9
9
- HW - Negative half-wave rectified
- HW
when selected, displays only the negative portion of the RF signal on the A-trace display.
FW - Fullwave rectified
FW
when selected, displays a superimposed -HW signal on a +HW signal on the A-
trace display.
RF - Non rectified radio-frequency
RF
when selected, displays both the +HW and -HW signals, non-rectified, at 50%
screen height.
Thickness measurements are permitted in RF RECTIFICATION as well as +HW, -HW or FW. Polarity
bar indicator will also indicate appropriate half of the display when in RF mode.
FILL
ON - Fill the waveform when in +HW, -HW or FW mode
OFF - Display waveform in outline mode.
FILTER
A broadband frequency filter centered around 7MHz at 100% BW. Best used when probe is
10MHz or less
GATES MENU
IP BLOCKING GATE
(IP-Blk)
Used to Increase or Decrease the length of the gate that is used to block out any unwanted
signals after the Main Bang (Initial Pulse ) . Adjustment of the IP
BLOCKING GATE
will allow
proper setup for IP to first back echo measurement in the thickness mode.
THRESHOLD
(THRESH)
Allows Increase or Decrease the Measurement Threshold level. Any echo or echo half cycle
with amplitude equal to or greater than the Thickness Gate Threshold will be measured. The
threshold gate is the bar on the left of the A-Trace frame extending to the first echo in the figure.
(Directly Adjustable via up or down arrow)
ECHO BLOCKING GATE
(ECHO-BLK)
Allows Increase or Decrease the length of the echo blocking gate that is used to block out any
unwanted signals between multiple echos in the thickness mode.
ZERO ADJUST
(ZERO)
A fine delay function which allows for compensation of transducer wearsurfaces, coupling
membranes and angle beam wedge. Adjustment is continuous from 0 to 20,000 nanoseconds.
(Directly Adjustable via up or down arrow)
ECHO MULTIPLE
(MULT)
Allows the selection of a multiple echo from which the thickness measurement will begin. For
instance, 1
st
to 2
nd
, 2
nd
to 3
rd
and so on. Up to the fifth multiple echo can be selected.
IF BLOCKING GATE
(IF-Blk)
Used to Increase or Decrease the length of the gate that is used to block out any unwanted
signals between the first back echo (IF) and the second back echo. Proper adjustment of the IF
BLOCKING GATE will allow measurement of the first back echo to the second back echo in the
thickness mode.
