Jeremy Li

1. It is still 62.5M,
2. I have no idea about the theoretical speed. but the TekScope need about  1 minutes to finish the 4*31.25M acquisition.

I tried to measured a 1M Ohm resistor, the voltage is +-50V, 15S, and the current is 50uA, -50uA,50uA, -50uA,50uA, -50uA,50uA, -50uA,50uA, -50uA,50uA, -50uA...... so according to &amp;#160;I calc=(I1+3(–I2) +3(I3) +(–I4))/8, the current&amp;#160; Icalc is 50uA or -50uA.&lt;br&gt; &lt;br&gt; sorry, overlook the information in your reply above. this seems to be ok for me to do the calculation.&lt;br&gt; &lt;code&gt;&lt;em&gt;1(I1) + 3(I2) + 3(I3) + 1(I4) all divided by 8. And the polarities of the current measurements are made to be all positive.&lt;/em&gt;&lt;/code&gt;<br> but it seems a bit different from the white pater

Hi Ty,
Thanks for the reply.
As describe in the document:

Note that not all of these currents are of the polarity that might be expected, given the polarity of the voltages applied (+, –, +, –).

Is it possible that  the current to be a negagive value according to I calc=(I1+3(–I2) +3(I3) +(–I4))/8,  and then how should we do with it?

And I&#160; found a strange issue that when the sample rate is set to 10MS/s, there seems easy to have errors when query by &quot;curve?&quot;.&#160;<br> but after setting the sample rate up to 50MS/s, the error disappear.&#160; (in RUN/STOP mode to acquire continuely)

<p>Hi&#160; Afonso and All,<br> 1. Is it possible to transfer data to PC and the scope do the acquisition at the same time? Does the scope working like this now?（ignore dead time)<br> The MSO2 series could not have &quot;roll screen&quot; currently, if the horizontal scale&#160; is long/big enough and above process working parallel, it seems the data will all be stored in the register/storage, is that means we could fetch the data to rebuild the roll screen in the PC software?<br> ah, how to say... for example: if one screen take 2s, transfer data cost 0.5s,&#160; if the scrope acquire&#160;and transfer data 10 times. how much time will the scope need to transfer all the 10 screens of data to PC. about 20S or 25S?<br> <br> 2. Is there a SCPI command to know when the register/storage is updated, I try to use &quot;curve?&quot; continuely and got more screens than the scrope acquired, so it seems some of them are the duplicated data. （RUN/STOP，not sigle trigger mode)<br> <br> 3. How does it working on the other series? such as TBS which have the &quot;roll screen&quot; mode.&#160; Do they acquire and store/transfer parallel?<br> and how is the register/storage working? do they same with MSO series and&#160; just with different display mode?&#160;</p>

Hello all,
according to Volume and Surface Resistivity Measurements of Insulating Materials Using the 6517B Electrometer/High Resistance Meter | Tektronix
 Icalc is a weighted average of the latest four current measurements, each at the end of a separate alternation.

Could you help to advise how to define the Weight of the four current measurement.  is it 0.25 for each current measurement or other?

And  I don't quite understand about below parameter for Standard method resistivity tests

PRE-DISCH: The predischarge time in seconds. 

BIAS-TIME: The bias time in seconds. 

MEAS-V: The measurement voltage. This is typically set to the same level as BIAS V. 
MEAS-TIME: The measurement time in seconds. 

what is BIAS-TIME, and what is the difference between predischarge time and measurement time

Hi Afonso,
Oops, after that, I didn't try to read the value again. it seems I couldn't find the CPOWER type on Page 2-886, the page is about MEASUrement:MECH:GRATio.  and does the command MEASUrement:MEASx:CPWIDTh not in the manual?

I didn't find the instruction for measurement:immediate in the manual. Are we talking about the same version of manual 077-1305-17?

And on the setting screen of Kickstart which below NPLC, is it Zero check or Zero correct? 
-----------updated: it seems to be auto zero.SYST:AZER

It seems RS232 connection will result in communication error when trying to read the data according to  Kickstart, but setting seems working.

Thanks Ty,
Now I'm understand the function of Zero check. But I'm still not sure about the difference between Zero correct and Zero check, It seems Zero check is enough.
How does Zero correct perform on the reading?
Is that means Zero correct is to eliminate the temperature effect?

Zero correction cancels the voltage offset term of the amplifier. With both zero check 
and zero correct enabled, the instrument may not display a perfectly zeroed reading.  
If Model 6514 is operating at, or near TCAL, zero correction will have very little affect. 
TCAL is the internal temperature of Model 6514 when it was last calibrated. 

Hello All,
I don't quite understand the function of Zero check and Zero correct.
What should we do before and after reading a value? that means when to enable and disable the function.
Could you help to explain more about these two functions?  thanks.