TB 9-6625-2251-35
o. Perform (1) through (6) below to establish trigger circuit DAC voltage reference
level.
(1) Set: TRIGGER. Crt will display message CONNECT TRIGS TO GND.
(2) Set calibrator (John Fluke, Model 5720A) for 0 V output and connect to TI EXT
TRIG 1 and EXT TRIG 2 through dual input coupler.
(3) Set calibrator (John Fluke, Model 5720A) for .000200 V output. Set: TRIGGER.
Crt will display message RUNNING. After approximately 3 to 5 seconds crt will display
message CONNECT...TO 0.5 V.
(4) Set calibrator (John Fluke, Model 5720A) for .500 V and set: TRIGGER. Crt
will display message RUNNING. After approximately 3 to 5 seconds crt will display
message CONNECT...TO 2.0 V.
(5) Set calibrator (John Fluke, Model 5720A) for 2.00 V and set: TRIGGER. Crt
will display message RUNNING.
NOTE
After successful completion of above sequence, crt will display
PASS message above option TRIGGER.
If a FAIL is
displayed, verify test setup and repeat o(1) through (5) above.
If FAIL message is still displayed, corrective action is
necessary.
(6) Crt will display message PASS and above option TRIGGER. Disconnect test
setup.
p. Perform (1) through (4) below for Ramp (REPET).
NOTE
REPET calibration adjusts timing of jitter correction amplifiers
so that waveform samples are correctly placed with respect to
trigger point in repetitive acquisition mode.
(1) Press MENU OFF/EXTENDED FUNCTIONS pushbutton two times.
(2) Set: CAL/DIAG.
(3) Set: EXT CAL to display EXT CAL menu.
(4) Set: REPET. Crt will display RUNNING and then display PASS or FAIL. If
needed.
NOTE
With jumper J156 (fig. 1) removed, calibration constants stored
in TI firmware will be lost when power is applied and must be
reestablished by performing this procedure completely.
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