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| Gw Instek GDS2204E (200MHz 4 channel DSO) review |
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| wraper:
--- Quote from: eeguy on September 16, 2016, 03:19:26 am ---Is it really true that the GDS2204E is newer, has better specs and cheaper than the GDS-2204A? --- End quote --- Yes it's true, except 1GSa/s vs 2GSa/s sampling rate as 2000E are budget series. Also 2000A does not include options by default, and need them purchased separately. |
| eeguy:
--- Quote from: wraper on September 16, 2016, 10:59:55 am --- --- Quote from: eeguy on September 16, 2016, 03:19:26 am ---Is it really true that the GDS2204E is newer, has better specs and cheaper than the GDS-2204A? --- End quote --- Yes it's true, except 1GSa/s vs 2GSa/s sampling rate as 2000E are budget series. Also 2000A does not include options by default, and need them purchased separately. --- End quote --- Thanks. Sorry, what do you mean by "not include options by default"? What options? From the specs: http://www.gwinstek.com/en-US/products/Oscilloscopes/Digital_Storage_Oscilloscopes/GDS-2000E Under Real Time Sample Rate: Max: 1GSa/s (4 ch model), Per channel 1GSa/s (2ch model) What does that actually mean? Does that mean on a 4 ch GDS-2204E model, the max sample rate of each channel is 1GSa/s even when all four channels are used? Under Trigger, it states that EXT* only on dual channel models. Does that mean I cannot use an external trigger such as a button to trigger on/off the recording on the GDS-2204E? |
| wraper:
--- Quote from: eeguy on September 16, 2016, 11:13:34 am --- --- Quote from: wraper on September 16, 2016, 10:59:55 am --- --- Quote from: eeguy on September 16, 2016, 03:19:26 am ---Is it really true that the GDS2204E is newer, has better specs and cheaper than the GDS-2204A? --- End quote --- Yes it's true, except 1GSa/s vs 2GSa/s sampling rate as 2000E are budget series. Also 2000A does not include options by default, and need them purchased separately. --- End quote --- Thanks. Sorry, what do you mean by "not include options by default"? What options? --- End quote --- For example: --- Quote ---I2C/SPI/UART/CAN/LIN Serial Bus Trigger and Decoding Function --- End quote --- Also full memory and other things fully enabled by default. In most of the scopes those need to be purchased separately and often will cost more than the scope itself. --- Quote ---Under Real Time Sample Rate: Max: 1GSa/s (4 ch model), Per channel 1GSa/s (2ch model) What does that actually mean? Does that mean on a 4 ch GDS-2204E model, the max sample rate of each channel is 1GSa/s even when all four channels are used? --- End quote --- It means that 2ch will always run at 1GSa/s, 4ch version will drop to 500 MSa/s if more than 2 of any channels simultaneously enabled. --- Quote ---Under Trigger, it states that EXT* only on dual channel models. Does that mean I cannot use an external trigger such as a button to trigger on/off the recording on the GDS-2204E? --- End quote --- Vast majority of 4ch scopes do not have separate external trigger input. Therefore you need to sacrifice one input channel for this purpose if you need one. |
| eeguy:
--- Quote from: wraper on September 16, 2016, 11:45:22 am --- --- Quote from: eeguy on September 16, 2016, 11:13:34 am --- --- Quote from: wraper on September 16, 2016, 10:59:55 am --- --- Quote from: eeguy on September 16, 2016, 03:19:26 am ---Is it really true that the GDS2204E is newer, has better specs and cheaper than the GDS-2204A? --- End quote --- Yes it's true, except 1GSa/s vs 2GSa/s sampling rate as 2000E are budget series. Also 2000A does not include options by default, and need them purchased separately. --- End quote --- Thanks. Sorry, what do you mean by "not include options by default"? What options? --- End quote --- For example: --- Quote ---I2C/SPI/UART/CAN/LIN Serial Bus Trigger and Decoding Function --- End quote --- Also full memory and other things fully enabled by default. In most of the scopes those need to be purchased separately and often will cost more than the scope itself. --- Quote ---Under Real Time Sample Rate: Max: 1GSa/s (4 ch model), Per channel 1GSa/s (2ch model) What does that actually mean? Does that mean on a 4 ch GDS-2204E model, the max sample rate of each channel is 1GSa/s even when all four channels are used? --- End quote --- It means that 2ch will always run at 1GSa/s, 4ch version will drop to 500 MSa/s if more than 2 of any channels simultaneously enabled. --- End quote --- Having full memory and I2C/SPI/UART/CAN/LIN Serial Bus Trigger and Decoding functions enabled by default seems to be a good deal. Given that I am told 1GSa/s should be sufficient for my use, is it bad to have the sample rate dropped to 500 MSa/s if more than 2 channels of the 4 channels GDS2204E is used? From the Keysight's specs for the 2000X Series: http://literature.cdn.keysight.com/litweb/pdf/5990-6618EN.pdf?id=2002854 The maximum sample rate is 2 GSa/s half-channel interleaved, 1GSa/s per channel The 3000T X Series: http://literature.cdn.keysight.com/litweb/pdf/5992-0140EN.pdf?id=2545408 The maximum sample rate is 5 GSa/s half channel interleaved, 2.5GSa/s all channel Does that mean for the 4-channel 2000X ones, when all four channels are used, the sample rate for each channel is 1GS/s while for the 4-channel 3000T X ones, when all four channels are used, the sample rate is 2.5GSa/s? |
| saturation:
When sampling rate drops the key problem is aliasing error. With mutiple channels engaged and I'm concerned about possible aliasing artifacts I intermittently turn one or several of the CH off; this raises the sampling rate instantaneously in real time so I can compare waveforms very quickly, flipping between full and reduced sampling. Its a simply ploy when using low cost DSO at your home lab versus better gear at work. --- Quote from: eeguy on September 16, 2016, 12:29:48 pm --- Having full memory and I2C/SPI/UART/CAN/LIN Serial Bus Trigger and Decoding functions enabled by default seems to be a good deal. Given that I am told 1GSa/s should be sufficient for my use, is it bad to have the sample rate dropped to 500 MSa/s if more than 2 channels of the 4 channels GDS2204E is used? .... Does that mean for the 4-channel 2000X ones, when all four channels are used, the sample rate for each channel is 1GS/s while for the 4-channel 3000T X ones, when all four channels are used, the sample rate is 2.5GSa/s? --- End quote --- Yes. There are extensive reviews and teardowns in the forum of both series DSOs but I can't recall the details, Keysight DSO do have more ADC to sustain the sampling rate. |
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