KYOWA MRS-100 Series Instruction Manual page 18

MEMO
●Conditions for a successful sensor check
Sensor checking uses the tip parallel resistance method, as shown in the following bridge schematic diagram. The
transmitter incorporates a parallel resistance value (Rs) and switch. Turning on the switch increases strain output.
When this increase is within the range indicated in the last line of the following table, the sensor check is
successful.
Description
Rg bridge resistance
Rs Parallel resistance value
k Gage Factor
Generating strain value
St based on tip parallel
resistance method
SW Switch for sensor check
sensor check
St0
Strain output when off
sensor check
St1
Strain output when on
Increased strain output
St1–St0
value
Conditions for a successful sensor check: 0.7 × St < St1 − St0 < 1.3 × St
• When Rg = 350 ohm: Based on St = 484.3 × 10
• When Rg = 120 ohm: Based on St = 166.1 × 10
NOTE
●Analog output from a successful sensor check
• If S
in the preceding MEMO has not been changed
t0
after Balance adjustment, the value will return from
2.5 V to 0 V as shown in the figure at right.
• If S
has been changed after Balance adjustment, the
t0
value will not return from 2.5 V to 0 V as shown in
the figure at right.
Remarks
Rg≒Rg1≒Rg2≒Rg3≒Rg4
The bridge being used must be entered in
the Setting Software.
Rs = 361 kohm (in the transmitter)
k = 2.00
Rg 1
 
St
 

k Rg Rs
On when a sensor check is performed
(Switch is in the transmitter)
When sensor check is off
(Strain output for normal measurement)
When sensor check is on
(Switch is on [shorted])
Additional strain output when a sensor
check is performed
-6
strain,
< St1 − St0 < 629.6 × 10
-6
339.0 × 10
-6
strain,
< St1 − St0 < 216.0 × 10
-6
116.3 × 10
 
Rg Rg
 
 
≒
1
 
･
k Rs Rs
-6
strain
-6
strain
+2.5 V (when the sensor
check is successful)
0 V (after Balance adjustment)
+2.5 V (when the sensor
check is successful)
0 V (after Balance adjustment)
17
SW
Rs
Rg4
Rg1
Rg3
Rg2
C(-BV)
A(+BV)
For five
seconds
For five
seconds
D(+IN)
St0
B(-IN)
Amount
of change