14
6 Test
Functions
Test functions can be accessed by pressing the ESC Key when power is first turned
on and “NDT James Inst.” is displayed. Several functions are available for both
testing and initialization. To return the instrument back to it’s normal functions will
require that power be turned off and then back on. Below are the available
functions.
6.1 TEST
KEYS
Displaying this menu item and pressing the Enter Key will enable a technician
to verify the operation of the key switches. The instrument will display the
function of a pressed key. Power must be turn off to exit this test.
6.2 TEST
DISPLAY
This test is used to determine if all characters can be displayed. Starting with
the first line, all displayable characters will be displayed. When this line is
finished data will be sent to the second line. This process will continue until
all displayable characters have been sent to the display. Using the Up and
Down Keys other test functions may be accessed.
6.3 TEST SERIAL COMM
This test is used to verify the serial communications functions and accuracy.
A loop back plug connecting pins 2 and 3 together is connected to the upload
serial port. If this plug is not install and error message will be displayed. A
string of characters “COMM. Test 1234” are transmitted and then received.
The received characters must be the same as transmitted for a successful
test. Displayed will be “Loop back test, COMM
.
Test 1234”. If an error occurs
during the test a receiving error message will be displayed. Using the Up and
Down Keys other test functions may be accessed.
6.4 TEST DATA MEMORY
This test is used to verify the operation of the external EERPOM memory
used to store Test Records. Testing will take some time because for each
byte in the memory, the data is first saved, then 0xAA is written to that
memory location, then it is read back. The read data must equal 0xAA. Then
0x55 is written and read from the same location. The read data must equal
0x55. Finally, the memory location’s original data is restored. This process is
continued for each location in the memory. On the second line of the display
the current memory location is displayed. At the end of the test all data
written must be read correctly for the test to pass. The instrument will display
“Memory Test OK” and memory location 8190 at the completion of a
successful test. Using the Up and Down Keys other test functions may be
accessed.
