TB 9-6625-1947-24
(10) Adjust A3R20 (fig. 2) for a 0.80 V indication on multimeter (R).
(11) Adjust AMPLITUDE control for a 0 dBm indication on TI meter.
(12) Adjust A2C43 (fig. 1) for R2 value recorded in 9 a (9) above (R).
(13) Repeat 9 a (14) above.
10. Output Impedance
a. Performance Check
(1) Connect equipment as shown in figure 3.
TI
BAL
UNBAL
RESISTANCE STANDARD
RESISTANCE STANDARD
Figure 3. Output impedance - equipment setup.
(2) Position controls as listed in (a) through (d) below:
(a) FREQUENCY RANGE switch to X1K.
(b) FREQUENCY dial to 1.
(c) OUTPUT LEVEL dBm switch to +10.
(d) Press IMPEDANCE 75 UNBAL pushbutton.
.
(3) Set both resistance standards to 75
(4) Adjust AMPLITUDE control for a 0 dBm indication on TI meter. Multimeter
will indicate between .8573 V rms and .8747 V rms.
.
(5) Set both resistance standards to 67.5
(6) Press IMPEDANCE 135 BAL pushbutton.