Help combining output data from an HP4140B and a LakeShore 330
Hi!
First of all, I would like to apologize if this question has already been answered in the forums, but I haven't been able to find anything for this particular situation... I am using LabView v.8.6 so as to conduct TSC (thermally stimulated current) measurements, by controlling a Lake Shore Cryotronics 330 (Lake Shore Model 330 Autotuning Temperature Controller) and a HP4140B pA meter. I am taking as a starting point the VIs available in the driver libraries (http://sine.ni.com/apps/utf8/niid_web_display.download_page?p_id_guid=014FB74E7B0C1ED3E0440003BA7CCD... and http://sine.ni.com/apps/utf8/niid_web_display.download_page?p_id_guid=E3B19B3E92C3659CE034080020E748..., respectively), and I would like to merge both programs ("Lake Shore Cryotronics Controller Output.vi" and "HP4140B Example (current vs. voltage).vi") into a single program that can simultaneously record both the current values (at a fixed voltage) from the HP4140B and the temperature as it is changed in the 76K to 300K range (with the Lakeshore 330).
The problem lies in the fact that I don't know how to make compatible the numeric output "Sample sensor data" of the Lakeshore with the numeric array (which does not have a defined size) named "current/cap" of the HP4140B in aforementioned programs. What I am trying to do is to: (1) save the data to a file (I have attempted using "Write to measurement file" Express block, which I am not sure of whether it's the best option or not); and (2) plot current vs. temperature (not current vs. time and temperature vs. time separately).
Any help with these issues would be most appreciated, since I'm stuck on my research because I can't record any data! This really goes right over my head...
PS: I enclose the file that I have been working on, but perhaps it's better to work from scratch (I'm still a newbie and I may have made errors!)
Solved!
Go to Solution.
Attachments:
Current_vs_Temp.vi 69 KB
Kyle,
Thank you for your response and sorry for having taken a while to reply, but the equipment is shared with other groups and I haven't had access to it in a while.
I have managed to get the program running using LabVIEW 7.1 (I don't know why, but the HP4140B drivers don't seem to be compatible with LabVIEW 8.6) and using the "HP4140B Read Single Meas.vi" example (and not "HP4140B Read Wave Meas.vi", as I had tried before) so as to get a double instead of an array, avoiding synchronization problems when merging data from the HP4140B and the LakeSHore 330. Then I have used a do-while loop to get "continuous sampling" of the waveform. Nonetheless, because of having chosen this approach, now I can only use a fixed voltage, which would be of for a TSC measurement, except for the fact that I need to increase the voltage in small steps so as to avoid damaging the sample. I am using another do-while loop so as to keep increasing the voltage gradually (and also be able to update the LakeShore 330 parameters), and once the desired voltage is achieved, I press a "stop" button, allowing the program to flow into the next stage and take the measurements... I am aware that it's not an elegant solution, so if you can come up any ideas for an improved version, it would be most appreciated!
Regards,
Pablo
Attachments:
IvsTemp_LabVIEW7_final.vi 267 KB
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Linda Li
Linda Li
TechNet Community Support -
Reading Data from Unix file and write into an Internal table
Dear all,
I am having an requirement of reading data from unix file and write the same into an internal table..how to do that ...experts please help me in this regard.Hi,
do like this
PARAMETERS: p_unix LIKE rlgrap-filename OBLIGATORY.
DATA: v_buffer(2047) TYPE c.
DATA: BEGIN OF i_buffer OCCURS 0,
line(2047) TYPE c,
END OF i_buffer.
* Open the unix file..
OPEN DATASET p_unix FOR INPUT IN TEXT MODE.
<b>IF sy-subrc NE 0.
*** Error Message "Unable to open file.
ELSE.</b>
DO.
CLEAR: v_buffer.
READ DATASET p_unix INTO v_buffer.
IF sy-subrc NE 0.
EXIT.
ENDIF.
MOVE v_buffer TO i_buffer.
APPEND i_buffer.
ENDDO.
ENDIF.
CLOSE DATASET p_unix.
<b>Reward points if it helps,</b>
Satish -
Function module to derive start and end dates from fiscal year and period.
Hi,
I want to know a function module to derive start and end dates from fiscal year and period.
ie: If I have say fiscal year '2010' and period '07', then the start date of this period would be '01.10.2010'.
Thanks.
Moderator Messge: Basic Date questions are not allowed.
Edited by: kishan P on Oct 18, 2010 4:45 PMHi,
This is one of my exit that display the calmonth (offset -12). Usefull when I have to retrieve in a KF a complete rolling year depending one calmonth.
S_VMUCMN is my selection variable
S_TXTCMN_M12 is my text variable calmonth-12
S_TXTCMN_M0 is my text variable for selected calmonth.
WHEN 'S_TXTCMN_M12'.
IF i_step = '2'.
LOOP AT i_t_var_range INTO loc_var_range WHERE vnam = 'S_VMUCMN'.
CLEAR l_s_range.
" First day of the selected month
CONCATENATE loc_var_range-low '01' INTO l_calday.
CALL FUNCTION 'YFRBW_FUM_CAL_DATE_IN_INTERVAL'
EXPORTING
date = l_calday
months = 12
signum = '-'
IMPORTING
calc_date = l_calday.
l_s_range-low = l_calday+0(6).
l_s_range-sign = 'I'.
l_s_range-opt = 'EQ'.
APPEND l_s_range TO e_t_range.
EXIT.
ENDLOOP.
ENDIF.
Thus, in KF header you have to put the two text variable to display the complete period.
Hope it helps,
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