DeFelsko PosiTest HHD, Инструкция по эксплуатации

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7
8. Release the safety trigger to turn high voltage OFF and return
the
PosiTest HHD
to
Standby Mode
.
The
PosiTest HHD
is now ready to use.
Adjusting the Test Voltage
1.With the detector powered
ON
and in
Standby Mode
, press
to open the menu and then select the
Voltage Set
icon .
2.The detector will display the test voltage
3.Use the or buttons to adjust the voltage. The voltage
adjusts in 10V increments between 500V and 1,000V, and in
100V increments between 1kV and 35kV.
4.Select
OK
with the button to save the voltage and exit.
-
+
The formula and suggestions for setting voltage are
supplied as a guide. Always consult the coating manufacturer for
recommended voltage settings.
NOTE:
The inspection voltage should be obtained from the coating
manufacturer’s specification or by contacting the coating
manufacturer. Based on international standards, formulas and
tables can be used as a guide for setting voltages on various
coating thicknesses. A sample calculation from NACE International
Standard Practice SP0274-2011 is as follows:
The voltage output of the
PosiTest HHD
is regulated and maintains
the test voltage under normal electrode loading. When in
Detection
Mode
, the test voltage being generated is displayed on the
PosiTest HHD
. Minor fluctuations on the display are normal during
inspection as the
PosiTest HHD
is regulating the test voltage.
When the electrode is connected to ground, the display will show
“---" indicating that the generated voltage is less than the minimum
of 500V.
V = 1,250 √T (mils)
V = 7,900 √T (mm) where V = Voltage in volts
T = Thickness of coating