TB 9-6625-2189-24
NOTE
Ensure that TI has had at least a 1 hour warm-up before
performing adjustments.
a. A/D Converter (R)
NOTE
The A/D converter procedure is an iterative process. Each pass
through the procedure uses the constants stored previously and
improves them. Also, if A/D converter is performed it must be
followed by performance of b below (Offset and Gain), and c
below (High Frequency).
(1) If necessary, set calibrator to STANDBY and press RESET pushbutton; then
disconnect TI from calibrator.
(2) Press TI CAL ENABLE switch using suitable instrument. (The CAL ENABLE
switch is located on the right side on the display. It is recessed and may be covered by a
calibration seal.)
(3) When .0 V DC is displayed, short INPUT HI and LO terminals.
(4) Press TRIG/STORE pushbutton.
NOTE
When TRIG/STORE pushbutton is pressed, the TI display
field blanks while necessary calculations are being performed.
Do not change input voltage while the display is blank.
(5) When -.03 V DC is displayed, remove short from TI and connect calibrator
OUTPUT to TI INPUT HI and LO terminals.
(6) Set calibrator for a -30 mV dc (-0.03 V) output. Allow approximately 10 seconds
for calibrator output stabilization, then press TI TRIG/STORE pushbutton.
(7) Repeat technique of (6) above for each successive prompted voltage displayed by
the TI, being careful to apply proper voltage and indicated polarity. The last prompt should
be +.0725 V DC. Afterwards, the TI will begin taking readings in the 2 V range.
(8) Verify the A/D converter by applying the inputs listed in table 7. If TI does not
indicate within the limits specified, repeat steps (1) through (7) above with the following
exception: in step (2), press EX TRIG/A/D pushbutton instead of the CAL ENABLE
pushbutton.
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