AnsweredAssumed Answered


Question asked by VRFuser on Jul 24, 1996
from: Greg Goebel / HP-MXD / 970-679-3030 / FAX 970-679-5971
to:   Claudio de Diana
date: Thursday, 25 July 1996 1337 MDT


I am afraid the 4142 is a rather specialized device and we neither have one
in VEE support nor would understand it well if we did.

I will copy the relevant support person for the 4142 (at another HP division)
to see if he has comments.

I should warn you that if you are trying to generate curve-trace sets with
VEE and the 4142, you will find it not particularly adequate for the task.
It can be used to do simple things, but the 4142 requires some intense
software to perform sophisticated semiconductor parameter analysis on VEE.
HP software packages are available for this purpose.

[%%] please stay in touch -- gvg

>      Dear everybody,
>      I am evaluating HP-VEE with my HP4142B, so I am a
>      newbye, the question that I pose is therefore
>      simple and I know that by the moment you reach the
>      end of this mail you will have the answer.
>      Apparently there are some situation in which
>      my HP4142B, used with HPVEE, gets shy, i.e. perform the
>      measurement and does not show me the data.
>      Basically I want to use the driver of the HP4142B
>      (dated 8/1/94 and ver 2.0) to build up a nice front panel,
>      setting the instruments with interactive dialog
>      and saving the results to a file.
>      I am able to do all of this in "Spot Mode" (a single
>      point measure) and therefore I could infere that all
>      the hardware works correctly.
>      If I try to do it in "Staircase Sweep" strange phenomena
>      occurs (do notice that I measure a resistor with a ramp
>      of 3-10 points, so very few data).
>      With the following 'program' [see end of the mail]
>      I am able to measure the resistor and, by clicking
>      on the display which is "built-in" in the driver,
>      I am able to see the ramp and reading
>      the values with the marker; so the data do exist!
>      (*)The first trouble is that when I add the "MEAS_READ" statement
>      in the aforementioned 'program' (as I used in the Spot case) then,
>      if I click on the display, a "timeout error" appears (do notice:
>      sweep of three points).
>      (**) If I try to wire something to the output, namely the variable
>      "TRACE_Y" what I see, on the Logging A.N. or if I probe the line,
>      is a nice Array 1D of "0", do notice that the size of the array
>      varies if I vary the number of steps of the Sweep.
>      This phenomena appears with or without the "MEAS_READ" statement.
>      The only difference is that, WITHOUT it, after having performed
>      the measurement and probed a nice set of n-zero, I am able
>      to click on the display of the driver and actually see the real
>      non zero value of my n-data.
>      Apparently this action "pushes" the data so that the next measure
>      will show no more "0" in the Log. A.N. but - forever - the results
>      obtained before the "push". Mah!?
>      Probably I am doing such a stupid and huge error that I am not
>      able to see it (I have got the evaluation copy, maybe is described
>      in the manuals) but before buying this software I'd like to be
>      sure that it works correctly and I am really puzzled by its
>      behaviour.
>      Best regards,
> Claudio De Diana --- email: ---
> voice (+49) 89 2892 3103    TU Muenchen                    
> fax   (+49) 89 2892 3134    Lehrstuhl fuer Technische Elektrophysik
>                          Arcisstr. 21                    
>                         80290 Muenchen                    
>                          Germany
> -------------------------------------------------------------------
> -------                      MIGA BAE !                     -------
> -------------------------------------------------------------------
>      Here is the "program" for us hp4142b fans:
>      slot2_enabled (1),channel_numbers(2),
>      MM(1),channel_number(2),number_of_steps<inputvariable>,
>      start_voltage<i.v.>,stop_voltage<i.v.>,i_compliance(high enough),
>      WV(1),BC(1),XE(1),[MEAS_READ(1)],DZ(1).