| Q1 |
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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.
| Q2 |
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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.
| Q3 |
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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.
| Q4 |
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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.
| Q5 |
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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.
| Q6 |
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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.
| Q7 |
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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.
| Q8 |
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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.
| Q9 |
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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.
| Q10 |
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How come GDS-3000 will occur "failed" during calibration. |
Since GDS-3000 request high quailty signal during calibration ,we are recommend to use RG400 or 5D2V BNC cable.
To use better cable will avoid noise to ensure calibration successfully.
| Q11 |
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What is VPO Technology? |
VPO is an abbreviation for Visual Persistence Oscilloscope.
VPO technology is used to adjust not only the intensity of the vertical and horizontal axis but also the intensity of the displayed waveform such that the display is like an analog oscilloscope. In addition, the waveform intensity can also be displayed as a temperature gradient or in gradient levels (grayscale). When a strong signal is generated, the signal will be brighter and will persist for a longer time on the display. This allows users to grasp any changes in a waveform, such as detecting the occasional infrequent waveform. This technology can be applied to development, debugging and for the observation of video signals.
| Q12 |
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Could you explain the how to verify the bandwidth accuracy and the rise time as the description on GW specification for GDS-1000A-U series. |
1. The system total rise time (Scope + probe) can be done with this formula: Tr SYSTEM2 = Tr PROBE2 + Tr SCOPE2, and also can drive the responded bandwidth by Tr =0.35/BW. Since it’s not easy to directly measure the rise time of each unit, Usually we measure bandwidth firstly, then use previous formula to get the rise time.
2. Following is our test method and result.
System configuration:
Test 1:
(1),Signal Generator setting:
Frequency: 1MHz
Amplitude: 300mV
(2), GDS-1152A-U (bandwidth: 150MHz) Oscilloscope Setting:
Vertical scale: 50mV/div
(3), Probe model: GTP-250A-2, attenuation position set to 10X, bandwidth from DC~250MHz
As the picture 1¸ the amplitude occupy 6 division for 300mV on the screen. The signal have no attenuation on the scope since weveform frequency is more below than system bandwidth.
Test 2:
(1),Signal Generator setting:
Frequency: 150MHz
Amplitude: 300mV
(2), GDS-1152A-U (bandwidth: 150MHz) Oscilloscope Setting:
Vertical scale: 50mV/div
(3), Probe model: GTP-250A-2, attenuation position set to 10X, bandwidth from DC~250MHz
From the bandwidth definition, the waveform amplitude at -3dB point will be attenuated to 70.7% that means the waveform will occupy 4.242 divisions on the screen. In the test 2 experiment, we can observe the amplitude occupy 5 divisions for 300mV on the screen as picture 4.
As the result, GW GDS-1152A-U has no doube with 150 MHz bandwidth as we advertise and also provide more spare bandwidth
3, The rise time of this configuration can be derived out as following result.
Bandwidth= 150MHz è Tr =0.35/BW= 0.35/150MHz = 2.3ns