Dave Proudlock

<p>Cables are ~ 1m. I can't use 2W as it opens switch 215 leaving the backplane in 10x2 mode rather than 5x4 which would cause issues elsewhere.</p> <p>After further investigation the parts I am measuring are 5M to 100M with a fixed parallel capacitance of 24nF, which gives a significant settling time of ~ 1sec. Nothing I have found to try within the IVI-COM driver seems to better the &quot;measure wait 1 sec and measure again&quot; method I mentioned in my OP, although this doesn't quite give the value seen with the meter running in continuous mode.</p> <p>I have tried increasing various delay functions (NPLC = 12 max, Aperture = 0.24s max, fixed range(100M) delays = 275ms max) but none are long enough to allow the reading to reach the value that it achieves when the meter is running in continuous mode. Other delay functions just seem to delay the actual taking of the measurement without the part actually being connected to the meter for the entirity of the period.</p> <p>Can you point me to an IVI-COM driver command that can allow the shunt capacitance to charge from the meter to its final value before takng&#160;the resistance measurement?</p> <p></p> <p>Thanks</p>

It is a 7707 card, in slot 2<br> <br> Cheers.

Hi&#160; - I have two 4W resistance channels set up, channels 201 &amp; 202. Channel 201 will be measuring high values - from 10M to Open Circuit while Channel 202 will be measuring low values - less than 2R.<br> <br> When switching from Ch 202 to CH201 the next reading of Ch201 (very occasionally two readings) will either display a -ve value of else be an incorrect value. If I repeat the measurement it will settle down to a final value. I've tried experimenting with time delay before taking the Ch201 reading but it definitely seems to require the second read rather than just time to settle. The DMM is set to Autorange.<br> <br> Have you any thoughts as to what can be going on?

Code is now correctly displaying the values on the front panel display - Thankyou!&#160;<br> <br> Elsewhere in the program I was adjusting the 7707 backplane switches independently (216 &amp; 217) which mean that the readings in the buffer were tagged with &quot;Rear&quot; rather than the channel number. Tidying up the other code to leave channels 201 &amp; 202 as 4W channels sorted it out - the buffer now show 201 &amp; 202 tags as expected and the values are display full size on the front panel.<br> <br> Thanks again.

Good Find! OK, so I can now remotely set the watch channel(s) - unfortunately the main display still does not update with the measured value (although the measurement is made and I can write it to the User_Swipe Screen)! (See Attached jpg)

Public Function MeasureResistance() As String

 DAQ6510.Buffer.Clear defbuffer1
 DAQ6510.ChannelFunction("201") = KeithleyDMM6500FunctionEnum.KeithleyDMM6500Function4WireResistance
 DAQ6510.System.WriteString (":DISP:WATC:CHAN (@201)")  'set desired watch channel
 MeasureResistance = DAQ6510.Measurement.Measure(KeithleyDMM6500Function4WireResistance, defbuffer1, "READ")
  
End Function

Thanks for this. I can't find any way of setting "watch channels" directly, using the IVI-COM driver and I didn't really want to change methodology to write TSP commands at a "lower level". 

I did however, set watch channels from the front panel but this did not update the main display when values were measured as I wanted. (I'm assuming setting watch channels here is the same as setting them remotely using the TSP commands).

Currently I'm using a work around by writing the measured value to the "User Swipe" screen although this isn't as pleasing as having the value displayed full size on the Home Screen.

Is there really no simple way to display remotely controlled, Rear Panel measurements full size on the Front panel? It seems such a logical thing to want to do, I'd be amazed if it can't be done!

Sorry for the delay, I've been out of office.

For reasons too long to go into here, it is operated remotely via PC running a VB6 application (I know, I know)!

Set up is -
 
            Set DAQ6510 = New KeithleyDMM6500            
            DAQ6510.Initialize "GPIB0::" & CStr(18) & "::INSTR", True, True, ""
            .
            .
            DAQ6510.Function = KeithleyDMM6500Function4WireResistance

Read command is -

           
            ResistanceMeasurement1 = DAQ6510.Measurement.Measure(KeithleyDMM6500Function4WireResistance, String1, String2)

As I said, the reading is taken as expected but the Meter display does not show the measured value, which I had expected.

Is there a setting change or a command change I need to make to make this happen?

Dave.

I am using a DAQ6510 stuffed with 7701 + 7707 boards in an ATE application. Everything works as expected but I cannot find how to have the meter display show the resistance values measured via the 7707 board. Please note that the measurements happen as and when expected and are the correct values returned to my control code - my only issue is that they are not display on the DAQ6510 screen at the point they are taken.

How do I display these readings?

Thanks.