DMTA-10040-01EN, Rev. E, February 2018
Control Functions 115
MID probe drive (the default setting) is normally sufficient for most eddy current
testing. However, HIGH probe drive is desirable in the following cases:
a) If gain is insufficient at the lower probe-drive settings.
b) During testing of lower conductivity materials.
c) For finding smaller flaws in the test material.
d) For deeper penetration into the test material.
To adjust the probe drive level, press the MAIN FILTER menu key ( ) four
times, followed by the A key. With the PRB DRV function highlighted, rotate the
knob to the desired level.
PRB CONN (probe connection)
The NORTEC 600 instrument supports two types of probe connections: BNC and
16-pin LEMO. The probe input by default is set to 16-pin LEMO. If the BNC
connector is used the connection input needs to be changed manually.
To adjust the probe-connection input, press the MAIN FILTER menu key ( )
four times, followed by the B key. With PRB CONN highlighted, rotate the knob
to select the desired connector: LEMO‑16 or BNC.
SIG TYPE
SIG TYPE (signal type—absolute or differential) is displayed only when using an
adaptor compatible with one of the six heat exchanger tubing applications (see
“Heat Exchanger Tubing Applications” on page 228).
Slide Rule
The NORTEC 600 instrument includes a useful slide-rule tool for determining the
standard depth of penetration for a given material at a specified frequency. The
user can select a material from the list or enter a specific conductivity value.
The slide-rule tool can also determine the necessary frequency for a given depth
of penetration. The separation angle is assumed to be 118 degrees for this
calculation.
To access the slide-rule menu, press the MAIN FILTER menu key ( ) four
times, followed by the E key. When the EDDY CURRENT SLIDE RULE menu is
displayed, use the FULL NEXT key ( ) to navigate the menu functions.
Additional navigation instructions and information are displayed in the help text
at the bottom of the screen (see Figure 4-12 on page 87).
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