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ne
Leet
3-79
Bipolar Mode
3-80
Calibration. The ZERO ADJUST allows the nega-
tive limit to be set to —10V when the 59501B is programe
med to zero (2000). The D/A FULL SCALE ADJUST
allows the positive limit to be set to +9.98V when the
59501B is programmed to maximum (2999). This range
results in a resolution of 19.98V/999 or 20mV per program-
ming step. Calibration procedures for operating in the
bipolar mode are provided in paragraph 5-30.
3-81
Sample Program.
A sample program for control-
ting the bipolar output of the 59501B
is given in example
7. This program is similar to the unipolar mode program
given in example 8 except that it allows keyboard input
of bipolar voltage from —10V to +9.98V.
Example 7. 9825A Sample Program, 59501B Bipolar Output
[ai
Week
g
MEEI IA
i:
2:
ta
BIPOLAR" iste
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as
ap
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sztp
a
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PRO
C184
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gap
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for
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7
Tan
ii
dat
Us
OS
bep
Wo
desired
outeut
wo
tage
p Vsus
"Mes DL
ey
F
ape
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3
and
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»
SE
be TD
S.
reaR
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ls Heat
il
Explanation:
Sets fixed point format with three digits to the right of the decimal.
performing the adjustment specified in line 8.
This allows for better accuracy when-
2:
Setup instruction.
3-10:
Calibration routine using ZERO ADJUST and D/A FULL SCALE ADJUST controls on the 59501B.
Note
.
that in line 7, an average value is calculated.so that the adjustment can be completed in the minimum number
of steps.
AY:
User inputs desired output voltage (—10
to +9.98} on keyboard.
12:
{f the voltage requested is too high, 'Voltage too i
appears on the display for three seconds, and then
the program returns to line 11.
13-14:
Proper range is selected and correct data word value (N) is calculated.
15:
Data word (NY representing the desired positive or negative output voltage is sent to the 59501B . Format
{4.0 deletes leading spaces and z suppresses carriage return/line feed characters.
If leading spaces are not
deleted and CR/LF characters are not suppressed, the output will go to an undesired value (see paragraph 3-34).
3-19
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