RIGOL
© 2008 RIGOL Technologies, Inc.
Programming Guide for DM3000 Series
4-3
Example 2 : Elimination of test impedance error
Purpose:
To eliminate impedance error of test down-lead
In measuring the smaller resistance, the impedance of test down-lead leads to error.
So uses should eliminate the impedance error of test down-lead before measuring.
The programming steps:
0
*RST
/*reset */
1
*IDN?
/*query equipment ID*/
2
:function:resistance
/*turn on 2WR measue function*/
3
:measure:resistance
□
MIN /*set the two circuits resistance range as 200Ω*/
4
/*at the times, please connect the red and black table T for measuring
resistance*/
5
:calculate:function
□
AVERAGE /*turn on AVERAGE calculation function*/
6
:calculate:statistic:average? /*query the average resistance*/
7
/*note the resistance value: 3.302198e-01 */
8
:calculate:function
□
NULL /*turn on NULL calculation function*/
9
:calculate:NULL:offset?
/*query the NULL calculation offset, and use it for
examining the equipment*/
10
/*here , the return value is 0*/
11
:calculate:NULL:offset
□
0.330219 /*set offset as 0.330219*/
12
:calculate:function
□
NULL
/* set NULL calculation with the above
offset*/
13
:calculate:function
□
AVERAGE /*turn on AVERAGE calculation function*/
14
:calculate:statistic:average? /*query the average resistance*/
15
/*the returned value is 3.173456e-04*/
Remark:
1.
Before sending the fifth command, to do send the fourth commad.
2.
The fifteenth line shows: the above calculation lowers the error three orders. And
the test to eliminate the impedance error of test down-lead is successful.
