Chapter 9 – Maintenance
TestEquity 101H Temperature/Humidity Chamber
Page 79
F4T Controller Calibration
2
CAUTION:
Calibrating the F4T Controller requires the electrical compartment to be
exposed. Live and potentially lethal voltages will be present. Use extreme
caution to prevent injury and death.
!
CAUTION:
The Power button on the F4T Controller must be OFF (no green check mark)
when performing the calibration procedure to prevent a thermal runaway
condition.
Equipment Required
•
Precision Resistance Source, 50.00
Ω
and 350.0
Ω
for Temperature Sensor.
•
Precision Milliamp Source, 0.000 mV and 20.000 mA for Humidity Sensor.
•
Precision Voltage Source, 0.000 mV and 50.000 mV for Limit Sensor.
Input Setup and Calibration
Make sure the Power button on the F4T Controller is OFF (no green check mark) before
performing the following. Disconnect the chamber from the power source and remove the top
cover. See F4T diagram on the next page for the terminal locations.
For Temperature Sensor Input Calibration
•
Remove the wires from terminals R1, T1 and S1 on F4T Slot 1
•
Connect the Precision Resistance source as follows:
One lead to R1 on Slot 1
Other lead to T1 and S1 on Slot 1
•
Reconnect the chamber to the power source and turn the Power switch on the front panel ON.
The Power button on the F4T must remain OFF.
•
To enter the Calibration menu, press the Menu button, then the Service button, then the
Calibration button, then the Temperature Sensor “Actions” button. Next, press Perform Field
Calibration and follow the on-screen prompts.
For Humidity Sensor Input Calibration
•
Remove the wires from terminals T1 and S1 on F4T Slot 4. (T1 is Red and S1 is Black)
•
Connect the Precision Milliamp source as follows:
+ lead to T1 on Slot 4
– lead to S1 on Slot 4
•
Reconnect the chamber to the power source and turn the Conditioning switch (or TEMP
switch depending on which model chamber you have) on the front panel to the Event 1
position. The Power button on the F4T must remain OFF.
•
To enter the Calibration menu, press the Menu button, then the Service button, then the
Calibration button, then the Humidity Sensor “Actions” button. Next, press Perform Field
Calibration and follow the on-screen prompt.
