Semight-SUPPORT-FAQ-Semight Instruments

Q&A

Common Problem

Product category

？Q

What is the concept of SMU clamp voltage? If it is not set, what impact will it have on the test?

A

When in current source mode, clamp voltage can be set
When the current source outputs, the voltage value will not exceed the clamping voltage. When the voltage value reaches the clamping voltage, the current will not rise
If it is not set, there will be a default value
？Q

What is the concept of SMU protection voltage (OVP)?

A

The voltage source output cannot exceed the OVP setting value. The default value of OVP is 24V, and the maximum value can be set to 72V
？Q

What is the concept of SMU clamp current? If it is not set, what impact will it have on the test?

A

When in voltage source mode, clamp current can be set
When the voltage source outputs, the current value will not exceed the clamping current. When the current value reaches the clamping current, the voltage will not rise
If it is not set, there will be a default value
？Q

SMU - what should I pay attention to when measuring a small resistance value? If the inductance is measured, the resistance of the measured inductance is 0.02 ohm.

A

When measuring small resistance, it is necessary to select the four-wire mode, because the wiring resistance may be greater than 0.02 ohm when measuring in the two-wire mode. Four-wire measurement method: A. Sense and Rorce in parallel, black end in parallel, B. Select four-wire mode, Advanced-Misc - set four-wire
？Q

Can the refresh rate of the SMU be improved?

A

No, the refresh rate cannot be improved due to the internal limitation of the firmware
？Q

Why is there no curve for the IV curve in the SMU scanning mode as shown in the figure below?

A

The automatic range cannot be used in the scanning mode, and the voltage range and current range need to be set to fixed mode; If the customer needs to scan from - 1V to 1V, 1V can be selected for fixed range
？Q

Why do two different meters measure the dark current of the same material differently?

A

Modify the measuring range. Since the dark current value is small, it is necessary to select the current gear and select 10μA for measurement
？Q

Why does the GUI display 65535 and above error codes when the error code tester tests

A

The error code is too large, and the error code test overflows. Pay attention to equipment grounding.
？Q

The bit error test instrument writes ate according to the process. Why is it possible that the eye chart test is interrupted during the test process

A

Confirm whether the sensitivity test is synchronized with the eye chart test. If it is judged that the lock is lost during the sensitivity test, the relock command will be executed. This operation will reinitialize the TX end. If the eye chart test is in progress at this time, the test will be interrupted.

Site Map