Theory of Operation
System Tests (System PV)
GPIB Test
The GPIB test performs a write/read operation to each of the registers of the GPIB IC. A test pattern is written to each register in the GPIB IC. The pattern is then read and compared with a known value. The GPIB test will return a valid "Pass" or "Fail" status even if option 020 is not installed.
Passing the GPIB test implies that the read/write registers in the GPIB IC can store a logical "1" or a logical "0," and that the GPIB IC is functioning properly. Incoming and outgoing GPIB information will not be corrupted by the GPIB IC.
RS-232C Test
This test checks the basic interface functions of the
HIL Test
The HIL test exercises both the HIL circuitry internal to the logic analyzer and the HIL interface between the logic analyzer and external keyboard, if an external keyboard is connected. First, a read/write operation is performed to each of the registers of the HIL IC. A test pattern is written to each memory location, read, and compared with a known value. Second, if an external keyboard is connected to the HIL port, the keyboard controller that resides in the keyboard is polled by the microprocessor. A test pattern is sent to the keyboard controller and returned to the microprocessor by the keyboard controller. The test pattern is then compared with a known value.
Passing the HIL test implies that the read/write registers in the HIL IC can store a logical "1" or a logical "0," and that the HIL IC is functioning properly. Also, passing the HIL test implies that the HIL pathway to the external keyboard is functioning and that the keyboard controller can communicate with the microprocessor in the logic analyzer. Incoming HIL information from the external keyboard will not be corrupted by the pathway between the keyboard controller and microprocessor.
Disk Test
The disk test exercises the disk controller circuitry by performing a read/write on a disk. Either an LIF formatted disk with 20 sectors available space or a DOS formatted disk with 5K available space is required and should be inserted in the disk drive. When the disk test is executed, the disk is checked sector by sector to find any bad sectors. If no bad sectors are found, a test file is created on the disk and test data is written to the file. Then, the file is read and the test data is compared with known values. At the conclusion of the test, the test file is erased.
Passing the disk test implies that the disk controller circuitry in the logic analyzer and the disk read/write circuitry in the disk drive are functioning properly. The disk drive can read and write to a LIF or DOS formatted disk, and the data will not be corrupted by the disk drive circuitry.
