Handling Instruction - PeakTech 4025 Bedienungsanleitung

* Amplitude controller is a digit-analogue converter. Based on the amplitude value preset by user, it
generates a corresponding analogue voltage and then multiplied by the output signal so to guarantee the
amplitude of output signal to be the preset value. Offset controller is a digit-analog converter. Based on the
offset value preset by user, it generates a corresponding analog voltage and then added with the output
signal so to guarantee the offset of output signal to be the preset value. The synthesized signal from
amplitude and offset controllers is amplified by the power amplifier and then is output from output end A.
3.3. Working principle of operation control
* MPU controls keyboard and display parts by interface circuit. When the key is pressed, MPU identifies the
code of pressed key and then executes the corresponding commands. Display circuit displays the working
state and parameters of the generator using menu characters.
* The knob on the panel can be used to change the number in the position of cursor. A trigger pulse will be
generated for each rotating of 15° . MPU can judge whether 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.

4. Handling instruction

* Frequency modulation(FM)
* Exterior measurement
* Parameter calibration
4.1. General operation rule
4.1.1. Data input
* If an item is selected, the parameter value can be entered by ten numeric keys writing from left to right. If
there are more than one decimal point entered in a parameter, only the first one is valid. For the function
of "Offset", minus can be entered. To make the data come into effect, unit key must be entered after data
input. For wrong data input, there are two ways to modify. If the output end permits wrong output signal,
press any unit key to end and then re-enter data. If the output end does not permit wrong output signal, re-
select the same item and enter correct data, and then press unit key to end it.
* The input of data can use any assorted decimal point and unit, but the generator will display it in fixed
format. For example, the data 1.5kHz or 1500Hz entered will be effective displayed as 1500.00Hz.
* Take the unit key as the ending of a data entering. The corresponding unit, Hz, V, ms, % or dB, will be
displayed. No display for other units.
4.1.2. Step entering method
* In practice, a group of equidistant frequencies or amplitudes is needed. It will be a messy job to use
numeric key entering method. Using knob will be also inconvenient as the distant value is multi-digit. It can
be easily reached by step entering method. To simplify the operation, the step function for the frequency
and amplitude of channel A is set. By the simple step key, the frequency or the amplitude can be added or
subtracted a step. Besides, the changed frequency will come into effect at once without pressing the unit
key.
* To generate a series of frequencies with the distant of 12.5kHz, for example, the sequence of pressing is
as follows: Press
of【1】【2】【.】【5】【kHz】; The frequency of channel A will be added by 12.5Hz at each pressing of
the key of 【∧】and the frequency of channel A will be reduced by 12.5Hz at each pressing of the key
of【∨】. Now a series of increasing-by-distant or decreasing-by-distant frequencies with the step of
12.5kHz are obtained in fast and accurate way. The Step entering method can only be used in the
frequency of channel A or the amplitude of channel A.
4.1.3. Knob adjusting
* In practice, signal needs to be adjusted sequentially sometimes, so number adjusting knob will be used.
There is a blink position of cursor in the numeric display. Press the key of 【＜】 or 【＞】 to move the
blink cursor leftwards or rightwards. Rotate the knob on the panel can adjust the number sequentially with
the key of
【Menu】
to select "Step
-28-
frequency"; press the keys