LISUN LS9955/LS9956 Automatic Safety Test System – After-sales Frequently Asked Questions (FAQ)

The LS9955/LS9956 Automatic Safety Test System (electrical safety analyzer) combined the following function in one set: Withstand Voltage Test (AC/DC), Insulation Resistance Test (IR), Leakage Current Test (LLC), Grounding Resistance Test (GR) and Power Test.

LS9955_Automatic Safety Test System

The LS9955/LS9956 Automatic Safety Test System is according to GB4706.1, IEC/EN60335-1, UL60335, GB7000, IEC60598, GB4943, IEC60950 and GB9706.1. It is used for luminaries, home application and motor tools safety test in production line or R&D Lab.

Q1: If the DUT does not have a ground wire, how to connect the LS9956?
A1: LS9956 also needs to use the ground clamp when testing other items, so if the sample does not have a ground wire, the wiring of the LS9956 should be adjusted as follows: the original wire at ① is moved to ②, that is, there are two wires at ②. The original wire at ③ is moved to ④, that is, there are two wires at ④. Please see the picture below.
And the wiring of the DUT is as follows: It has no ground wire, that is, the power cord is a two-core wire, and the ground clamp is still connected to the metal part of the sample housing (if the housing has no metal, it can also be clamped to the housing). Please see the picture below.

Q2: The DUT cannot be turned on automatically and unable to measure its electrical parameters. 
A2: The terminals ① in the figure below is used to supply power to the DUT. Please connect the external power supply according to the rated voltage of the DUT. Before testing, make sure the switche ② is on. Note: The power lines and power supply required here need to be prepared by the client. Please see the picture below.

Q3: After pressing the START key, the LS9956 cannot start testing.
A3: After all parameters are set, move the cursor to “Page”. Then you can start the test. Please see the picture below.

Q4: The test ends and  “NG” appears.

A4: The DUT failed to pass this test.

Q5: The test result shows “OVER”.
A5: The test result exceeds the LS9956 range.
Note: Just out of range does not necessarily mean that the DUT is not good. For example, in the picture above, the insulation resistance exceeds the range, indicating that the insulation of the sample is very good. Judgment should be made based on the items tested.

Q6: “Adjust” error appeared when you test leakage current LLC.

A6: The two terminals marked “Leak” on the back of the LS9956 need external power supply for leakage current  test. Note: The power lines and power supply required here need to be prepared by the client.

When setting the test parameters, the leakage current test voltage is set here.

The set voltage should be consistent with the actual voltage at “Leak” terminals, and the error should not exceed 2V. Otherwise, an “Adjust”error will be prompted during the test.

Q7: “Exceed current break” error appeared. 

A7: The current exceeds the LS9956 test limit. Please check whether there is a short circuit between the DUT live wire L, neutral wire N and ground wire PE.

Q8: “Open” error appeared during ground test.
See the picture below:

OPEN is displayed during Ground test

A8: When testing the ground resistance GR, if the DUT has no ground wire, or there is an open circuit between the ground wire and its metal shell, this error will appear. If the DUT does not have a ground wire, there is no need to test the ground resistance GR. If the DUT has a ground wire, please check whether there is normal continuity between the sample ground wire and its metal shell.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Integrating Sphere, Spectroradiometer, Surge Generator, ESD Simulator Guns, EMI Receiver, EMC Test Equipment, Electrical Safety Tester, Environmental Chamber, Temperature Chamber, Climate Chamber, Thermal Chamber, Salt Spray Test, Dust Test Chamber, Waterproof Test, RoHS Test (EDXRF), Glow Wire Test and Needle Flame Test.

Please feel free to contact us if you need any support.
Tech Dep: Service@Lisungroup.com, Cell/WhatsApp:+8615317907381
Sales Dep: Sales@Lisungroup.com, Cell/WhatsApp:+8618117273997