77
Load resistance
Standard resistance
DC power supply
HHC
Digital voltmeter
Calibration procedure
(1) Make wiring according to the diagram below.
Connect DC power supply (power source), digital voltmeter (measuring device), standard
resistance and HHC (Hand Held Communicator):
When current is measured with an ammeter connected to CK+ and CK – terminals, the in-
ternal resistance of the ammeter should be 12
Ω
or less.
(2) Calibration of output circuit D/A :
This Menu has to be used to change the output signal values corresponding to zero and
100% of the output signal. No pressure generator is required (refer to pages 32 and 33)
(3) Zero/span adjustment:
(refer pages 30,31 and 34)
(4) Accuracy test
Apply input pressures in the order of 0%, 25%, 50%, 75%, 100%, 75%, 50%, 25% and 0%,
and read output at each input pressure.
Make sure the difference between each output value and input pressure (%) is within the
accuracy rating listed in the table below.
The voltage values in the table are dependent on use of “DC power standard resis-
tor 250
Ω
+ digital voltmeter (measuring device).
Measurement
Reference
Accuracy (according type)
category
value
Accuracy : 0,1%
Accuracy : 0,2%
Percent display % 0, 25, 50, 75, 100
±0,1
±0,2
Current
4, 8, 12, 16, 20
±0,016
±0,032
measurement (mA)
Voltage
measurement (V)
1, 2, 3, 4, 5
±0,004
±0,008
On load resistor
of 250
Ω
For communicate correctly with the FXW (HHC), a load resistor of 250
Ω
mini is required.
INDICATION
