Use the Test Point Configuration (TPC) configuration screen to mathematically adjust DSAM level readings. This better represents the level value at a common point of reference, such as adding 10dB automatically to level readings taken at a 10 dB down tap to better represent the level value on the main distribution hard line. TPC affects the measurement levels of most measurement modes on the DSAM. A graphical representation of the way the user-entered TPC values affect the level readings is available by pressing Summary softkey while in the configuration mode. TPC values are saved inside of each saved measurement file and permanently associated with the file.

Test Point Compensation will display an icon in each of the modes it applies to. If a mode is created that has a total effect of 0 dB on the current mode, the icon will not be displayed (Default Settings has an effect of 0 dB). The total effect of the current Test Point Compensation file (if non-zero) is displayed to the right of the icon. The Test Point Compensation configuration screen can be reached within each of these modes by pressing the keypad shortcut of shift-4. When the user is finished with the Test Point Compensation configuration, press Done to return to the original measurement mode.

Test Point Compensation applies to the following modes:
- Level
- Miniscan
- Fullscan
- Tilt
- Constellation
- DOCSIS Range (downstream results only)
- Upstream Spectrum
- Downstream Spectrum
- Ingress Resistance
- Forward Sweep
- Reverse Sweep
- Combo Autotest
- Video Autotest
- CM Autotest
- TechComplete / Closeout

NOTE:
Forward TPC values are applied to all modes except Reverse Sweep. Reverse TPC values are applied to only the Reverse Sweep mode.

The main Test Point Configuration (TPC) screen contains a listing of TPC files. TPC files can be created from this screen or deployed to the meter via the JDSU Test Productivity Pack software. Each file displays the reverse and forward compensation to the right of its name. Files can be created, edited, and deleted. Select files by using the up and down keys.

The "edit TPC Plan" screen provides the following settings.

REVERSE:
Internal Loss (dB)
Example:
Attenuation pad within an amplifier under test
The range is -50.0 to 50.0 dB and the default value is "0.0 dB".

External Loss (dB)
Example:
A distribution tap value on a drop
The range is -50.0 to 50.0 dB and the default value is "0.0 dB".
Probe Loss (dB)
Example:
Attenuator added inline with test lead
The range is -50.0 to 50.0 dB and the default value is "0.0 dB".
NOTE:
The sum of the Internal, External, and Probe loss values is restricted to a minimum of -100 dB and a maximum of +100 dB.

Reverse Telemetry Level

The range is 10 to 55 dBmV and the default value is "20 dBmV".

Reverse Sweep Insertion Level

The range is 10 to 55 dBmV and the default value is "20 dBmV".

FORWARD:
External Loss (dB)
Example:
A distribution tap value on a drop
The range is -50.0 to 50.0 dB and the default value is "0.0 dB".

Probe Loss (dB)
Example:
Attenuator added inline with test lead
The range is -50.0 to 50.0 dB and the default value is "0.0 dB".

Use the arrow keys to highlight the item you want to edit on the configuration screen. Press ENTER to open the edit box and use the alphanumeric keypad to type your entry or the arrow keys to select the choice you prefer. Then press ENTER to complete the edit.

Test Point Compensation menu options include:
FILE:

Allows you to create a NEW file, RENAME an existing file, or DELETE an existing file. NOTE: If the "OFF" TPC file is selected, the RENAME and DELETE menu items are unavailable.

EDIT:

Allows you to edit the forward and reverse parameters. NOTE: This button is unavailable if the "OFF" TPC file is selected.

SUMMARY:

Displays a graphical representation of the user-entered TPC values for the selected TPC file.

DONE:

Activates the currently selected file and closes the mode