Operator`s manual

Viewing Waveforms, Vectors, and Pictures

7-27

Figure 7-27. Picture Guard Locations

Picture Reference While External Reference is On

The picture is normally referenced to itself when displayed, even if the MM-410/AVM-510A is set to

REFERENCE (EXT). This prevents the picture from shifting up and down, left and right, if the timing

of the external sync is different from the displayed signal.

When the MM-410/AVM-510A is internally referenced (Ext Ref LED off), the locking source for the

waveform, vector, or picture is the signal itself.

When the MM-410/AVM-510A is externally referenced (Ext Ref LED on), the waveforms and

vectors are locked on to the signal coming in from the Ext Ref connector at the rear panel.

If you want to look at the picture and have it referenced to itself (so all the colors are correct) or if you

want to see the picture locked to the external reference (where changes in the hue and in the horizontal

and vertical position tells you something about the relative timing), you can view the picture either

way. The picture reference can follow the Ext Ref LED, or it can remain locked to internal.

To change the picture to external sync:

1. Press the Config button.

2. Select PICT. REF and then press the Enter button.

Press the Enter button to change between INT (the picture will always be reference to itself) and

REF [the picture reference is determined by the state of REFERENCE (EXT)]. Select REF.

Press Clr Mnu to exit.

The reference for the picture now follows the main reference, whether its internal or external. The

menu line just below this reference is the same one you change when you press the Blue (2nd) button

and then the 2 Field button.

NOTE:

When a vector is displayed with a picture, the vector reference is the same as the

picture reference, regardless of the setting of REFERENCE (EXT). The Ext Ref LED

lights when EXT REF is selected.