90 DF-310E User Interface
VDC recorder, the output will be 8.000 VDC. See the sticker inside the front door that indicates
to what full-scale voltage the Analog Output has been configured.
8.6.3.4 Test Relays
The Test Relays selection in the Diagnostics Menu, Figure 56, is used to assure that the relay
outputs are functioning. When the Test Relays option is selected, the display will show Figure
62.
Figure 62: Test Relay Screen
Select the relay to be tested, then press . The relay will toggle between on and off each time
is pressed. An audible click will occur. The condition of the relays before the test will be
restored when the test is concluded.
8.6.3.5 Memory Test
The Memory Test selection is used to test the internal memory of the Analyzer. When the
Memory test option is selected from the Diagnostics Menu, Figure 56, the display will show
Figure 63. Testing automatically begins.
Figure 63: Memory Test Screen
During the ROM test the program EPROM contents is used to calculate a checksum, which is
compared to a checksum that was stored in the EPROM at the factory. Any changes in the
program code can be detected. Next, the microprocessor internal memory (IRAM) is tested,
followed by the system “external” random access memory (XRAM). As each portion of the
memory is successfully tested an OK will appear at the end of the line. If any memory test fails,
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