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Model 204C/D
SECTION I
GENERAL INFORMATION
1-l. INTROlJlJCTION.
1-2. This section contains general information
about the
-hp. Model 204C, the -hp. Model HZO-204C, and -hp. Model
204D Oscillators. Throughout
this manual the instrument
will be referred to as the Model 204C/D when referring to
aI1 instruments, and the Model 204C, the Model H20.204C,
or the Model 204D when referring
to one of the instru-
ments individually.
1.3. SPEClFlCATlONSANDGENERALINFORMATION.
1-4. Table
1-l
lists the specifications
for the Model
204C/D. Table 1-2 lists other useful information
about the
instruments which is not specified.
l-5. DESCRIPTION.
1-6. The Model 204C/D is a wide range oscillator
with a
sine wave output at frequencies from 5 Hz to 1.2 MHz The
output
impedance is 600 ohms; and the maximum voltage
output is 5 V rms into open circuit, or 2.5 V rms into a 600
ohm load
I-7. The Model 2C4D is basically the same instrument
as
the Model
204C, except
the Model
204D has a step
attenuator
added.
l-8. The Model 204C has a variable output with greater
than 40 dB attenuation,
providing
a minimum open circuit
output
of less than
SO mV
rms. The
Specification
H20-204C has greater than 20 dB attenuation.
In addition,
the H20-204C is obtainable
with the Opt. 02 Power supply
board only.
1.9. The Model 204D has greater than
10 dB variable
attenuation
and 80 dB step attenuation
in 10 dB steps,
providing a minimum
open circuit output of less than 150
#V rms.
l-10. The output
of the Model 204C/D may be isolated
from the cabinet
and power
line ground.
This floating
output is balanced to better than 40 dB for frequencies up
to 20 kHz
1-11. The Model 204CjD may be synchronized
with other
instruments.
The SYNC connector
on the front
panel
provides a sync output signal greater than 100 mV rms over
the entire frequency
range, OI accepts at external
sync
signal from another sowx. This permits the Model 204C/D
to be synchronized
with another signal sauce of the same
frequency 01 harmonic thereof.With
a 5 V rms (z 7 V peak)
sync input signal, the external source may vary as much as
t/-5%
in frequency
and the Model 204C/D will remain
synchronized.
p/o TaMe 1-I. Specifications.
RANGES
Frequency: 5 Hz to 1.2 MHz in 6 overlapping ranges
PERFORMANCE
Dial Accuracy: t/-3% of frequency setting
Flatness (At maximum
output into 600 ohms resistive
load I kHz reference):
5
100
300k
1.2M
W)
Hum and Noise: Less than 0.01% of output of 2.5 V rms
into a 100 kHz BW (10 Hz to 100 kHz) with the
204CiD tuned above 200 Hz.
Distortion
at 2.5 V rms into 600 ohms, or 5.0 V mx
open wait:
OU'IT'UT CHARACTERISTICS
Output
Control:
204C, greater
than 40 dB range,
continuously
adjustable.
H20,204C, greater than 20
dB range continuously
adjustable. 204D, greater than
10 dB continuously
adjustable and 80 dB in IO dB
steps.
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