Epson USN 52L, USN 52R manual Rectification

Function check		Operation
Check	Result	Remark
N30 in receiver socket and repeat.
12. Rectification
For settings see 2..	3 to 4 echo half-waves (echoes) are visible.
GATE LOGIC: POSITIVE
a-START: 47 mm
a-WIDTH: 7 mm
Set 1st echo to 80% screen HT.
Press H .
RECTIF.: POS HALF
RECTIF.:NEG HALF	3 to 4 echo half-waves (echoes) are visible,
	horizontally offset as opposed to:
	RECTIF.: POS HALF.
RECTIF.: FULL	6 to 7 echo half-waves which overlap each
	other. Partly the sweep no longer drops to 0%
	screen HT.
RECTIF.: RF	The echo having 3 to 4 oscillations is
	displayed in its original waveshape.

Krautkramer USN 52R/USN 52L Issue 05, 02/00 5-69