The functions of each knob of the 6502 dual-trace oscilloscope
The 6502 dual-track oscilloscope can not only perform single-track display, but also display the instantaneous process of two different electrical signals on the screen at the same time, as well as display the waveform of the superimposed two signals. The instrument has the characteristics of wide frequency bandwidth (DC-20 MHZ), high sensitivity (maximum deflection coefficient 1 mV/div), large display screen, special internal scale, no parallax waveform, automatic focus and alternate triggering.
Plug the power supply into an AC outlet and send the specified voltage to the voltage converter. Check the rated voltage indicated on the voltage selector and protect it with the corresponding fuse.
(1) Power switch (ON/OFF). The power switch is a button switch. If the switch is pressed, the power is turned on; if the switch is released, the power is turned off.
(2) Power indicator. When the power is turned on, the indicator light is on.
(3) INTENSITY knob (INTENSITY) 0 If it is turned clockwise, the brightness will be brighter; otherwise, it will gradually become darker, and it should be turned fully counterclockwise before connecting to the power supply.
(4) Focus knob (FOCUS). Operate the brightness knob to adjust the brightness to an appropriate level, and adjust the focus knob until the light trace is the clearest.
(5) Cursor rotation regulator (TRACE/ROTATION). Due to the influence of the geomagnetic field, the optical trace and the horizontal scale line are inclined. This knob is used to adjust the two to be parallel to each other.
(6) Scale brightness knob (SCAIEILIUME). If the knob is turned clockwise, the brightness will increase; otherwise, it will decrease.
(7) Fuse holder power converter (rear panel) (NOMINAL). Select the power supply for the oscilloscope.
(8) AC socket (rear panel) (VOLTAGEE). The AC outlet is the power cord connector.
1. Vertical axis part
(1) CH1 input terminal. The external input signal acts on the oscilloscope through the CH1 socket.
(2) CH2 input terminal. Same as CH1, the external input signal acts on the oscilloscope through the CH2 socket.
(3) AC, GND, DC switch. It is used to select a combined system including input signal and vertical amplifier.
① AC: Through the capacitor connection, the DC component in the input signal is cut off, and only the AC part is displayed.
② GND: The input of the vertical axis amplifier is grounded, which is mainly used as a reference when testing the DC level.
③ DC: The signal input to the oscilloscope contains both AC and DC components.
(4) Voltage sensitivity knob (VOLTS/DIV). The vertical deflection coefficient is converted, and the range is converted according to the size of the input signal, so that the signal amplitude is easy to observe.
(5) Voltage fine adjustment knob (VARIABLE). It is used to fine-tune the amplitude change in the direction of the vertical axis (V axis). Usually, the knob is in the correction position when it is turned clockwise to the end.
(6) X5MAG vertical expansion key. Press the X5MAG switch to expand the vertical gain by 5 times.
(7) Vertical displacement (t; POSITION) knob. Used to shift the scan line in the vertical direction on the screen.
(8) Inverted button (INVERT) 0 The signal from inverted work mode to CH2 is displayed with inverted polarity.
(9) CH1/CH2 channel buttons. CH1 or CH2 can be selected in single-channel working mode; in dual-channel working mode, it can be used to select internal trigger signal source CH1 or CH2. The pop-up button is CH1, and the button is CH2. When the vertical mode is selected as ALT and the trigger mode is selected as ALT, this key has no selection function. The oscilloscope is in the alternate trigger mode to observe two signals with no time relationship.
(10) ADD button. The signals added to CH1 and CH2 are switched at a fixed frequency of approximately 250 kHz and are displayed intermittently on the screen.
Press at the same time, the oscilloscope works in ADD mode, displaying the algebraic sum or algebraic difference of the CH1 and CH2 signals.
2. Horizontal shaft part
(1) TIME/DIV switch. Used to change the scan time 0.1 “/div~0.2 s/div (20 gears).
(2) XY mode key. Press this key to stop scanning, and input the signal from the external to the X and / axis. At this time, the instrument is used as an X and y oscilloscope (when used to observe Lissajous graphs, the X signal is added to CHI, and the Y signal is added to CH2). The adjustment knob corresponding to the input socket of the, adjust its deflection sensitivity VOLTS/DIV and vertical displacement.
(3) Horizontal displacement (a POSITION) o It is used to shift the scan line in the horizontal direction on the screen.
(4) X5MAG. The signal period is expanded by 5 times, and the actual period is 1/5.
(5) When dual display (ALT, MAG) O is alternately expanded, the non-expanded x 1 scan line and the expanded x 5 scan line of each channel are simultaneously displayed on the screen.
(6) TRACE SEP separation knob. Only in the ALT, MAG mode is used to adjust the vertical position of the extended x5 scan line to the non-extended xl scan line, so that the two are separated.
3. Trigger
(1) Trigger source selection switch (SOURCE) o INT: internal trigger mode; ALT: alternate trigger; LINE: power trigger; EXT; external trigger.
(2) External trigger input connector.
(3) Trigger level knob (TRIG/LEVEL). Used together with the trigger slope selection switch to adjust the position of the trigger pulse formed on the signal waveform.
(4) Trigger the slope selection switch (SLOPE). Pressing the switch is the slope, and lifting it is the “+” slope.
(5) Trigger mode selection switch (TRIG/MODE).
AUTO: Automatically scan continuously when there is no trigger signal. Once there is a trigger signal, it will immediately switch to the trigger scan state.
NORM (Normal): Line sweep will only occur when the input signal is triggered.
TV-H (line): TV line frequency is used as a synchronization signal.
TV-V (frame): TV frame rate is used as a scan synchronization signal.
Note: TV-V and TV-H are synchronized only when the synchronization signal is.
(7) CAL (calibration) 0.5V terminal. This is a 1 kHz, 0.5 V rectangular wave output terminal for calibration, used to calibrate the probe.
(8) GND terminal. The GND terminal is a ground terminal.
