Connect-Tek Transa PRO 17 Manual de Instruções descarregar pdf (Página 60)

Step 8

Press the scroll key until the display shows . Send a 10V

signal to terminals 15 and 16 with the correct polarity. Press the

scroll key for at least 3 seconds. The display will blink for a

moment until a new value is obtained. If the display didn’t blink

or if the obtained value is equal to -199.9 or 199.9, then calibra-

tion failed.

• Perform step 9 to calibrate mA function ( if required ) for input

Step 9

Press the scroll key until the display shows . Send a

20mA signal to terminals 15 and 16 with the correct polarity.

Press the scroll key for at least 3 seconds. The display will blink

for a moment until a new value is obtained. If the display didn’t

blink or if the obtained value is equal to -199.9 or 199.9, then

calibration failed.

• Perform step 10 to calibrate offset of cold junction compensa-

tion, if required. Set the DIP switch for T/C input.

Step 10

Set up the equipment according to

the following diagram to calibrate

the cold junction compensation.

Note that a K type thermocouple

must be used.

The 5520A calibrator is configured for K type thermocouple out-

put with internal compensation. Send a 0.00°C signal to the unit

under calibration. The unit under calibration is powered in a still-

air room with a temperature of 25±3°C. Allow at least 20 min-

utes to warm up. The DIP switch is located at the TC input.

Perform step 1 as stated above, then press the scroll key until the

display shows

Press the up and down keys until a value

of 0.00 is obtained. Press the scroll key at least 3 seconds. The

display will blink for a moment until a new value is obtained. If

the display didn’t blink or if the obtained value is equal to -5.00

or 40.00, then calibration failed.

• Perform step 11 to calibrate the gain of cold junction compen-

sation if required. If a test chamber for calibration is not avail-

able, perform step 11N to use a nominal value for the cold junc-

tion gain.

Step 11

Set up the equipment the same as in step 10. The unit under cal-

ibration is powered in a still-air room with a temperature of

50±3°C. Allow at least 20 minutes to warm up. The calibrator

source is set at 0.00°C with internal compensation mode.

Perform step 1 as stated above, then press the scroll key until

the display shows

Press the up and down keys until a

value of 0.0 is obtained. Press the scroll key for at least 3 sec-

onds. The display will blink for a moment until a new value is

obtained. If the display didn’t blink or if the obtained value is

equal to -199.9 or 199.9, then calibration failed. This setup is

performed in a high temperature chamber, therefore it is recom-

mended to use a computer to perform the procedures.

Step 11N

Perform step 1 as stated above, then press the scroll key until the

display shows . Press the up and down keys until a value

of 0.1 is obtained. Press the scroll key for at least 3 seconds. The

display will blink for a moment until the new value 0.0 is

obtained. Otherwise, calibration failed.

Caution: It is not recommended to use step 11N, since the

cold junction gain is not able to achieve the rated accuracy using

this step.

• Final step

Step 12

Set the DIP switch to your desired position (refer to section 1-3).

Automatic calibration procedures

The programming port (see section 2-18) of the TEC-9300 can

be used for automatic calibration.

The equipment required for automatic calibration is available

upon request.

Manual calibration procedures, continued…

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Connect-Tek Transa PRO 17 Manual de Instruções Página 60

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