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－１２１－
21. MAINTENANCE
21.3 Measured Values Check
It is recommended for check measured values once a year for maintaining the measuring and printing
accuracy.
1 Channels to be checked
Check the measured value for each channel.
Different errors may occur for different channels
even in the same range.
To check a channel for which a math-function
or totalization (optional) has been
programmed, program the math expression to
“
” before starting the checking.
(Note) Add ±0.01% per 1°C for a case other than
23 ±2°C.
2 Preparation
1) Preparation of tools
Input types
To o l s
DC voltage
T
hermo-coupl
e
Resistance
thermometer
Remarks
DC standard
voltage/current generator
{ {
Accuracy: Should be better
than ±0.05%.
Reference junction
compensator
{
0°C ±0.2°C
Thermocouple for test
{
Same type of thermocouple as
input type
Standard variable resistor
{
Accuracy: Should be better
than ±0.05%.
3-core copper wire
{
Three copper wires shall have
the same resistance values.
2) Connection
Connections depend upon the input types. See the next page.
3) Before starting adjustments
(1) Mount the terminal board cover and turn on the power supply.
(2) Before starting adjustments, warm up your recorder for at least 30 minutes until it becomes stable. (It is
recommended to warm up for at least one hour if possible.)
Check and adjustments of the measured values need meticulous work in addition to the standard tools and
reference conditions.
If you need checks or adjustments of the measured values, please consult your nearest CHINO’s agent.
Totalization channel
Remarks
Items Reference conditions
Ambient
temperature
23 ±2°C
Ambient humidity
55 ±10%RH
Power voltage
100 V AC ±1%
Power supply
frequency
50 or 60 Hz ±0.5 Hz
Reference conditions
Checking
Remarks