Amplitude controller is a multiplication digital-analog converter, analog signal that has been filtered is the
voltage standard of the digital-analog converter, this standard multiplies amplitude value inputting with the
numeric key to make output signal frequency be equal to this inputting value. Offset controller is also a
multiplication digital-analog converter, a high-accuracy DC voltage standard of which multiplies offset value
inputting with the numeric key to make the output signal offset be equal to this inputting value. The
synthesized signal from amplitude and offset controllers is amplified by the power amplifier and voltage
amplifier then output from output port.
4.3. Control working principle
Micro-controller controls the keyboard and display parts with interface circuit, when a key is pressed, the
micro-controller recognizes the code of pressed key and executes corresponding command program of this
key. The display circuit will work to display the instrument’s working state and each parameter.
Switch the adjusting knob on the panel to change the digit on the cursor position, generating a trigger pulse
every 15° rotation. The microprocessor could judge the rotation is left or right, if it is left, the number in the
position of cursor will be subtracted by 1; if it is right, the number in the position of cursor will be added by 1
with continuous carry or borrow.
5. Chapter 3 Reference
5.1. Data input
5.1.1. Input with the numeric keys
Select an option and input with the numeric keys the parameters of this option. The ten digit keys are of the
function of inputting data from left to right one by one. Point is allowed in this data, but only the first one is
valid when more than one points inputted. Under “offset” function, minus may be input. The digit keys input
digit to the display area which do not work yet and could be deleted by pressing
【＜】
, or select this option
again, to input right one if it is a wrong input, but these must happen before pressing an unit key. End the
digits input and make them valid by pressing an unit key.
For any input by pressing the point key and the units, the generator will display this input in its own certain
form. Such as, the generator displays 1.50000 kHz for both of input of 1.5 kHz and 1500 Hz.
5.1.2. Adjust with the adjusting knob
In actual operations, users may use the adjusting knob to continuously adjust the signal. Press
【＜】
or
【＞】
to move the cursor left or right. Rotate the adjusting knob on the front panel right to add the digit on
the cursor position by 1, it can do a carry to the former; rotate the adjusting knob left to subtract the digit on
the cursor position by 1, it can borrow digit from the former. The digit adjusted by the adjusting knob works
immediately and no need to press unit key. Move the cursor to the left to do rough adjusting by the knob, and
to the right to do fine adjusting.
5.1.3 Selection of the inputting means
For known data, it is the most convenient to use numeric keys to input as it can be gotten easily without the
generating of transient data no matter how big the change of the data is, which is so important in some
operations. For the modifying of the entered data or for entering sequence data to observe, it will be more
convenient to use the adjusting knob. So user should select flexibly according to the different applications.
5.2. CHA continuous
“CHA continuous” means CHA outputs stable and continuous signal, of which the waveform, frequency,
amplitude and phase will not change along with time.
Press
【
Shift
】【
CHA/CHB
】
key, select “CHA” option and then set the parameters of CHA.
5.2.1. Frequency setting
Press
【
Freq
】
key, the light of which will be on, press “Hz” unit to display present frequency value. Input
frequency value with numeric keys or adjusting knob and the signals of this frequency will be output from the
output port.
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