Semight-SUPPORT-FAQ-Semight Instruments

Q&A

Common Problem

Product category

？Q

What Hardware Protection Measures Must Be Followed Before Power-On and Cable Connection for the DCA4201 / DCA6201 / DCA1065 Sampling Oscilloscopes?

A

To prevent damage to these precision instruments, the following four steps apply to the DCA4201 / DCA6201 / DCA1065 and must not be skipped:
1、The instrument must be properly grounded.
2、Before inserting the optical fiber, use a fiber inspection scope to inspect both the fiber end face and the DCA optical input end face. Ensure that both end faces are completely clean and free of any contamination.
3、When changing the cable connected to the TRIG port, power off the equipment and wear an ESD wrist strap to prevent electrostatic discharge from damaging the TRIG port.
4、When connecting the TRIG cable, check the TRIG port for any damage. Before use, it is recommended to clean the RF connector with an alcohol-moistened cleaning swab.
？Q

SMU - device interface problem

A

DB9 (9-pin, RS232) is only used for synchronization. USB and network cable are used for connection.
？Q

SMU - electric shock damages the device under test

A

Operate the LCD screen system - > misc - > outputrelay and set it to normal close mode
Outputrelay - >off open: when the channel output status is off, the internal relay of the instrument is in the off state; normal close: when the channel output status is off, the internal relay is in the closed state.
？Q

SMU - when the dual channel synchronization function is turned on, if the main channel is configured as a current source, connect the measured part (LR series element) to the probe of the main channel, and measure the magnetic coupling current of the measured part on the slave channel, if the: output1 command is not sent to the slave channel, only the: init command is sent to the slave channel, can the sensing current sampling data be read from the slave channel smoothly?

A

Before init, ensure that the source output status is on.
？Q

SMU - the command output1 precedes the command: will the issue of init affect the accuracy of measurement data? (difference in order of issue)

A

Before init, ensure that the output is on, otherwise an error will be reported. Output 1 is on, which has nothing to do with the accuracy of measurement data.
？Q

SMU - How should the master-slave configuration be set up for dual-channel synchronized sweeps on the S3022F? Do the two channels share a common ground internally?

A

When performing dual-channel synchronized operation on the S3022F, such as a DC pulse linear sweep, enable synchronization for both channels. Set the primary channel to Master and the secondary channel to Slave.
Common Ground: The two channels of the SMU do not share a common ground internally. If a common-ground measurement is required, the channels must be connected to a common ground externally.
？Q

SMU - is there a quantitative relationship between pulse width and pulse delay time?

A

There is no relationship between quantity and duty ratio. See the index book for details.
？Q

SMU - 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

SMU - what is the concept of source delay time (MS)， and What Happens If It Is Set Too Short?

A

Because the source output requires a certain amount of time to settle, the SMU needs a delay before taking a measurement. This allows the source output to settle before measurement, helping ensure more accurate results. This delay is called Source Delay.
The Source Delay should be longer than the source settling time. The required delay depends on factors such as the output amplitude and load characteristics. If the Source Delay is too short, the SMU may begin measuring before the source output has fully settled, potentially resulting in significant measurement error, with the measured value being lower than the actual value.

Site Map