Moore Industries THZ3 - Page 101

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User’s Manual
238-741-00K
May 2019
Programmable Smart HART Temperature Transmitter
THZ
3
/ TDZ
3
SECTION 5
AO Loop Current Test/Trim
A loop test may be performed in order to check output performance and accuracy and to trim
other instruments in the loop. Your output will be a current value, in mA, equal to the value you
input. You can check the other current devices on the loop and calibrate them to this signal .
In this menu you will see a read only Loop Current “Reading” and Status” this is the present
output current of device. The Output Test allows you to Set the Analog Output to a value
between 3.6-23.6mA.
In the Output Trim section you can trim the Analog Output. Use the Trim Mode to set to
either Disabled, One Point, or Two Point, click apply to set. Once set store conguration to
device. There is the Lower Output Range and Upper Output Range buttons, use these to
set your Trim value(in mA) using your voltmeter to measure the voltage drop across the 250Ω
resistor. A 4mA output will read as 1V across the resistor. Use the Trim button after entering
value in the Measured Output Current Field. You also have the option to reset trim to
Factory default. Once all trim
In the Clear Output Test section use the Clear button to return the Analog Output to its actual
value. The use the following steps to congure a One Point or Two Point Trim. Refer to
Figure 5.34
One Point
1. Navigate to the “AO Loop Current Test/Trim” page.
2. Select the Trim Mode (one point).
3. Click on the Apply button.
4. Send the “Store to device command”.
5. Click on the “Lower Output Range” button.
Note: This puts the AO in manual mode and the actual AO value is given.
6. Enter the given Analog Output value in mA in the “Measured Output Current” entry field.
7. Click on the “Trim” button.
8. Repeat steps 6-7 until the desired value is obtained.
9. Once the desired value is obtained, click on the “Clear” button.
Note: If you do not click the Clear button, the Analog Output will remain in manual mode and
will NOT follow the input signal.
10. You are done with one point trimming.