![]() The new DNA is then incorporated into the host cell genome by an integrase enzyme, at which point the retroviral DNA is referred to as a provirus. Once inside the host cell's cytoplasm, the virus uses its own reverse transcriptase enzyme to produce DNA from its RNA genome, the reverse of the usual pattern, thus retro (backwards). HIV retrovirus schematic of cell infection, virus production and virus structureĪ retrovirus is a type of virus that inserts a DNA copy of its RNA genome into the DNA of a host cell that it invades, thus changing the genome of that cell. For the journal, see Retrovirology (journal). Then I went on to the Power Supply, -15 The output of the LM317 is + 18 V (correct) The output of the LM337 is - 17 V (bad) Can I assume that the LM337 is bad? Or do I need to look at some other causes that killed the regulator? Also, isn't it strange that with such a bad supply voltage that the instrument is only giving the Ohms errors? Also, why is the + Voltage on the U201-A at +23 V, if only the negative regulator is bad? Thanks for any further feedback."Retrovirology" redirects here. Here are tee values, measured with a 10 MOhm impedance voltage meter: 100M range = 2.5 V stable 10 M range = 5.0 V stable 1 M range = 10 to 13 V jumping around Same for all other ranges, down to the 100 Ohm range Sometimes the voltage is going down to 7 V but then back up to 10 or 11 or 12 or 13 V On the OpAmp U201-A I am measuring the supply voltage as 23V, so it is 5 Volts too high. The output voltage at the terminals in 2W Ohm setting is wrong As you already indicated, it is too high. So, it seems the zener is working perfectly. The Voltage across the zener is stable at 5.17 V at all 2W ohm ranges. ![]() CR203 is a dual package zener with 5.1V but only one side used, it seems. Hello Frank and thanks for the detailed feedback. Frank PS: On my old HP34401A, I just checked the output voltage in overload condition, with an 10MOhm voltmeter: It ranges from 7.8V in the 2W-100 Ohm range, up to 8.4V in the 2W-1 M range. Your description indicates, that every other component in the Ohm current source circuitry is ok. Therefore check with shorted Ohm input, if it zeners about 4.7.5.1V. ![]() This CR203 has 4.7V or 5.1V, depending on vintage of your instrument. #Virus scanner plus error 613 pdf#See schematics page 9-10 or pdf page 157. There will be a failure either in the +18V power supply (which would endanger your whole instrument), or zener CR203 is short, and applies more than about 13V at pin 3 of Fineline resistor array U102D. I bet it even exceeds 10.5V, where it should be limited to 7V typical. ![]() 10k range, and measure the output voltage between Hi and Lo by a multimeter (10M or infinite input resistance). You may check that, by choosing a fixed (manual) 2W Ohm range, e.g. I expect, that this compliance voltage is too high. That means, it is checked, that in case of overload in Ohm mode (open or too high resistance per Ohm range), the output voltage does not not exceed 7V(+-3.5V). ![]() All of these failing tests you've reported, all check the Ohm compliance voltage, not the Ohm current sources themselves. Hi, and sorry, I have written some nonsense, as I did not fully read the error description. ![]()
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