Calibration Procedure-SG
505
Adjustments
ADJUSTMENTS
Introduction
This procedure need not be periormed unless the
instrument fails to meet the performance requirements of
the electrical characteristics listed in the Specification
section of this manual. To ensure instrument accuracy,
perform the adjustment of the instrument every 1000
hours of operation or every six months if used infrequent
ly. Adjustment may be required after a repair has been
made. If adjustment of internal controls does not bring the
i nstrument performance within the limits listed in the
Specification section, troubleshooting is i ndicated, Ad
justments should be made with the instrument operating
at an ambient tem perature of 20° C to 30° C.
Test Equipment Required
Test equipment used for adjustment of the SG 505 is
listed at the beginning of the Calibration section of this
manual.
Preparation
To gai n access to the adjustable components, remove
the left side cover of the SG 505 by pulling the rear of the
side cover outward from the instrument. Adjustment
locations are shown in the adjustment locations i l l ustra
tion located in the pullout pages in the rear of this manual.
Connect the SG 505 to the power module via the
extender cable. Connect the test equipment and the power
module to a suitable line voltage source. Turn on the
power module and test equipment; allow at least 30
minutes warm-up time for the SG 505.
PROCEDURE
1. Adjust Frequency
Hz
Dial
a. Set the SG 505 controls as follows:
FREQUENCY Hz Dial
4
FREQUENCY Hz
Pushbutton
x 1 k
FREQ VERNIER
centered
OUTPUT LEVEL (dBm)
0
OUTPUT LEVEL ( dBm
CAL
fully cw
ON-O F F
ON ( i n )
G N D E D-FLTG
FL TG (out)
I N TERMOD TEST S I G
Pushbutton ( O pt.)
OFF (out)
b. Connect the SG 505 SYNC OUT through a coaxial
cable to the counter I n put. Set the counter for 1 Hz
resol ution.
c. CHECK! ADJUST-the SG 505 frequency for
4.000 kHz as follows: Loosen internal set screw #1 iocated
on the reduction drive shaft of the FREQUENCY Hz
potentiometer assembly R530 and R520 (see Fig. 4-5).
Position the FREQUENCY Hz dial to 4. Loosen set screw
#2 and turn the potentiometer shaft with pliers until the
counter reading is 4.000 kHz. Tighten set screw #2 without
moving the FREQUENCY Hz dial. Turn the FREQUENCY
Hz dial to gain access to set screw #1 and tighten.
d. Remove all connections to the SG 505.
Fig.
4·5. left side view of
SG
505.
2.
Adjust Output Level Amplitude
a. Set the SG 505 controls as follows:
FREQUENCY Hz Dial
FREQUENCY Hz
Pushbutton
FREQ VERNI ER
OUTPUT LEVEL (dBm)
OUTPUT LEVEL (dBm)
CAL
ON-OFF
G NDED-FLTG
I NTERMOD TEST SIG
Pushbutton (Opt.)
x 1 k
centered
o
fully cw
ON ( i n )
F L T G (out)
OFF (out)
4- 1 3
Summary of Contents for SG 505
Page 10: ...SG 505 The SG 505 Oscillator viii...
Page 17: ...Installation Instructions SG 505 Ag 2 2 Front panel controls and connectors 2 3...
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