NDT
INTERNATIONAL, INC.
NDT-710
Thickness
Gauge
8
Calibration to a Known Thickness
To measure materials other than carbon steel follow this procedure. A calibration standard of
the same material and of known thickness is required. For best results, the thickness should be
equal to or slightly greater than the thickness of the part to be measured. The standard Zero
Calibration step, explained previously, must be done prior to this calibration.
1) Apply a thin layer of couplant to the calibration standard. Place the transducer on the
standard and make sure the reading is stable. The reading obtained will not
necessarily match the known thickness of the calibration standard.
2) Uncouple the transducer from the same and use the UP
(
▲
)
or DOWN
(
▼
)
keys to
adjust the LCD display until it shows the same thickness as the sample block.
3) You are now ready to measure. This adjustment is saved in memory and will not
change until the Zero Calibration step is repeated.
Using A Special Application Transducer - Sensitivity Adjustment
When using other than the standard transducer provided with the NDT-710 gauge it may
be necessary to make an adjustment to the sensitivity pot. This adjustment may be
necessary when using these special application transducers:
Part No.
710-2HT
High Temperature Transducer
710-3
Low Range Transducer
710-4
High Power Transducer
710-7
Small Diameter, Higher Resolution Transducer
710-8
Pencil Type Transducer
It should not be necessary when using these transducers:
Part No.
710-1
Standard Transducer
710-1HT
High Temperature Transducer
710-5
Small Contact Diameter Transducer
710-6
Low Profile Transducer
Sensitivity adjustment is performed as follows:
1) Connect the transducer to the gauge and turn gauge ON.
2) Remove the small black cap located to the right of the transducer connectors at
the top of the gauge.
3) Locate the small slotted pot just inside the case.
4) Using a small screwdriver, turn the pot full Counter Clockwise (CCW).
NOTE: Full movement of this pot is about ¾ of a turn.
5) With the transducer on the gauge keypad 0.250" calibration block, push (CAL).
