| Q1 |
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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:
- 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 - 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) - 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)
| Q2 |
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The measured voltage is 10/100/1000 times larger than the real value. |
The probe ratio in the CH1 or CH2 setup menu is set at X10, X100, or X1000. Please refer our user manual for details.
| Q3 |
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The measured voltage is 10 times smaller than the real value. |
The attenuation ratio on the probe is set at x10. If you switch it to x1, make sure that the input voltage does not surpass the maximum 400V.
| Q4 |
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In the multimeter mode, the measurement type at the top of the display says “ERR” which looks like an error message. |
The “ERR” sign appears when none of the measurement switch is pressed. Select one from the V, A, or R switch and press it.
| Q5 |
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The GDS-122 stopped working after a short period of time. |
The battery may need recharging. Connect the GDS-122 to the AC adaptor and recharge it for at least 15 minutes. Then try powering up.
| Q6 |
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The GDS-122 does not power up. |
The battery may need recharging. Connect the GDS-122 to the AC adaptor and recharge it for at least 15 minutes. Then try powering up.
| Q7 |
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What is your suggestion on when to use spectrum analyzer or 1M FFT while using MDO-2000E to conduct frequency domain analysis? |
Most frequency domain test requirements under 200MHz can be met by MDO-2000E’s Spectrum Analyzer. However, for higher frequency resolution applications such as two main frequencies of a dozens of MHz with frequency differences of 10KHz or even 1KHz, we suggest high-resolution 1M FFT function, which allows you to observe the detailed frequency components.
| Q8 |
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Can GDS-300/200 oscilloscopes use other GW Instek standard high voltage differential probes or current probes? |
Yes. GDS-300/200 oscilloscopes equips with a standard GDP-040D dual channel differential probe. Other standard differential probes or current probes such as GDP-025, GDP-050 or GDP-100 high voltage differential probes or the GCP series current probes can also be utilized.
| Q9 |
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Can the lithium polymer battery of GDS-300/200 oscilloscope be replaced by users? |
No, it can not. The GDS-300/200 oscilloscope battery is embedded in the rear of the master circuit board. In order to maintain the consistent quality, battery replacement service must be done by GW Instek specialists.
| Q10 |
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Do GDS-300/200 oscilloscopes have data log and waveform search functions? |
Yes. GDS-300/200 oscilloscopes have built-in 30,000 consecutive waveform records logging function. Its waveform search function can be conducted by reverse or forward steps.
| Q11 |
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Can GDS-300/200 transmit stored waveform data to the PC or cellular phone? |
Yes. GDS-300/200 oscilloscope can be functioned as a USB storage device. GDS-300/200 data can be either sent to the PC via USB connection or to cellular phone by the USB-OTG function.
| Q12 |
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Can GDS-300/200 oscilloscopes simultaneously operate the oscilloscope functions and DVM functions? |
Yes. GDS-300/200 oscilloscopes are not only equipped with the user interface of full touch screen, but also simultaneously operate the oscilloscope functions and DVM functions.