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6. TTL output function
The TTL Output is used for testing DIGITAL LOGIC circuits. The output is a fixed amplitude square
wave with a fast Rise and fall time.
This output can be used as a clock generator for testing, repairing and analyzing digital circuitry. The
TTL output can drive 20 or more TTL loads.
7. VCF input function
Applying a voltage to the VCF input causes the output frequency to vary in accordance with the
amplitude of applied voltage. The frequency can be varied with the VCF in 3 ways.
1) The application of an AC voltage will frequency modulated the output frequency according to the
AC Rate and amplitude of the applied voltage
2) If a DC Voltage is applied, the output frequency will change to the new CW value depending on
the amplitude of the applied voltage.
3) The application of a ramp voltage will cause the output frequency to vary linearly according the
ramp time and amplitude; therefore it can be used as an external sweep input.
◈
Frequency selection by DC voltage applied from the exterior
You can select the output frequency regularly by DC voltage applied to VCF IN, which is
equivalent to frequency dial selection. You can use this operation usefully in case you need the
reselection to the regular frequency periodically. To get the accurate frequency select the output
frequency by putting the output frequency measure and the time that you have to control the
frequency dial accurately again on the minimum spot and changing the DC voltage applied to VCF
IN. If you need regular frequency output more than two, you can select the output frequency by
using the switch or electronic switching circuit and by changing DC voltage applied to VCF IN.
◈
Operation as a exterior control sweep generator
Waveform of the ramp voltage that user wants or of the other shape also can be applied to operate
as a exterior control sweep generator. The voltage change from –5V to +5V will sweep the
frequency to the proportion of 100:1. You have to use the SETTING of the equipment as when you
use the interior control sweep generator. But, you have to put the sweep width controller on the ‘0’.
Amplitude of the sweep signal that DC voltage in VCF IN terminal is removed decides the width of
a sweep, and the frequency or iteration ratio decides the ratio of the sweep. Therefore, use it as a
sweep generator that you want by controlling it appropriately.
8. RS232C Interface
1) Hardware and Software requirement:
(5) IBM PC/XT/AT (8088,80286,80386,80486) or Compatible Computer.
(6) Microsoft Windows VER 3.1 OR Windows 95, 98, 2000, ME, NT, XP.
(7) Serial Port for Connection with Instrument.
