User's Manual

DPC/TRACK Essentials
Interpreting Data
2
2-11
before taking any action. Somewhere in the middle is a safe and efficient
environment for both your personnel and your process. Drift Plots help you find
this middle ground.
Per device, a Drift Plot illustrates the maximum As-Found deviation relative to the
test dates for all associated Test Results records. For a given device on a regular
testing schedule, if the As-Found maximum deviation is consistently too big, then
the device probably needs to be looked at more often. Sure, you could manually go
through all the Test Results for all your Tag IDs and compare the numbers to
determine this for yourself. But why not just click a button instead?
1. Select the Tags/Instruments button on the Main Menu to access the
Instrument Search screen.
2. Enter “SAMPLETAG2” (excluding the quotes) in the Tag ID field and press
the Search button. The Instrument View screen appears.
3. Click on the Tag ID History tab. Notice that four Test Results records for
this Tag ID now appear on the screen, as well as a Drift Plot button.
4. Select the Drift Plot button to produce a drift plot for SAMPLETAG2.
5. Select the Close button to close the graph. Then choose the Done button to
return to the Instrument View screen. From here, select the Main Menu
button to return to the Main Menu.
The handful of sample records really don't illustrate the value of a Drift Plot. In
our case, there are only four Test Results records associated with SAMPLETAG2.
You’ll eventually have dozens or hundreds of results per Tag ID on which to base
a drift plot.
Note
If you have binary test results, they will not be shown on the Drift
Plot. For those devices that have only binary test results, you will not
be able to produce a Drift Plot.