Epson USN 52L, USN 52R manual Suppression Reject

Function check		Operation
Check	Result	Remark
7. Suppression (Reject)
For settings see 2.
Set the 2nd echo just under 80% SH
REJECT: SET 80%	Echos 2 to 5 are consecutively suppressed.	2nd echo is visible when the gain
	Only the initial pulse and the 1st echo at Div. 2	is increased by 0.5-1 dB.
	are visible.
Set REJECT to 0% after check
8. Vertical linearity
For settings see 2.	Height of echo is displayed in the
GATE LOGIC: POSITIVE	measurement line in % screen HT (H=80%)..
a-THRESH: 10%
a-WIDTH: 50 mm
AMPLITUDE: % screen HT GAIN and
a-START so that selected echo is in the
gate
Increase GAIN by 2dB, then decrease	Amplitude values:	Deviations must not be more then
by 2 dB	+ 2 dB = 100%	2% screen HT.
	-2 dB = 63%
	-4 dB = 50%	Determine the height at the last
	-6 dB = 40%
	-8 dB = 32%	measured value, if required, by
	-10 dB = 25%	comparison with the graticule
	-12 dB = 20%	because values below the gate
	-14 dB = 16%	are not displayed
	-16 dB = 13%
	-18 dB = 10%

Krautkramer USN 52R/USN 52L Issue 05, 02/00 5-67