Semight-SUPPORT-FAQ-Semight Instruments

Q&A

Common Problem

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？Q

Source table - trig: what are the trigger points set by count? If it is not set, what impact will it have on the test?

A

Trig: count is used in the scanning mode. The value of: trig: count is the same as the number of scanning points. This value is not required for fix continuous output mode
？Q

Source table - what is the concept of source delay time (MS)?

A

Source establishment time: if the setting value is too small (specifically related to amplitude), the source cannot be completely established, and the output value will be too small
？Q

What is the concept of source table - NPLC? If it is not set, what impact will it have on the test?

A

NPLC is the cycle multiple of sampling power supply, 1nplc = 20ms
If it is not set, there will be a default value. If the setting value is abnormal, the reading will be incorrect
？Q

What is the concept of source meter 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 source meter 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 source meter 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

Source meter - 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 4wire
？Q

How does the source meter measure resistance?

A

Main interface advanced option - resistance option - select resistance mode enable;
In addition, the current source mode is generally selected for resistance measurement, and the matching range needs to be selected, as shown in the following figure: when measuring 1 ohm resistance, the range defaults to 1a when testing current
？Q

Can the refresh rate of the source table be improved?

A

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

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