Chino AL3000 SERIES, Инструкция по эксплуатации

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19-3
19.3. Measuring Values Check
It is recommended for maintaining the measuring accuracy rating to check measuring values once every
year.
1. Channels to be checked
Check measuring values for each channel.
Errors may be different between channels even
in the same range.
2. Preparation
1) Preparation of tools
Input types
Tools
DC
voltage
Thermocouple
Resistance
thermometer
Remarks
DC standard
voltage/current generator
○ ○
Accuracy: Shall 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: Shall be better than
±
0.05%
3-core copper wire
○
Three lead wires shall have the
same resistance value.
2) Connections
Connections depend upon the input types. See the next page.
3) Before starting check
○
1
Mount the terminal board cover and turn on the power supply.
○
2
Warm up the instrument for longer than 30 minutes until it is stabilized before starting check.
(It is recommended to warm up the instrument for longer than one hour.)
Items Reference conditions
Ambient temperature
(Note)
23
±
2°C
Ambient humidity 55
±
10%RH
Power voltage 100VAC
±
1%
Power frequency 50 or 60 Hz
±
0.5%
(Note) Add
±
0.01% /1°C when the ambient
temperature is other than 23
±
2 °C
Reference conditions during check
Check channels set to the mathematical
function and/or totaliser (any of them
optional) after once set the mathematical
function to "non".
In case of math and/ or
totalising channels
Remarks
Checking and adjustment of measuring values work require careful work with a standard tool and
other tools employed under the reference conditions.
For asking us for the checking and adjustment of measuring values, please contact our sales agent.
Check
Remarks