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Cardinal 205-DAC Installation Manual page 11

Digital to analog converter

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CALIBRATION OF ANALOG OUTPUT
The analog output has been calibrated at the factory and should require no other adjustment.
If, for some reason, it is found necessary or desirable to readjust this output, the procedure
listed below may be used.
In order to calibrate the analog output, it is first necessary to enter the Calibration mode by
gaining access to the calibration switch. Refer to the Setup and Calibration section of the
indicator manual for additional information.
The following prompts apply only if the 2XX-DAC board is installed.
dAC (dAC?) – Digital to Analog Converter
With dAC (dAC?) displayed, press the ENTER key. The display will change to show Lo=.
Lo=
Press the ENTER key to show stored value. This is the value, in weight, which outputs zero
volts (or 4 mA) from the DAC. All weight below this target will output zero volts (or 4 mA). If
the setting is acceptable, press the ENTER key again to save it. Otherwise, using the numeric
keys enter the desired weight value, then press the ENTER key to save it. Note that the
NET/GROSS key is used to change the weight sign. For example, to input –1000 as the
weight value, press 1 0 0 0 NET. Allowable values are: -99999 to 999999.
Hi=
Press the ENTER key to show the stored value. This is the value, in weight, which outputs the
maximum selected voltage and current (see oUt=). All weights above this value will output
maximum volts from the DAC. If the setting is acceptable, press the ENTER key again to save
it. Otherwise, using the numeric keys enter the desired weight value, then press the ENTER
key to save it. This weight must be a positive value, up to capacity of scale, and above the
Lo= value. Allowable values are: 1 to 999999.
oUt=
Press the ENTER key to show the stored value. This is the maximum output value in volts
(00.01 to 10.00). All weight values equal to or greater than Hi= will output this value. Note,
that if the scale goes OCAP (over capacity), this value is used also. If the setting is acceptable,
press the ENTER key again to save it. Otherwise, using the numeric keys enter the desired,
then press the ENTER key to save it. Allowable values are: 00.01 to 10.00.
NOTE! If the 4 to 20 mA current output is used, set oUt= to:
Current=
Adj Hi
This sets the DAC output to oUt= level for adjusting the level. Adjustment potentiometers
"pots" (10V and 20 mA) on the option board are used.
• Adjust the 10V pot for the maximum voltage output entered for oUt=.
• For 4 to 20 mA current output, adjust the 20mA pot for the calculated maximum current.
Press the ENTER key to proceed to the Adj Lo prompt, or the ASTERISK key to return to
the previous prompt.
MODELS 200/205/210/215
oUt=
x 16 + 4 (mA)
10
8200-M350-O1 Rev B • 2XX-DAC
(max current – 4)
10 x
(Can not be greater than 20 mA)
16
7

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