DC Source Control

How to start the DC Source Control dialog

Using Hardkey/SoftTab/Softkey

Using a mouse

1. Press Sweep > Source Control > DC Source....

1. Click Stimulus.

2. Select Sweep.

3. Select Source Control.

4. Select DC Source.

DC Source Control dialog box help  

Name  Lists the names of the configured DC Sources. In the above image:

• AuxOut1 and AuxOut2 are internal VNA DC sources that are available

• • Analog Out 1 and 2 on the M9341B.

• MyDCSupply is the name of an external DC Source. Learn how to setup and configure an External DC Source and DC Meter.

State  Set the state of the DC source.

• ON  DC Source is always ON.

• OFF DC source is always OFF.

• Per Port  The Name selection for that DC source expands to allow an Port <n> / N/A setting for each VNA port. When the RF source for that port <n> is ON, then the DC source for port <n> is also ON. Select 'N/A' to turn the DC Source OFF for that port.

Start / Stop DC   Set the start and stop voltages of the DC source. The VNA will step the voltage of the DC source from Start to Stop in increments = (Stop - Start)/Number of data points.

Buttons

Limits  Click to start the DC Limits dialog.

Receiver Leveling  For future use.

DC Limits dialog box help  

Select the Minimum and Maximum voltages to which the specified DC sources can be set by the VNA. When the DC source level exceeds the limit, DC source is turned off and the measurement sweep stops. For M9485A only, DC source is clumped at the limit level and the measurement sweep continues.

Note: When the M9341B is not located at the next slot of the most right receiver (M9378A/B can be placed between M9377A and M9341B), the measurement speed may be slower. In this configuration, the DC source level exceeding makes sweep stop and DC source off.  

Analog Out dialog box help

This tab is displayed only when the M9341B is installed.

Note (M9485A): The M9341B should be placed at next slot of the most right receiver (M9376A/77A).  For the M9377A, the M9378A/B can be placed between M9341B and M9377A.  Otherwise, the measurement speed becomes slow.

Range  Selects the current range of output from 50 m or 500 mA

Pulse Modulate  Enable the pulse modulation for Analog output signal. The Analog output signal is output synchronized with the pulse signal which is inputted into SMB Sync 4 port on the M9341B.  When the basic RF pulse measurement option (025) is installed, connecting SMB sync 4 and any connector from P1 to P4 allows you to make a pulsed AUX output with the internal pulse signal. When the option is NOT installed, only AuxOut can be pulse modulated and the external pulse signal is required.

Over-current Protection  Shows the status of signal output, Output On or Output Off. Note that when the protection turns off the output, the "DC Source" dialog the state of the analog output may still indicate that it is "on" because this state is independent of the protection.

Set Ouput Levels Displays DC source dialog box to define the DC source.

Pulse Gen Config...  Displays Pulse Setup Dialog box to define the internal pulse signals. This button is displayed and available only when the pulse basic RF pulse measurement option (025) is installed.

Reset Protection  Resets the over-current protection for all channels

Measurement Time   Specifies the measurement time. This can calculated by (Number of Samples) x 20 nsec. This is the same entry in Analog In Tab.

Number of Samples  Specifies number of ADC samples for one point. One ADC sample takes 20 nsec. Increasing this number improves the stability of DC measurement. This is the same entry in Analog In Tab.

Calibrate Analog Out  Executes the analog out calibration. No setup is required for calibration. Validation of calibration: 1 hour and ±3 cº from previous  calibration.