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.
Remarks Totalization channel
To check a channel for which a
Reference conditions
Items | Reference conditions | ||
Ambient | 23 | ±2°C | |
temperature | |||
|
| ||
Ambient humidity | 55 | ±10%RH | |
Power voltage | 100 V AC ±1% | ||
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.
2
Preparation
1) Preparation of tools
Tools |
| Input types |
|
| Remarks |
|
|
DC voltage | Resistance |
|
|
| |||
| e | thermometer |
|
|
|
| |
|
|
|
|
|
| ||
DC standard | { | { |
| Accuracy: Should | be | better | |
voltage/current generator |
| 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%. |
|
| |||
|
|
|
|
|
| ||
|
| { | 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.)
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.
－１２１－
