Calibration Procedures - GE MFE DMS 2 Operating Manual

3. Setting Up the DMS 2
Performing the USER Zeroing Procedure
Step 1: The USER procedure must first be selected in the
TGMODE submenu (Section 3.3.1). It's available for specific
dual element probe types.
Step 2: With the probe connected and properly identified,
remove all couplant from the face of the probe, hold the probe
in air. Press the PRB ZERO key on the DMS 2.
Step 3: The instrument will zero the probe.
Performing the MANUAL Zeroing Procedure
Step 1: The MANUAL procedure must first be selected in
the TGMODE submenu (Section 3.3.1). It's available for all
probes, when using the DUAL and SIP measurement modes.
It won't be available if a 2-PT calibration or a D-MULTI,
S-PEAK, or S-FLANK measurement mode is specified.
Step 2: With a probe connected and properly identified
(Section 3.3.1), press
Step 3: Couple the probe to the instrument's built-in zero
block as instructed on the display screen.
Step 4: When the ZERO COMPLETE message appears, the
probe is zeroed.
Step 5: The probe zeroing procedure has been completed.
You may resume testing or perform another procedure.
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NOTE: Some probes require the face to be in air to zero. If
the probe is coupled and the DMS 2 is turned on, the unit will
attempt to zero the probe (indicated by the PO icon being
displayed). Until the probe is uncoupled, the PO icon will
remain visible prompting the user to uncouple the probe to
perform a probe zero.
NOTE: The A-scan display is inactive during probe zeroing.
3.3.4

Calibration Procedures

The probe zeroing procedure must be performed each time
the probe is changed. The probe should be zeroed prior to
performing a one-point calibration procedure to ensure that a
proper calibration results. Of course the instrument will zero
the probe automatically if AUTO zeroing is selected. The
operator must first specify the type of calibration procedure
to be performed (Section 3.3.1). The procedures available will
vary based on the probe and measurement mode selected.
The following are the two basic calibration procedures
available:
1. 1-PT (1-point)—Available for all measurement modes
• Calibrates the DMS 2 to a known thickness.
• 1-PT calibration is the most commonly used method.
DMS 2 Operating Manual