Service manual

Example: 4-Wire
Ohms Test
This example performs a 4-wire ohms resistance test for a power line
reference frequency of 60 Hz. Change line 80 to OUTPUT
70903;"CAL:LFR 50" for 50 Hz operation.
The program also calculates the Upper Limit and Lower Limit values for
ACTUAL Resistance Standard resistance value (lines 170-190). If the
actual Resistance Standard value is different than 1kΩ, 100kΩ, or 1MΩ,
replace the Lower Limit and Upper Limit values shown in Table 4-1,
Performance Test Record for the Agilent E1411 Multimeter, with the values
computed by the program.
1 !4-Wire Ohms Performance Verification
10 OPTION BASE 1
20 DIM Range(3),Source(3),Read_meas(3),Limit(3),Ohms(3)
30 DATA 1861, 119156, 1048576
40 READ Range(*)
50 DATA 1000, 100000, 1000000
60 READ Source(*)
70 OUTPUT 70903;"*RST" !Set autozero on and PLC 1
80 OUTPUT 70903;"CAL:LFR 60" !Set 60 Hz line ref frequency
90 FOR I=1 TO 3
100 PRINT "1. Set Resistance Standard to";Source(I);"Ohms"
110 PRINT "2. Measure ACTUAL Resistance Standard value (in Ohms)"
120 PRINT "Enter ACTUAL Resistance Standard value (in
Ohms)",Ohms(I)
130 CLEAR SCREEN
140 OUTPUT 70903;"CONF;FRES";Range(I)!Set 4-wire ohms, range
150 OUTPUT 70903;"READ?"
160 ENTER 70903;Read_meas(I)
170 IF I=1 THEN Limit(I)=.00025*Ohms(I)+2.0E-2 !2 kOhm limits
180 IF I=2 THEN Limit(I)=.00025*Ohms(I)+1 !131 kOhm limits
190 IF I=3 THEN Limit(I)=.00025*Ohms(I)+10 !1 MOhm limits
200 NEXT I
210 PRINT "Measured Source Low Limit High Limit"
220 PRINT "Resistance Resistance (Ohms) (Ohms)"
230 PRINT
240 Format:IMAGE 7D.3D,6X,7D.3D,6X,7D.3D,6X,7D.3D
250 FOR I=1 TO 3
260 PRINT USING Format;Read_meas(I),Ohms(I),Ohms(I)-Limit(I),
Ohms(I)+Limit(I)
270 NEXT I
280 END
Agilent E1411A/E1411B Service Manual Verification Tests 29