LISUN LSG-1950S Goniophotometer for Traffic Signal Lamps – After-sales Frequently Asked Questions (FAQ)

LSG-1950S is a high accuracy automatic test system for luminous intensity distribution of traffic signal luminaires and it can be applied to quality evaluation and quality control. Fully meet the Final Report PC13050202 Oregon, ECE-R65, FMVSS108, GB13954 and GB 25991 Standard.

• Rotations of samples under test around both vertical axis (-90°~+90°) and horizontal axis (-35°~+35°)
• Accuracy of angle: 0.1°
• Resolution of angle: 0.01°
• Photometer detector: CIE class A (standard class) accuracy
• Software controls everything with high intellectual faculties and simple operation

Q1：The software cannot communicate with the device.
A1：① Confirm that the driver of the communication box is successfully installed.
② Connect the other end of the USB cable of the communication box to a USB port with stable power supply on the computer, and try not to use USB extension cables. The communication box is powered via USB cable.

③System configuration interface. Refer to the user manual and all the devices of the system you purchased, select the correct models for all devices, and then click “Auto Search Communication Port”.

If there is still an error message, please check whether the corresponding device has been purchased, whether the model is selected correctly, and whether the communication cable is connected correctly according to the prompt content.

Q2：A parameter on the front panel of digital power meter shows a negative value.
A2：Please check the wiring on the back of the power meter and confirm that the four wires A1 A2 V1 V2 are connected to the correct terminals.

Q3：The electrical parameters displayed on the digital power meter and the power supply are inconsistent.
A3：①The voltage displayed on the power supply is the total voltage of the entire circuit, while the digital power meter uses the four-wire measurement method, and the voltage displayed is the voltage value at the sample after removing the line voltage drop.
② Error caused by accuracy. The accuracy of DC power supply is higher than that of LS series digital power meter. The accuracy of LS series digital power meter is higher than that of AC power supply.

Q4：When the software opens, it prompts “File is not a database”.
A4：Click the white button in the picture below to create a new database file and save it on your computer. Subsequent test results will be automatically saved in this file. If this file is deleted or moved, you need to reopen the database file or create a new database file. If the computer is not logged in with an administrator account, the database file or the contents in the file may be automatically deleted. Please try to log in your computer with an administrator account.

Q5：The standard lamp can’t be turned on automatically.
A5：① Confirm that the AC/DC switch is at DC.

②Confirm that the input voltage and current are consistent with the standard lamp certificate, and be sure to select CC (constant current mode):

③Check whether the filament of the standard lamp is still intact. Severe impact during transportation and handling may cause the filament to break:

④Check the connection of the four banana-plug cables from the cabinet to the goniophotometer, and check the connection of the standard lamp power cable.

Q6：The difference between the calibration distance and the actual distance is big.
A6：After the calibration is successful, the calibration distance automatically calculated by the software is displayed here:

The actual distance is the distance from the center of the goniophotometer to the photo detector. You can refer to the darkroom drawings or actually measure it.
The difference between the two distances should be within 2% or less. If the difference is too large, the following steps may not be done well enough:
a. The standard lamp is unstable. The standard lamp needs about 15 minutes to be stable after turned on. Calibration can be performed when it is stable.
b. The darkroom is not painted completely matte black. There may be light leakage or reflection.
c. The hardware adjustment is not adjusted properly. Including the goniophotometer level, photo detector position and direction, Gamma axis zero direction, etc.
d. During calibration, the direction of the standard lamp is incorrectly adjusted.
Please check the darkroom and refer to the user manual to make sure every step is done correctly.

Q7：Under what circumstances is recalibration required?
A7：① If there are no changes in the darkroom or computer, theoretically there is no need to calibrate again.
② If you change the computer, you do not need to do the candela calibration again. You can directly enter the previous test distance and save it. However, spectrum calibration needs to be re-operated.
③ If the darkroom is replaced, both the candela calibration and spectrum calibration need to be re-operated.

Q8：Software can’t get electrical parameters.
A8：Please confirm that you selected the correct power meter model and the correct COM port. See the figure below:

If your power meter is only for AC, so please select DC power supply as the DC power meter if your sample is DC lamp. See the figure below:

Q9：DC samples can’t be turned on automatically.
A9：Please confirm that the voltage and current of the sample is within the limit of the DC power supply. For example, the limit voltage is 30V and the limit current is 10A for DC3010 DC power supply.
If the sample needs constant current (CC), you need to input its rated current and a high enough voltage.
If the sample needs constant voltage (CV), you need to input its rated voltage and a high enough current.

Q10：The test result is 0
A10：① Please check whether the calibration distance is normal. If the computer is not logged in with an administrator account or for other reasons, the calibration distance may be tampered with by the computer to 0. Please change it to the correct test distance:

② Check the K factor  at “System Configuration” of the goniophotometer software (No need to check if with no “K factor” option). Under normal circumstances without an attenuator, the K factor is 1. If you purchased an attenuator, please consult us to get the K factor of the attenuator. If the K factor is written as 0, the test result will be 0.

Q11：How to maintain the goniophotometer?
A19：① Keep the darkroom as dust-free as possible. If there is a lot of dust, the photo detector surface needs to be cleaned regularly (be careful not to scratch the detector surface).
②The hardware part does not require maintenance. The internal lubricant can be used for about 10 years.

Q12：Everything looks normal, but the software still can’t communicate with the AC power supply.
A27：Check the baudrate of it, and confirm it is 9600. If not, please set it to 9600.

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