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19-34
IM 701210-06E
Item
Specifications
Precautions
• Highly sensitive measurements are made in the
µ
V level in strain measurements. Therefore, take
measures against noise at the strain sensor perimeter, bridge head, and cable wiring.
• Depending on the noise environment, an error may result in the balance. Check the influence
before making measurements.
• The bridge head specified by YOKOGAWA has high noise resistance.
• When executing shunt calibration, be sure to calculate the shunt resistance in advance, and
execute it in a range so that the measured values do not exceed the range even when the shunt
resistance is ON.
• Some of the strain gauge sensors and bridge heads made by other manufacturers do not have
sensing wires connected. (No such problems with bridge heads made by YOKOGAWA.) If such
products are used, an error may result in the bridge voltage leading to measurement errors,
because sensing does not work effectively. Perform sensing as close to the bridge head as
possible. (There is no conversion cable for sensing on D-Sub connector types.)
• The connector shell is connected to the case potential.
• When a bridge head (701957 or 701958) is used, the connector shell, cable shield, and the
bridge head case are all connected to the case potential of the DL750/DL750P.
• When a bridge head (701957 or 701958) is used, the floating GND is connected to the bridge
head case inside the bridge head.
• Be sure to execute balancing again when you change the range or the bridge voltage.
1.
Value measured under standard operating conditions (section 19.11).
2.
Typical value represents a typical or average value. It is not strictly warranted.
Module front View
1
2
3
4
5
6
7
8
9
1: Floating common
2: Sense- (positive bridge voltage sensing)
3: Shuntcal- (negative shunt signal)
4: S (positive shunt signal)
5: Sense+ (positive bridge voltage sensing)
6: Bridge- (negative bridge voltage)
7: Input- (negative measurement signal)
8: Input+ (positive measurement signal)
9: (positive bridge voltage)
WARNING
• Do not apply input voltage exceeding the maximum input voltage, withstand
voltage, or allowable surge voltage.
• To prevent the possibility of electric shock, be sure to furnish protective earth
grounding of the DL750/DL750P.
• To prevent the possibility of electric shock, be sure to fasten the module screws.
Otherwise, the electrical and mechanical protection functions will not be
activated.
• Avoid continuous connection under an environment in which the allowable surge
voltage may occur.
19.12 Module Specifications