TB 9-6625-1947-35
10. Output Impedance
a. Performance Check
(1) Connect equipment as shown in figure 3.
TI
BAL
UNBAL
RESISTANCE STANDARD
RESISTANCE STANDARD
MULTIMETER
(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 Ω.
(4) Adjust AMPLITUDE control for a 0 dBm indication on TI meter. Multimeter
will indicate between .8573 and .8747 V rms.
(5) Set both resistance standards to 67.5 Ω.
(6) Press IMPEDANCE 135 BAL pushbutton.
(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 and 1.174 V rms.
(9) Repeat technique of (5) through (8) above with resistance standard set to 75 Ω
and press IMPEDANCE 150 BAL pushbutton. Sum of multimeter readings will be
between 1.213 and 1.237 V rms.
