Sectionv - HPE 606A Operating And Servicing Manual

Model 606A
1-1 GENERAL DESCRIPTION
The Hewlett-Packard Model 606A is a general-
purpose signal generator with a frequency range of
50 kc to 65 mc in six ranges. The instrument has
a direct reading frequency dial calibrated to an
accuracy of 1%.
Output is held constant within +1 db andis continu-
ously adjustable from 0.1 pv to 3 volts into a 50
ohm resistive load. In addition, a termination with
a 10:1 voltage divider which lowers the minimum
output to 0.01u.v (from a5 ohm source) or a dummy
antenna which simulates the standard IREstandard
dummy antenna for precision measurements on
receivers is available. An internal crystal cali-
brator provides check points at 100 kc and 1 mc
intervals with an error of less than 0.01%. A front
panel meter accurately indicates the percent ampli-
tude modulation for frequencies within the modu-
lation bandwidth of the signal generator.
The instrument has a highly refined modulation
system which allows modulation up to 90% with low
distortion and incidental fm. This feature makes
possible precision distortion checks of receivers
from antennas to output. The instrument has built-
in 400 and 1000 cps modulation and can accept ex-
ternal modulation from 20 cps to 20 kc or more,
depending on rf frequency in use.
1-2 OUTPUT TERMINATION
This signal generator is designed to be used with
an ® 606A-34A Output Termination. THE OUTPUT
LEVEL IS CALIBRATED ONLY WHEN USED WITH
THIS TERMINATION OR A 50 OHM RESISTIVE
LOAD. Further details concerning the use of this
output termination will be found in Section Il,
Sect.I Page 1
SECTION |
GENERAL INFORMATION
1-3. INITIAL INSPECTION
Your instrument was individually tested and in-
spected before leaving the factory and met all
specifications as printed at the front of this manual.
Upon receipt, you should inspect and operate the in-
strument to verify proper operation, Ifany damage
is found, refer to the ''Claim for Damage in Ship-
ment'' page of this manual.
The only preliminary check necessary before turn-
on is to check the meter movement mechanical
zero. The meter pointer should rest directly over
zero when the instrument is turned off. Bestac-
curacy is obtained if you observe this with one eye
only. To avoid parallax, position your head so the
meter scale, pointer and your eye are all in line,
A mechanically stable adjustment can only be made
when the direction of pointer travel is opposite to
the direction of rotation of the adjust screw, The
adjusting screws may be turned in either direction,
but a good method is to turn the screw clockwise
until the pointer swings up scale and then starts
to swing down scale towards zero (i.e.: counter-
clockwise), Continue turning the screw clockvise
until the pointer (now moving to the left)is directly
over the zero mark. If you overshoot, continue
turning the screw clockwise until the pointer is
again traveling down scale towards zero,
1-4 INSTALLATION INSTRUCTIONS
This instrument should not be operated inan ambient
temperature greater than +50°C. Donot install the
rack-mount model ina rack near other equipment
discharging hot air around the Model 606A.
For personnel protection the power cord shouli be
plugged intoa 3-prong (NEMA approved) receptec Je.
If a 2-prong adapter is used, ground the instrunent
by connecting the external wire to ground. T7he
receptacle box may be used if it is grounied.