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40 Adjustments
When connected to the HP E1411 multimeter, some DC Standards may
exhibit voltage variations at the start of a measurement. TRIG:DEL .05 (line
190) adds a 0.8 sec wait before calibration begins to allow settling time for
the DC Standard output. TRIG:DEL .05 is used since the input is sampled
16 times before the calibration is performed. Thus, total delay added = 0.05
seconds x 16 = 0.8 seconds.
1
! DC Voltage Adjustments
10
OPTION BASE 1
20
DIM Range(10),Volts(10)
30
DATA 8.0, 8.0, 0.125, 0.125, 1.0, 1.0, 64.0, 64.0, 300.0, 300.0
40
READ Range(*)
50
DATA 7.7, -7.7, .121, -.121, .97, -.97, 62.0, -62.0, 300.0, -300.0
60
READ Volts(*)
70
OUTPUT 70903;"*RST"
80
OUTPUT 70903;"CAL:LFR 60"
90
FOR I=1 TO 10
100 Re_try: !
110
CLEAR SCREEN
120
PRINT "Set DC Standard to";Volts(I);"VDC"
130
PRINT "Press Continue when ready"
140
PAUSE
150
CLEAR SCREEN
160
OUTPUT 70903;"FUNC:VOLT:DC"
170
OUTPUT 70903;"VOLT:RANG ";Range(I) !Set E1411 range
180
OUTPUT 70903;"CAL:VAL";Volts(I) !Set CAL:VAL value
190
OUTPUT 70903;"TRIG:DEL .05"
200
OUTPUT 70903;"CAL?"
210
ENTER 70903 USING "K";Cal_code !Return cal error code
220
IF Cal_code <>0 THEN
230
PRINT "Calibration Error";Cal_code;"for ";Volts(I);"VDC input."
240
PRINT "Check source value/connections, then"
250
PRINT "press Continue to retry this adjustment"
260
PAUSE
270
GOTO Re_try
280
ELSE
290
PRINT "Adjustment complete for";Volts(I);"VDC input"
300
END IF
310
PRINT "Press Continue for the next adjustment"
320
PAUSE
330
CLEAR SCREEN
340
NEXT I
350
END
!Set autozero on and PLC 1
!Set 60 Hz line ref frequency
!Set DCV function
!Wait for settling
!Perform calibration
Chapter 5
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