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11. DC VOLTS, AMPS, PROCESS, DC RATIO
The DC Volts, Amps, Process and Strain meters utilize the DC signal conditioner board, which
needs to be configured via jumpers for the desired voltage or current range. All signal ranges
are factory calibrated with calibration factors stored in EEPROM on the signal conditioner board.
The meter software recognizes the board and will bring up the appropriate menu items for it;
however, it does not recognize the jumper settings.
Board Revisions Q and R
Notes:
Position jumpers to cover the gaps marked by a letter. Store spare jumpers on unused
jumper posts. Please contact us for board revisions earlier than Q.
For DC voltmeters & ammeters
, a scale factor of 1 and an offset of 0 are used for direct read-
ings in (milli)volts or (milli)amperes. This may be displayed as 20.000 mA or 20000 µA. Decimal
point selection does not affect the displayed digits. Full-scale ranges are ±20000 counts. For
resolution purposes, the 300V and 600V ranges are 2000V (100 mV/count), and the 5A range
is 20A (1 mA/count).
Use with a current shunt
requires a scale factor to be set. For example, to display 500.0A
(5000 output counts) from a 100 mV shunt (10000 input counts in the 200 mV range), apply a
scale factor of 0.5 and an offset of 0. Three scaling methods are selectable: 1) Scale and offset,
2) Coordinates of 2 points, and 3) Reading coordinates of 2 points. Only menu items applicable
to the selected method are presented.
For use with load cells,
select 5V or 10V excitation and from the meter, set
_
InPut
to
_
rAtio
,
and set the range to 0.2V. The meter will then use the excitation voltage as the reference for A-
to-D conversion, thereby correcting for any variations in excitation voltage. The meter can drive
four 350-ohm load cells in parallel.
For use with potentiometers
where excitation and signal share the same ground, select 5V
(not 10V) excitation, set
_
InPut
to
_
rAtio
, and set the range to 20V. Again, the meter will use
the excitation voltage as the reference for A-to-D conversion, thereby correcting for any
variations in excitation voltage. Potentiometers are often used for length measurement.
Ranges
Jumpers
FS Voltage
E1
E2
E3
±200.00 mV
±2.0000 V
±20.000 V
±200.00 V
±300.0V (ETL)
±600.0V (not ETL)
A
A
B
B
B
B
f
f
h
h
g
g
b
a
b
a
a
a
FS Current
E1
E2
E3
±2.0000 mA
±20.000 mA
±200.00 mA
±5.000 A
A
A
A
A
e, g
d, g
c, g
a, b, g
b
b
b
b
