TB 9-6625-160-24
(7) Insert 600 Ω feedthrough termination between OUTPUT HIGH and INPUT
HIGH. TI right display should read between 49.90% and 50.40%.
(8) Replace 600 Ω feedthrough termination with 50 Ω feedthrough termination. Key
in 47.1 SPCL to set source impedance to 50 Ω. TI right display should read between
49.00% and 51.00%.
(9) Replace 50 Ω feedthrough termination with RESISTANCE STANDARD set to 100
kΩ in series with INPUT HIGH. TI right display should read between 49.00% and 51.00%.
(10) Set INPUT switch to FLOAT. Move connection from INPUT HIGH to
INPUT LOW. TI right display should read between 49.00% and 51.00%.
b. Adjustments. Perform adjustments in paragraph 17 below.
16. Common-Mode Rejection Ratio
a. Performance Check
(1) Press TI numerical key for 41.0 and then SPCL key to initialize TI.
(2) Set TI INPUT FLOAT switch to FLOAT and OUTPUT FLOAT switch to ground.
(3) Press TI numerical key for 47.0 and then SPCL key to set TI impedance to
600 Ω. Set AMPTD to 1 V and FREQ to 20 Hz.
(4) Connect TI OUTPUT HIGH to both INPUT HIGH and LOW.
(5) Key in special function as indicated in first row of table 24 below. For each
setting TI right display should indicate within corresponding limits specified.
(6) Repeat step (5) above for remaining setting and limits listed in table 24 below.
Table 24. Common-Mode Rejection Ratio.
TI
TI Right Display AC Level Limits (mV)
Special Function
Output Frequency (Hz)
Indicated
Max
1.12
20
1
1k
1
20 k
32
1.1
20 k
32
1k
5.6
20
5.6
b. Adjustments
NOTE
Perform paragraph 17 a (Internal Reference Frequency
Adjustment) prior to any other adjustments as this has an
effect on all remaining adjustments. If already performed,
proceed as outlined below.
(1) Connect TI OUTPUT HIGH to both INPUT HIGH and INPUT LOW.
(2) Press TI numerical key for 41.0 and then SPCL key to initialize TI.
(3) Set TI INPUT FLOAT switch to FLOAT and OUTPUT FLOAT switch to
ground.
