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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