TB 9-6625-1947-24
(7) Adjust AMPLITUDE control for a 0 dBm indication on TI meter.
(8) Connect multimeter, in turn, to each resistance standard and record readings.
Sum of multimeter readings will be between 1.150 V rms and 1.174 V rms.
a
(9) Repeat technique of (5) through (8) above with resistance standard set to 75
nd press IMPEDANCE 150 BAL pushbutton. Sum of multimeter readings will be
between 1.213 and 1.237 V rms.
a
(10) Repeat technique of (5) through (8) above with resistance standard set to 300
nd press IMPEDANCE 600 BAL pushbutton. Sum of multimeter readings will be
between 2.424 V rms and 2.474 V rms.
b. Adjustments. No further adjustments can be made.
11. Distortion
a. Performance Check
(1) Connect audio analyzer or spectrum analyzer to TI UNBAL output connector,
using a 50 feed-through termination.
(2) Position controls as listed in (a) through (d) below:
FREQUENCY RANGE switch to X10.
(a)
FREQUENCY dial to 1.
(b)
OUTPUT LEVEL dBm switch to +10.
(c)
Press IMPEDANCE 50 UNBAL pushbutton.
(d)
(3) Adjust AMPLITUDE control for a +1 dBm indication on TI meter. If measured
distortion is not greater than 40 dB below the fundamental frequency, perform b below.
(4) Repeat technique of (2) and (3) above at FREQUENCY RANGE switch and
FREQUENCY dial settings listed in table 6. Measured distortion will be greater than 40
dB below fundamental frequency (>34 dB 1 MHz to 10 MHz).
Table 6. Distortion Check
Test instrument
FREQUENCY RANGE
FREQUENCY
switch settings
dial settings
X10
5
X10
10
X100
1
X100
10
X1K
10
X10K
1
X10K
2
X100K
1
1
X100K
5
X100K2
10
X1M
10
X1M
5
X1M
1
Replace audio analyzer with spectrum analyzer.
1
2Measured
distortion will be >34 dB below fundamental frequency at & above 1 MHz.
