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Model 606A
Sect. I] Page 5
EXTERNAL
OUTPUT
TERMINATION
FREQUENCY
PERCENT MODULATION
CALIBRATE
MODULATION
AMPLITUDE
VERNIER
MODULATION
SELECTOR
ATTENUATOR
EXT,
INT.
———
SIGNAL GENERATOR
MODULATION
CRYSTAL
CALIBRATOR
INPUT QUTPUT
PHONES.
OFF
i
'one @
WODEL
HEWLETT
acd ALTO
caLiFor
TO
UNIT
UNDER
TEST
OUTPUT
TERMINATION
606A — 344A
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
( @ Stock No. 606A-
34A) is recommended.
This output termination
is designed for use at the end ofa 50 ohm shielded
cable,
and
to operate
into a high impedance
(500 ohms or greater) load.
The probe has three positions as the rear shell
of
the
probe
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).
Zero
db attenuation
- 25 ohms
output im-
pedance (1:1 voltage ratio).
Twenty db attenuation - 5 ohms output im-
pedance (10:1 voltage division).
NOTE
-
Maximum permissible input power to
probe is 18 milliwatts (3 volts across 50 ohms),
*
See
''Standards
on
Radio
Receivers'',
In-
stitute
of
Radio
Engineers,
1938;
ani
Terman,
''Radio Engineers
Handbook'', any
edition
- section entitled ''Measurements
o
Radio Receivers''.
Figure 2-3
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