TB 9-6625-2303-35
e. Set factor switch to l00 and allow TI to warm-up for 5 minutes.
f. Set factor switch to BAT position; if meter pointer is not well within the battery test
region, replace TI battery. Allow an additional 5 minute warm-up after replacing the
battery.
8. Wattmeter Linearity Test
a. Performance Check
(1) Connect male end of a BNC T connector to calibration element.
NOTE
Use 50 Ω cable no longer than 3 feet for step (2) and (3) below.
(2) Connect one BNC T connector female end to audio analyzer output.
(3) Connect other end of BNC T connector to multimeter (ac mode).
(4) Adjust audio analyzer frequency controls for 1000 Hz.
(5) Set TI factor switch to 100.
(6) Adjust audio analyzer amplitude output controls so that meter pointer will rest
at 1 on the uppermost scale. Multimeter will indicate 1.575 and 1.607 Vac. If not, perform
b below.
(7) Repeat (6) above for the remaining TI factor switch settings listed in table 3.
Multimeter will indicate within limits indicated.
(8) Remove calibration element from T1.
Test instrument
Multimeter indications
factor switch
(Vac)
settings
Min
Max
Ideal
30
0.8861
0.9040
0.8950
10
0.4980
0.5080
0.5030
3
0.2802
0.2858
0.2830
1
0.1575
0.1607
0.1591
.3
0.0882
0.0908
0.0895
.1
0.0495
0.0511
0.0503
b. Adjustments
(1) Remove four screws from side of TI and pull back cover straight off.
NOTE
Ensure male end of BNC T connector is connected to
calibration element.
(2) Connect one BNC T connector female end to audio analyzer output.
