HP 606A Operating And Service Manual page 15

Model 606A
Section II
Figure 2-3
•11.
6.01. •
TO UNIT
UNDER TEST
FREQUENCY
"Ocnnavion t.'
,
urn
RIOIretinr
.
SI L. ( VC*
OUTPUT
TERMINATION
e
606A- 34A
The attenuator on the Model 606A Signal Gener-
ator is calibrated only when used with a load of
50 ohms. For high impedance loads or receiver
inputs the output termination
(
e
606A- 34A) is
recommended. This output termination is designed
for use at the end of a 50 ohm shielded cable, and
to operate into a high impedance ( 500 ohms or
greater) load.
The 606A- 34A has three positions as the rear shell
is rotated clockwise as follows:
a. DUMMY ANTENNA. Output impedance varies
as per IRE Standard Dummy Antenna* at an output
level 20 db below the input level ( 10:1 voltage
division ratio).
b. ZERO DB ATTENUATION. 25 ohms output
impedance ( 1:1 voltage ratio).
c. TWENTY DB ATTENUATION. 5 ohms output
impedance ( 10:1 voltage division).
Note: Maximum permissible input power to probe
is 180 milliwatts ( 3 volts across 50 ohms).
* See " Standards.on Radio Receivers", Institute
of Radio Engineers, 1938; and Terman, " Radio
Engineers Handbook", any edition -- section
entitled " Measurements on Radio Receivers".
Figure 2-3. External Output Termination
00170-2
2-3