TB 9-6625-2246-40
b. Adjustments. If an out-of-tolerance condition exists, perform paragraph 18 below
and repeat 11 above.
12. Frequency Counter
a. Performance Check
(1) Press keys as listed in (a) through (f) below:
(a) FUNCTION/RANGE blue shift key then Reset/ key.
(b) FUNCTION/RANGE FREQ.
(c) FUNCTION/RANGE blue shift then MENU E/NPLC.
(d) FUNCTION/RANGE Menu Scroll until FSOURCE is displayed.
(e) NUMERIC/USER, then FUNCTION/RANGE Menu Scroll
until
ACDCV is displayed.
(f) NUMERIC/USER Enter.
(2) Connect function/arbitrary generator Output to TI Input HI and LO using
50
feedthrough termination.
(3) Set function/arbitrary generator for a sine wave, 20 Hz, 1 V rms output. TI will
indicate between 19.99000 and 20.01000 Hz.
(4) Set function/arbitrary generator frequency to 10 MHz. TI will indicate between
09.99900 and 10.00100 MHz.
b. Adjustments. If an out-of-tolerance condition exists, and if not previously
completed, perform paragraph 18 below and repeat paragraphs 11 and 12 above.
ADJUSTMENT PROCESS
13. Preliminary Instructions
a. Remove all external input signals from front and rear terminals.
b. Press FUNCTION/RANGE DCV key and Range
key to 100 mV range.
c. Release Terminals Front/Rear pushbutton to Front and Guard Open/To LO
pushbutton to Open.
d. Ensure that at least a 4 hour warm-up has elapsed since power was applied.
14. Front Terminal Offset
Sense and Input HI and LO as
a. Connect a 4 terminal short across front panel
shown in figure 1.
b. After connecting short, allow 5 minutes for thermal stabilization.