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——RIGOL Commands:
0 *RST /*Reset the instrument for preparing measurement*/
1 cmdset□rigol /*Select RIGOL commands*/
2 *IDN? /*Query equipment ID to confirm if the instrument
works normally*/
3 /*Return: RIGOL Technoligies, DM3058, DM3A020080808, 99.00.00.00.00.00*/
4 :function:resistance /*Enable resistance measuring function*/
5 :measure:resistance□MIN /*Set the measuring range of 2-wire resistance to
200 Ω*/
6 /*Short-circuit the red and black test lead which are used for resistance
measurement*/
7 :calculate:function□AVERAGE /*Enable average calculation function*/
8 :calculate:statistic:average? /*Query the average resistance*/
9 /*Note the returned value: 3.302198e-01 */
10 :calculate:function□REL /*Set relative operation function*/
11 :calculate:REL:state□ON /*Enable relative operation function*/
12 :calculate:REL:offset? /*Query current relative offset which is used to
check the instrument*/
13 /*zero should be returned*/
14 :calculate:REL:offset□0.330219 /*Set the measured offset as the relative
offset*/
15 :calculate:REL:state□ON /*Use the new offset to perform the relative
operation*/
16 :calculate:function□AVERAGE /*Enable average calculation function*/
17 :calculate:statistic:average? /*Query the average resistance*/
18 /*The new measured value: 3.173456e-04*/
Remarks:
1. Execute the operations described in line 6 before sending command line 7.
2. The result shown in line 18 indicates that after the relative operation, the
measured resistance value reduced 3 magnitudes (from -01 to -04).
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