Example 2 : Elimination Of Test Impedance Error - Rigol DM3000 Series Programming Manual

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
1 *IDN?
2 :function:resistance
3 :measure:resistance□MIN
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?
7 /*note the resistance value: 3.302198e-01 */
8 :calculate:function□NULL
9 :calculate:NULL:offset?
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
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.
© 2008 RIGOL Technologies, Inc.
/*reset */
/*query equipment ID*/
/*turn on 2WR measue function*/
/*set the two circuits resistance range as 200Ω*/
/*query the average resistance*/
/*turn on NULL calculation function*/
/*query the NULL calculation offset, and use it for
/* set NULL calculation with the above
Programming Guide for DM3000 Series
RIGOL
4-3