Omega RD2800 Series User Manual page 125

21. MAINTENANCE
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.
Remarks Totalization channel
To check a channel for which a math-function
or totalization (optional)
programmed, program the math expression to
"  " before starting the checking.
2
Preparation
1) Preparation of tools
Tools
DC standard
voltage/current generator
Reference junction
compensator
Thermocouple for test
Standard variable resistor
3-core copper wire
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.)
Remarks Checking
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.
21.3 Measured Values Check
has been
Input types
Thermo-coupl
DC voltage
e
－１２１－
Reference conditions
Items Reference conditions
Ambient
23 ±2°C
temperature
Ambient humidity 55 ±10%RH
100 V AC ±1%
Power voltage
Power supply
50 or 60 Hz ±0.5 Hz
frequency
(Note) Add ±0.01% per 1°C for a case other than
23 ±2°C.
Resistance
thermometer
Accuracy: Should be better
than ±0.05%.
0°C ±0.2°C
Same type of thermocouple as
input type
Accuracy: Should be better
than ±0.05%.
Three copper wires shall have
the same resistance values.
Remarks