GE Phasor CV User Manual

5. Making Conventional Measurements
Page 76 PHASOR XS Operating Manual
prevent you from modifying the PROBE NAME or any of
the other settings described in Step 4.
Step 4: If the user-defined probe type (PROBE #0) is
selected, you must then select the DGS PROBE sub-
menu and input the characteristics for the probe you’ve
connected including:
XTAL FREQUENCY—The probe’s frequency rating
EFF. DIAMETER—The probe element’s effective
diameter rating
DELAY VELOCITY—User determined delay-line
velocity
Note that these characteristics can’t be changed for any
probes other than PROBE #0.
5.14.2 Record the Reference Echo that
Defines the DGS Curve
Prior to generating the DGS curve, a test standard with
a known reflector must be used to define a reference
point. Acceptable test standards include these reference
types:
• BW—Backwall echo with reference defect size de-
fined as infinity
• SDH—Side Drilled Hole with a reference defect size
defined as the hole’s diameter
• FBH—Flat Bottom Hole with a reference defect size
equal to the hole’s facial diameter
Follow these steps and
Figure 5-9 to record a reference
echo:
Step 1: Select the REF ECHO submenu, then the REFER-
ENCE TYPE function. Once activated, this function allows
you to select one of the three reference types described
above, and specify the size of the known standard’s refer-
ence flaw.
Step 2: Couple the probe to the known standard,
capture the reference flaw so that it’s reflected echo is
displayed on the instrument’s A-Scan, and adjust the
A-Gate’s starting point to ensure that the resulting echo
triggers the gate.
Step 3: Adjust the gain knob until the reference flaw’s
A-Scan peak measures 80% of FSH (A%A = 80%).
Step 4: With the probe coupled to the standard, and the
reference flaw’s echo captured by the A-Gate, press
next to the RECORD REF function to store a DGS refer-
ence echo.
NOTE: The AUTO 80 function allows for automatic ap-
plication of gain to set A-Gate’s triggering echo to 80%
of full screen height. This function can be accessed
at any time via the knob emulator menu (activated by
pressing
).
FIGURE 5-9—Recording a DGS reference point from which a DGS Curve will be generated.

GE Phasor CV Specifications

General

Brand	GE
Model	Phasor CV
Category	Measuring Instruments
Language	English