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Q1 gw_product_detail_bar.png gw_product_detail_bar.png How to remove the effects of environmental noise when performing Pre-compliance tests?
The environmental noise includes conduction and radiation EMI. After connecting the DUT, the EMI measurement is performed before the power of the DUT is turned on. The result obtained is the environmental noise, and then the power of the DUT is turned on to distinguish between ambient noise and DUT EMI signals.
If the EMI generated by environment and DUT is in the same frequency bandwidth and the environmental signal is strong, then the signal is very difficult to distinguish. GW Instek's spectrum analyzer GSP-9330, in this case, uses Topographic mode (Display >> Window Setup >> Topographic or Topographic+Spectrum) to distinguish different signal sources in the same frequency bandwidth. However, the best solution is to measure in an environment with low ambient electromagnetic noise interference.
Topographic mode displays noise hidden in the scan signal (indicated by a red arrow)
Q2 gw_product_detail_bar.png gw_product_detail_bar.png What should I do if there is a difference between the Pre-compliance and the certified lab test results?
It is normal for the pre-compliance and certified lab test results to be different, so it is important to understand the cause of the difference in order to get a reference from the pre-compliance measurement so as to conduct debugging. The difference between the two can be referred to “What is the difference between the Pre-compliance test and the program used by the certified laboratory?”.
The most important thing is to establish a test reference for pre-compliance after obtaining the differences between the two. For example, pre-compliance test needs to be tightened and reduced a certain standard (such as 4dB reduction) under regulatory standards that is a margin for testing by certified laboratories. After accumulating and establishing such a test reference, the successful measurement rate in the certification laboratory will be greatly improved.
Q3 gw_product_detail_bar.png gw_product_detail_bar.png Is the equipment used by the Pre-compliance test different from that of the certification lab?

GW Instek's EMC pre-compliance solution focuses on enabling engineers to quickly and easily evaluate and debug product’s EMI in a general working environment. The differences of certified laboratories which focus on certification are as follows: 

  1. Impact of environmental noise: In the certified laboratory, the noise can be well controlled and regularlly examined; however, the environmental noise cannot be effectively suppressed in the general working environment. The conductive interference measurement is mainly the purity of the power supply in the working environment, and the radiated interference is the existing wireless signal in the environment. For suggestions on how to respond, please refer to “How to eliminate the impact of environmental noise when performing Pre-compliance measurement”?"
    Anechoic chamber has good electromagnetic wave isolation and grounding structure
  2. The instrument used by Pre-compliance is a spectrum analyzer, which is functionally different from the EMI receiver used by the certified laboratory.
    Spectrum Analyzer (left) and EMI Receiver (right)
  3. The probe used for the radiated EMI in the debugging stage is different from the antenna measurement used by the certified laboratory; the former is the near-field measurement of the electromagnetic field, and the latter is the far-field measurement. The two are essentially different.
    Near-field measurement of the probe on the PCB surface (left) and far-field measurement of the antenna  10m away (right)
Q4 gw_product_detail_bar.png gw_product_detail_bar.png What advantages does the GSP-830 Sequence function have, other than the fact that I can have a reduced PC set?

The GSP-830 built-in Sequence can enable a user not to write a sequence code without buy a PC, without learning any program language syntax, instead write and edit the desired codes in one’s own way. If it’s desired to have a transfer job on any GSP-830 machine, it can feasible to have a file transfer by using USB Flash. If any Sequence Control is desired to modify, a speedy modification job can be done well without any tedious Debug process.

Q5 gw_product_detail_bar.png gw_product_detail_bar.png Does the GSP Series equip a built-in Attenuator?

The GSP-830 doesn’t equip a built-in attenuator, externally instead. If an attenuator is essential, you can buy ATN-100(10dB attenuation) to meet your requirements.

Q6 gw_product_detail_bar.png gw_product_detail_bar.png How does the GSP-830 differ from the GSP-827 Battery operation?

The GSP-830 power supply is designed to equip a built-in AC+DC, it’s enough to only buy an optional battery. However, the GSP-827 is designed to equip an AC design. If battery operation is needed, it’s optional or essential to buy AC/DC Converter to enable the battery function normally.

Q7 gw_product_detail_bar.png gw_product_detail_bar.png Does your GSP-827 product provide 100 internal memory sets inside the machine? The GSP-830 only 10-set internal memory yet, less than the previous, why?

Since the GSP-827 can enable RS-232 connection accessible to capture the screenshot or settings, in fact, 100 internal memory sets can be used for few times. Plus, the GSP-830 can be designed to enable USB Flash easily accessible. In addition, the 10 built-in GSP-830 internal memories, the USB Flash storagable size is dependant upon the USB flash drive size. In this way, it’s actually handier than the GSP-827.

Q8 gw_product_detail_bar.png gw_product_detail_bar.png What is the multilingual interface provided by the GSP-830?

The GSP-830 currently provides 2 interfaces: English (default), Simplified Chinese.

Q9 gw_product_detail_bar.png gw_product_detail_bar.png How to read the Trace/Setup-*.tra/*.set file format in the USB flash of GSP-830?

In terms of the file format captured in the way from the GSP-830 front panel operates, other file formats such as tra(Track)/lmt(Limit)/cor(Correction Table)/seq(Sequence)/set(File Setting) except for the JPG file, can all be recognized the GSP-830, unable to be recognized well on other software. The file saved can only be available in file swapping for other GSP-830 file.

Q10 gw_product_detail_bar.png gw_product_detail_bar.png What’s the time for GSP-830 split-window?

It can be applicable in the dual band signal measurement, e.g., multiple radio signal, harmonic, etc. E.g., 900MHz RF signal and its third-intermodulation harmonic are tested to split into 900MHz/2.7GHz windows uniquely for observation.

Q11 gw_product_detail_bar.png gw_product_detail_bar.png What is the warranty for the GSP-Series spectrum analyzer?

There is basically 1-year warranty on the GW spectrum analyzer. If there’s any prolonged duration or extension, please confirm to consult the sales representative.

Q12 gw_product_detail_bar.png gw_product_detail_bar.png For the saved EagleShot TXT file, what else do there have?

TXT file consist of all the waveform frequency and amplitude (a total of 501 pixels), all the level such as(amplitude reference level, unit and scale, initiation/center/cut-off frequency/span range, RBW/VBW/Sweep Time, etc) are to e saved in the TXT file. Once time default is pre-set, time default will be saved in the file either.

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