It protects the output amplifier inside the instrument against any potential damage due to transient voltage that may be externally applied. After the firmware is installed, this feature is activated at power-on. When activated, this feature attenuates the output signal and turns off the test port LED each time a sweep finishes. At the same time, it switches the stimulus signal output test port in the trigger hold state to a pre-selected test. A test port 1 is selected at power-on.
The Init Src Ctrl feature lets you select the stimulus signal output test port in the trigger hold state. By setting the stimulus signal output test port to a test port which hardly experience transient voltage, this feature can reduce the possibility that the output amplifiers of the instrument may be damaged by transient voltage. Transient voltage occurs when the active DUT is connected or an external DC power supply is turned on. A test port not used or a test port to which the DUT input terminal is connected can be regarded as a test port which hardly experience transient voltage. The following table shows the degree of tolerance to transient voltage of each test with this feature. Connect the DUT so that transient voltage is not applied to test ports with low tolerance.
|
Test Port to select (Stimulus signal output test port) |
Low tolerance test ports Connected to the instrument's output amplifier.(Recommended connection: test port not used or DUT input terminal) |
High tolerance test ports connected to 50 ohm termination inside the instrument.(Recommended connection: DUT output terminal) |
|
When test port 1 is selected
|
Test port 1, test port 3 |
Test port 2, test port 4 |
|
When test port 2 is selected |
Test port 2, test port 3 |
Test port 1, test port 4 |
|
When test port 3 is selected |
Test port 3, test port 1 |
Test port 2, test port 4 |
|
When test port 4 is selected |
Test port 4, test port 1 |
Test port 2, test port 3 |
We recommended you to use this feature in single measurement (when performing manual measurement) or :INIT:CONT OFF (when using a program) since the stimulus signal output destination is switched to the selected test port only in the trigger hold state
Usage:
Trigger: Trigger > Single is recommended.
Turning on the Init Src Ctrl feature: System > Service Menu > Init Src Ctrl [ON]
Specifying the Init Src port: System > Service Menu > Init Src Port [1|2|3|4]
:INIT:CONT OFF
:SYSTem:ISPControl[:STATe] ON
:SYSTem:ISPControl:PORT 1
When using the front panel menu :System > Service > Init Src Ctrl [OFF]
When using the SCPI command : SYSTem:ISPControl[:STATe] OFF
When using the VBA command: SCPI.SYSTem.ISPControl.STATe = False
Other topics about Setting Control Functions