Using the OScope 8-8
This can be done before energizing the lines, while test switches are opened, test blocks pulled, or sliding
links are opened to disconnect field signals.
Note: Before performing an offset calibration or a slope calibration let the system run for
approximately 60 minutes. This will give the electronics time to achieve
temperature stability.
Note: When calibrating, be sure no signal is present by ensuring all Test Switches or
Sliding Links are open.
The time it takes to do an “all offset calibrate” is dependent on the number of channels but is usually less
than 20 seconds. The factory performs an offset calibration, with no signals attached, before a recorder is
shipped to you. After the system is installed and field wires are connected, you should perform
another offset calibration to eliminate the externally induced DC offset or the effects of DC offset
when someone changes an analog channel full scale.
To Calibrate Channel All Offsets
In the APP OScope window, from the menu bar, click Advanced, then Calibrate All Offsets.
After calibrating all offsets, we recommend reviewing each channel offset by stepping through the
channels in the Show Analog Channels section.
Note: After calibrating, click Run to restart the OScope function.
To Un-Calibrate All Offsets
To reverse the calibration procedure and delete software correction factors, you can un-calibrate all
offsets.
In the APP OScope window, from the menu bar, click Advanced, then Un-Calibrate All Offsets.
Note: After calibrating, click Run to restart the OScope function.
8.8.2 Setting all Analog Channel Inputs to Zero
You can set all analog channel inputs to zero in order to stop each analog channel input from reaching the
analog board signal acquisition circuitry. You can do this to calibrate internal offsets or to perform
troubleshooting.
To Set All Analog Channel Inputs to Zero
In the APP OScope window from the menu bar, click Advanced then Set All Analog Channel
Inputs to Zero.
8.8.3 Turning On All Alarms and LEDs
If you need to test the front panel LED’s and alarm outputs, you can turn them all on simultaneously. When
you do this, all of the relay coils will energize and the front panel LED’s should illuminate.
To Turn On All Alarms and LEDs
1. In the APP Driver OScope window from the menu bar, click Advanced, then Turn On All
Alarms and LEDs.
2. To reset all the alarms and LEDs, from the File menu, click Reinitialize.
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