TB 9-6625-116-24
Table 9. Special Cal DAC Characterization
Characterization Softkey
Approximate Time to Complete
Chse DAC
5 minutes
Chse VCO
1 minute
Chse SQU/TRI TMK
3 minutes
Chse LF SIN DC O/S
3 seconds
Chse PULSE WIDTH
3 minutes
(4) Connect time/frequency workstation 10 MHz output to frequency counter
REFERENCE IN.
(5) Connect TI CH 1 output to frequency counter INPUT A through active head.
(6) Set frequency counter as listed in (a) through (d) below:
(a) FUNCTION, FREQ A
(b) INPUT COUPLING A, DC
(c) INPUT IMPEDANCE, 50
(d) EXT REF, enabled
(7) Set TI as listed in (a) and (f) below:
(a) [ADJUST FREQ]
(b) [CHANNEL SELECT]
(c) [SIGNAL CH 1]
]
(d) [LOAD 50
(e) [EXIT]
(f) OUTPUT, ON
(8) Using cursor keypad or spinwheel, adjust TI DAC Factor until frequency
counter indicates as close to 100.0000000 MHz as possible.
(9) Press [EXIT] twice to save new frequency correction and return to Calibration
Mode screen.
c. Base Cal
NOTE
Over time a cal point can be adjusted to its extreme causing the
TI to display "Outside calibration range." [RESET CAL
POINT] may resolve the problem. If this does not resolve the
problem, the TI may require repair.
NOTE
The default high voltage interlock threshold setting is 100 V.
When output exceeds 100 V, OUTPUT ON must be pressed
again to activate output. High voltage signal will sound.
12