Hioki 8860-50, Instruction Manual

Page: 140 / 490

5.4 Converting Input Values (Scaling Function)
128
When a calibration factor is stated in the sensor’s inspection records
It can be incorporated in the conversion ratio setting on the [Scaling] page (p.
131) of the Channel Settings screen.
The value of the calibration factor (0.001442 [G]) is set as the conversion ratio.
(* 10
-6
strain = µ
ε
)
Using a strain gauge with a Gauge Factor other than 2.0
When using a strain gauge, the Gauge Factor needs to be set as the conversion
ratio. For example, if the Gauge Factor is 2.1, the conversion ratio is 0.952 (2÷
2.1).
The scaling (conversion ratio) needs to be calculated to include both Gauge Fac-
tor and physical value conversions. In this case, the conversion ratio setting is
the product of the conversion ratios of the Gauge Factor and measurement unit
scaling.
The Gauge Factor component of the conversion ratio is 0.952, and the physical
value component is 0.001442*
Conversion Ratio = 0.952 × 0.001442 = 0.0013728
As in Example 3, enter [0.0013728] as the conversion ratio in the [Scaling] dialog
on the [Scaling] page.
* To convert measurement values to physical values when using a strain gauge,
calculate using the Young’s modulus or Poisson’s ratio of the measurement
object. The conversion method depends on the conditions in which the strain
gauge is used.
See "Appendix 2.7 Scaling Method When Using Strain Gauges" (p. A43)
Example 3.
Measure using a sensor with a calibration factor of 0.001442 G / 1 × 10
-6
strain*, and display the measured data in [G] units.
[Scaling] Dialog
1
Press the SHEET/PAGE keys to
select the [Scaling] page.
2
Move the cursor to the [Ch] column
of the channel to be set, and select
F1 [All Settings] .
The [Scaling] dialog appears.
3
Set as follows:
4
Press the ENTER key or move the
cursor to the [Close] button and
press the F1 key.
The settings are accepted.
Setting Items Setting Choice
Scaling On
Format Decimal
Units G
(Scaling Method) Ratio
Ratio
(Conversion
ratio) 0.001442 [G]
(displays as
1.442 m)
[Ch] Column
[Scaling] Page on Channel Settings Screen
Example 4.
Measure using a strain gauge (2.1 Gauge Factor), and display the mea-
sured data in [G] units.