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DESCRIPTION
1 .1
INTRODUCTION
Frequency Sweep
The SW 503 is a TM 500-Series plug-in that provides a
swept frequency of 1 MHz to 400 MHz with variable sweep
rate, width, and output level. Crystal-controlled harmonic
oscillators provide comb markers with 1 MHz, 10 MHz, or
50 MHz separation . When used with a DC 502 Option 7
Digital Counter, a frequency markerdot can be positioned
anywhere within the frequency range of the SW 503
generator, and the frequency of the marker can be read
directly on the counter. In the MANuaI sweep and CW
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modes, the continuous wave output of the generator can
be read to the counter accuracy .
Access jacks on the front panel permit external signals
to control or modulate the output amplitude and frequen-
cy, and to initiate a sweep .
The SW 503 has a 50 f2 output impedance; the SW 503
Option 1 has a 75
f2
output impedance.
Harmonic Related Spurii : Down 30 dB or more from
10 MHz to 400 MHz; 20 dB or more from 3 MHz to
1 .2
ELECTRICAL CHARACTERISTICS
10 MHz; and 15 dB or more from 1 MHz to 3 MHz.
The following characteristics apply when the SW 503,
in combination with a TM 500-Series power module, is
Non-Harmonic Related Spurii : Down 40 dB or more
operating within an ambient temperatureof0°Cto+50°C,
froml MHzto400MHzfundamentalfrequencyrange .
after a 30 minute or more warmup period .
Output Level
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The
instrument must be calibrated at an ambient
temperature between +20° C and +30° C .
Center Frequency
Dial Accuracy: Within 8 MHz (readout accuracy can be
increased by using the crystal markers or comb, or the
dot marker when the SW 503 is used with a DC 502
Option 7 Digital Counter) .
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Drift: <100 kHz/5 minutes and <2 MHz/8 hours after a
Step
Attenuator Absolute
Ac-
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30-minute warmup at a constant ambient temperature;
curacy
(with
respect
to
zero
a 5-minute stabilization period is required after the
attenuation) : t0 .2 dB/10 dB to a
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center frequency is changed.
maximum of ±1 .0 dB .
NOTE
Range: 1 MHz to 400 MHz or more .
Maximum Width: Selectable ; 400 MHz (+10% - 0%)
Variable : Permits reducing sweep width from maximum
dca+aose
tt3
ag¢XOximatety 2QQ kHz {+nrhe~ in 1Q [+ttHz
maximum width position)
Display Linearity (VAR fully clockwise) :
400 MHz position : 2%
100 MHz position : 3%
10 MHz position : 3%
Signal Purity
Section 1-SW 503
Residual FM : 10 kHz p-p or less in cw position .
RF OUT:
Maximum output is approximately
0.7 V rms. This corresponds to
+10 dBm ±0 .5 dB into 50 C2, or
+57 dBmV ±0 .5 dB into 75
f2 (Op-
tion 1) .
Output level can be attenuated
50 dB in 10 dB steps, and 20 dB by
a
variable
attenuator .
This
provides a range from +10 dBm to
-60 dBm for the
SW 503, or
+57 dBmV
to
-13 dBmV
for
SW 503 Option 1 .
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