Model 4013DDS - Instruction Manual
10
8.
-20dB – Attenuates the amplitude of the selected output waveform by 20-dB.
9.
DUTY CYCLE ON/OFF – Enables operation of the variable duty cycle function.
10.
DUTY CYCLE – Adjusts, after pressing the pushbutton, the duty cycle of the Square
waveform, when selected.
11.
OUTPUT – BNC connector for output of selected waveform; 20V peak-to-peak into open
circuit or 10V peak-to-peak into 50 ohms.
12.
SYNC OUT – A square wave with TTL levels in phase with the main output. Useful for
synchronization of external devices.
13.
SWEEP – The ON selects the Linear, Logarithmic sweep. The SET selects the START
and STOP frequencies of the seep and also the RATE repetition of the sweep selected.
Front Panel View
3.2 INSTRUMENT INPUTS AND OUTPUTS
The Model 4013 main output impedance is 50
. The output can deliver up to 10V peak-to-peak
waveforms into a 50
load. Proper signal loading and connection is necessary for the generator
main output to meet its specifications. An RG-58 coaxial cable equipped with BNC connectors and
terminated with a 50
feed through termination is recommended. Using the 50
terminator
minimizes signal reflection and power losses on the line due to the impedance mismatch. At higher
frequencies, an un-terminated or improperly terminated output will cause aberrations on the output
waveform.
Impedance Matching
If the waveform generator is driving a high impedance, such as the 1 M
input impedance of an
oscilloscope vertical input, connect the transmission line to a 50 ohms attenuator or a 50 ohms
termination and to the oscilloscope input. The attenuator isolates the input capacitance of the device
and terminates the waveform generator properly.
3.3 SYNC OUTPUT
A square wave output signal at the main output frequency is available at this output, producing
TTL levels with a 50
source impedance. This output is protected from short circuit and can drive
a minimum of 20 TTL loads. Leads connected to the SYNC OUT should be as short as possible to
prevent rounding of the TTL pulse. The SYNC output signal symmetry is changed by using the
DUTY CYCLE control for all selected waveforms.
Summary of Contents for 4013DDS
Page 1: ...1 Model 4013DDS 12 MHz Sweep Function Generator...
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