Moore Industries TDY, User Manual

Page: 18 / 34

TDY
18 Demand Moore Reliability
Trimming the Input
Use this feature of the TDY to enhance the accuracy
of the transmitter by precisely matching its actual
reading of the input to its scaling of the either one
or two input points. Trim the output by following the
directions below:
1. Connect the transmitter to your PC using the
setup shown in Figure 2.
2. Click the radio button labeled “Input Trim On”.
3. Click “Start”, then “InpTrim”.
4. Select whether you will trim two points (upper
and lower) or just one point by clicking on the
appropriate radio button in the “Trim Pnts”
section.
5. In the “Trim Lower” and “Trim Upper” boxes,
type in the sensor’s value that you are
trimming.
6. Attach the sensor that you wish to trim to the
transmitter and place the sensor in a calibration
bath. Adjust the bath until its temperature
matches the “Trim Lower” value you have
chosen. Click “Trim Lower” and wait for it to
capture the value.
7. Attach the sensor that you wish to trim to the
transmitter and place the sensor in a calibration
bath. Adjust the bath until its temperature
matches the “Trim Upper” value you have
chosen. Click “Trim Upper” and wait for it to
capture the value.
8. Click on the button labelled “QuiInTrim”, then
the “Stop” button, and finally the “Prog” button
to send the trim values to the transmitter.
Trimming the Output
The TDY has a function that allows precise control
over its output. Note that to activate this function, a
unit must be connected in the setup to current meter,
as shown in Figure 2.
To trim TDY output:
1. Set all unit parameters on the TDY Configuration
Screen as required for your intended application.
When the Configuration File shown on the screen
has been modified for your application, click “Stop”
to stop measurement.
2. Click “OutTrim”.
3. Select and move the “Zero Scale Output” or the
“Full Scale Output” slide bar to adjust the TDY
output.
Monitor the output with a calibrated current meter
or with a voltmeter measuring the drop across a
precision, 250 Ohm resistor (see Figure 2).
4. When both zero and full scale have been adjusted
to satisfaction, press “QuitTrim”, then “Prog” to
program the SIY with the new trim values.
Note:
Changing the settings shown on the screen
in
“Trim”
mode DOES NOT CHANGE THE
UNIT’S OPERATING PARAMETERS, it only
updates the screen. The settings are saved
to non-volatile memory by using the “
Prog
”
function.
The “TDY Status” area of the Configuration Screen
will reflect the new output settings.
Figure 9. Trim Capture Box