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| The Rigol DS1052E |
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| opus131:
I bought a DS1052E in December after seeing Dave's eevblog about the Fluke 87-V meter - the DS1052E is in that blog. I am really pleased to have found this thread. I found KTP's summary in #349 of the software method helpful. I had successfully used "echo" and "cat" on /dev/usbmtc0 to send "*IDN?", but I didn't like the timeout messages that accompanied reading usbmtc0. I have a dual serial port PCI card in my gnu/linux computer and I connected ttyS0 to the DSO using various adapters and an LED monitor I built about 25 years ago. Then I searched for a decent terminal emulator since I find using "echo" and "cat" quaintly archaic, and never did find "seyon" easy to use. I found a very nice one called "CuteCom", as easy as $ sudo apt-get install cutecom or rather, on my ubuntu system, # apt-get install cutecom CuteCom can be configured to send only a line feed and I was soon ready to send the commands to change the DSO version and then serial number. I used my own serial number with the second "D" in it changed to a "B". It was great seeing the 2 ns grid resolution on the horizontal scale and the system information showing DS1102E. Today I did some bandwidth tests. I used my FT-817 amateur bands radio transceiver on its half Watt setting at 146.52 MHz and sent a carrier through a 50 ohm attenuator so that a lab grade power meter could show the actual power out of the attenuator. That measurement showed 6.4 dBm. Next I used a precision 50 ohm dummy load in a T connector right on the channel one BNC connector. With the probe setting to x1 in the DSO, I measured a peak-to-peak voltage of 1030 millivolts, which across 50 ohms implies 4.2 dBm. The DSO loss is then 2.2 dB at 146.52 MHz. Setting the probe to x10 and putting the RP2200 probe into the same T connector and load with the same cable from the attenuator, I measured 800 mV p-p corresponding to 2.0 dBm. This means that the combination of probe and DSO drops 4.4 dB, implying that the probe itself also drops 2.2 dB. I do not plan to to change back to a DS1052E and do the measurements again. This modification shows that this manufacturer doesn't enhance the circuitry for the higher specification DSO - it appears to pass on the cost of a low pass filter to all customers and commits sabotage in the firmware. |
| Simon:
hey could ultrascope work over the com port ? after the money spent on the cable and time modding it I may as well use if if it's simpler, wait in the mean time for rigol to get serious about vista/7 |
| mxmxmx:
--- Quote from: Simon on March 24, 2010, 07:46:52 am ---hey could ultrascope work over the com port ? after the money spent on the cable and time modding it I may as well use if if it's simpler, wait in the mean time for rigol to get serious about vista/7 --- End quote --- Yes, Ultrascope also works over the RS232 connection. However, I'm not sure if you need a working VISA installation for that as well. Anyway, I still fail to see the problem. Install any VISA implementation which supports your OS (e.g. Agilent IO Libraries, NI Visa), plug in your scope via USB and run Ultrascope. I had no problem at all doing that under Windows Vista x64, so I don't suspect Windows 7 to be any different. Given the fact that Rigol made their scopes compliant to the USB Test and Measurement Class (TMC), I don't see why they need to bother to "get serious about vista/7". |
| Simon:
well mine plain refuses, might be something to do with the fact that I may need to track down the original driver and get rid of it. I have the RS232 cable and I don't think drivers are required so might as well give it a go |
| JimBeam:
Some more traces: Generator: Wavetek 1855-600 - lin. sweep - output: 55 dbmV nominal Scope: DS1052E(mod) - peak det. on - 75 Ohm BNC T-Termination - probe erroneously set to 1:10 - thus 5V/div... 1) Sweep 2..100 MHz 2) Sweep 100..200 MHz 3) Sweep 2..200 MHz |
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