Tektronix VX4802, User Manual

Page: 93 / 102

Appendix E: Performance Verification
VX4802
A–29
Equipment
Requirements Loop-back assembly (item 2)
Prerequisites All prerequisites listed on page A–22
1. Attach the loop-back assembly as shown in Figure 4, which connects the odd
bytes to the even bytes respectively (0 to 1, 2 to 3, 4 to 5).
2. Perform a self test and query for any error codes (in ASCII format) with the
VX4802 device-under-test and the VX4801:
&#% $"
#
(Observe: NO ERRORS)
$%
&#% $"
#
(Observe: NO ERRORS)
NOTE
. If at any time in this procedure you do not observe the result expected,
check the front panel error light and/or perform an error Status Query
&#%
"# # #
No additional commands will be accepted until an
error condition is cleared.
3. Verify the odd byte data inputs and the even byte data outputs with the
following steps:
a. Reset the VX4802 to its power-up state, set the mode for the odd bytes
(1, 3, 5, 7, 9) to be active low inputs, for the even bytes (0, 2, 4, 6, 8) to
be active high outputs initialized with a Load Output value of 55, and set
the tri-state function to be inactive (* => all bytes, i => inactive):
$%
&#% # ! %
b. Perform an input and verify a response of 55AA on even/odd channels:
&#%
#
(Observe: 55AA55AA55AA55AA55AA)
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