Omega DP461-S, Руководство пользователя, Страница: 87 / 175

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8
Scaling to
Display
Engineering
Units
STRAIN
0
C. The unit comes with all lockout bytes set in the unlocked
position (“0”). Refer to Section 9.1 for information on lockout
bytes.
If the unit has been programmed previously make sure that at least
the following lockout bytes are unlocked. If they are Not unlocked
you will not be able to scale the meter.
MENU SUBMENU
“L1CNF” L1C.7=0, L1C.8=0
“L2CNF” All sub menus must be unlocked “0”
Scroll to the menu by pressing the ‘MENU’ button. Enter a
submenu by pressing the ‘MIN’ button. Select “0” or “1” by pressing
the ‘MAX’ button. Always press the ‘MENU’ button when leaving
a submenu to store the values you entered.
METHOD I: SCALING WITHOUT SIMULATING A KNOWN LOAD.
All of the following steps are accomplished by using the front panel
buttons.
1. Scale the instrument by entering only 3 parameters. The 3
parameters are “RDG SC” (Reading Scale), “RDG OF” (Reading
Offset), and “DEC PT” (Decimal Point).
Calculate “RDG SC” using the following formula:
RDG SC= display span/((sensor’s output span) (natural gain))
RDG SC= 200/(10 x 10000) = 0.002
Where: display span= 200 – 0 = 200
Sensor’s output span= 10 volts
Meter’s natural gain= 10000 (from Table 8-5)
TABLE 8-5
METER’S NATURAL GAIN CHART
VOLTAGE SENSOR’S METER’S
RANGE OUTPUT UNITS NATURAL GAIN
100 mV,
±
50 mV Millivolts 1000
1 V,
±
500 mV Millivolts 100
10 V,
±
5 V Volts 10000
100 V,
±
50 V Volts 1000