AUTO for the
running mode.
•
Polarity:
select locking point Quad+ (positive slope) or Quad- (negative
slope).
•
Save:
Save MBC parameters so that they can be restored the next time
the ModBox is rebooted.
•
Calibrate:
Auto set MBC parameters.
•
Reset:
Reset feedback loop. Useful after a PG gains modification.
•
Graph:
Useful to save DC bias value over time for stability testing.
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