GW Instek GOS-6112 User Manual
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GW Instek GOS-6112 User Manual

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GOS-6112 OSCILLOSCOPE
USER MANUAL
CONTENTS
1.
PRODUCT INTRODUCTION................................................
1-1.Description.......................................................
1-2.Feature............................................................
2.
TECHNICAL SPECIFICATION................................ 4
3.
PRECAUTIONS BEFORE OPERATION.....................
3-1.Unpacking the instrument....................................
3-2.Checking the Line Voltage....................................
3-3.Environment.....................................................
3-5.CRT Intensity...................................................
4.
PANEL INTRODUCTION........................................
4-1.Front Panel.......................................................
4-2.Rear Panel.......................................................
5.
OPERATION METHOD..........................................
5-1.Readout Display..................................................
5-2.Connecting Input Signals......................................
5-3.Adjustment and Checks.......................................
5-4.Function Check..................................................
5-5.Basic Operation..................................................
5-6.Measurement Application.....................................
6.
MAINTENANCE...................................................
6-1.Fuse Replacement...............................................
6-2.Line Voltage......................................................
6-3.Cleaning..........................................................
7.
BLOCK DIAGRAM................................................ 53
 i 
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GOS-6112 OSCILLOSCOPE
USER MANUAL

SAFETY TERMS AND SYMBOLS

These terms may appear in this manual or on the product:
WARNING. Warning statements identify condition or
practices that could result in injury or loss of life.
CAUTION. Caution statements identify conditions or
practices that could result in damage to this product or
other property.
The following symbols may appear in this manual or on the product:
DANGER
ATTENTION
High Voltage refer to Manual Conductor
 ii 
Protective
Earth(ground)
Terminal
Terminal

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  • Page 1: Table Of Contents

    GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL CONTENTS PAGE SAFETY TERMS AND SYMBOLS PRODUCT INTRODUCTION..........1-1.Description………………………………………………. These terms may appear in this manual or on the product: 1-2.Feature…………………………………………………... TECHNICAL SPECIFICATION………………………….. 4 WARNING. Warning statements identify condition or PRECAUTIONS BEFORE OPERATION…….…………..
  • Page 2 GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL This cable/appliance should be protected by a suitably rated and FOR UNITED KINGDOM ONLY approved HBC mains fuse: refer to the rating information on the equipment and/or user instructions for details. As a guide, cable of 0.75mm...

  • Page 3: Product Introduction

    No. 7-1, Jhongsing Rd., Tucheng City, Taipei County 236, Taiwan GOOD WILL INSTRUMENT (SUZHOU) CO., LTD. No. 69 Lushan Road, Suzhou New District Jiangsu, China. The GOS-6112 is a 100MHz, two-channel, dual-sweep, portable oscilloscope declares that the below mentioned product for general purpose use. A microprocessor-based operating system controls...

  • Page 4: 1-2.Feature

    GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL 6) Trigger signal output 1-2.Features The signal selected by the TRIGGER SOURCE is available. This Additionally, the oscilloscope offers several other features: output may be used to connect to a frequency counter or other 1) High intensity and internal graticule CRT instrument.

  • Page 5: Technical Specification

    GOS-6112 OSCILLOSCOPE USER MANUAL 2.TECHNICAL SPECIFICATIONS Sensitivity 2mV~5V/DIV,11 step in 1-2-5 sequence Sensitivity Accuracy ±3% (5 DIV at the center display ) Continuously variable to 1/2.5 or less than Vernier Vertical Sensitivity panel-indicated value Frequency Bandwidth(-3dB) DC ~ 100MHz (2mV/DIV:DC ~ 20MHz) Rise Time 3.5ns (2mV/DIV:17.5ns)
  • Page 6 GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL Horizontal Modes MAIN(A), ALT, DELAY(B) Voltage 25mV/DIV approx. in 50Ω termination TRIGGER 50nS~0.5S/DIV, continuously variable SIGNAL Frequency Response DC~10MHz A (main) Sweep Time (UNCAL) OUTPUT Output Impedance 50Ω approx. B (delay) Sweep Time...

  • Page 7: Precautions Before Operation

    GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL 3.PRECAUTIONS BEFORE OPERATION 3-3.Environment 3-1.Unpacking the Oscilloscope The normal ambient temperature range of this instrument is from 0° to The product has been fully inspected and tested before shipping from the 40°C (32° to 104°F). To operate the instrument over this specific temperature range may cause damage to the circuits.

  • Page 8: Panel Introduction

    Trace Rotation control, all other controls are electronically selected, and their functions and settings can therefore be stored. The front panel is subdivided into six sections: Display controls Front panel of GOS-6112 Vertical controls Horizontal controls Trigger controls Measurement control Input connectors ...

  • Page 9: 4-1.Front Panel

    GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL 4-1.Front Panel (3).TRACE ROTATION Display controls The TRACE ROTATION is for aligning the horizontal trace in The display controls adjust the on-screen appearance of the waveform and parallel with graticule lines. This potentiometer can be adjusted with a provide a probe compensation signal source.
  • Page 10 GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL (7).20MHz BWL – Pushbutton with indicator LED. (11)TRACE SEP Briefly pressing the pushbutton, the bandwidth is reduced to approx. The instrument contains a trace separate function which is required in 20MHz, and the measurement is made by eliminating undesired high the alternate time base mode to separate the DELAY time base trace(s) frequency signal from the waveform.
  • Page 11 GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL (13)CH1 VOLTS/DIV. (17)CH1 AC/DC. (14)CH2 VOLTS/DIV– Control knob for channel 1/channel 2 has double (18)CH2 AC/DC function. Pressing the pushbutton briefly to switch over from AC (~ symbol) to Turning the knob clockwise to increase the sensitivity in 1-2-5 sequence DC (= symbol) input coupling.
  • Page 12 GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL Horizontal controls: (22)MAIN/ALT/DELAY—X-Y – Pushbutton for time base mode The horizontal controls select the time base operation mode and adjust the selection. horizontal scale, position and magnification of the signal. The instrument contains two-time base designated MAIN and DELAY.
  • Page 13 GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL coefficient (uncalibrated i.e. “DLY>0.125ms”). The width of the SETUPS LOCK window segment decreases when the DELAY time coefficient is set to Pressing and holding the pushbutton, then switch the panel setups lock a lower value (higher time deflection speed).
  • Page 14 GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL Trigger controls NML (Normal) The trigger controls determine the sweep start timing for both signal and Select the normal mode, the input signal will trigger the sweep when dual trace operation. the TRIGGER LEVEL control is set within the peak-to-peak limits of TRIGGER an adequate trigger signal.
  • Page 15 GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL (28)COUPLING –Pushbutton and indicator LEDs. Pressing the pushbutton to select the trigger coupling. The actual (29)SOURCE—Pushbutton and associated LEDs. setting is indicated by a LED and by the readout (“source, slope, AC”).
  • Page 16 GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL (30)DELAY-HO—Control knob with a double function and associated (31)TV-V/TV-H—Pushbutton for video sync signal selection. LED. TV-V The control knob has two different functions depending on the time Start the main trace at the beginning of a video signal field. SLOPE base mode.
  • Page 17 GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL Measurement and Panel setting Control Input connectors The measurement section controls the on-screen readout and the cursor The input section is where the input signals are commonly connected to measurements. the oscilloscope.

  • Page 18: 4-2.Rear Panel

    GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL 4-2.Rear Panel (38)EXT—This BNC socket is the external trigger signal input. In dual X-Y mode, signals at this input are used for the X deflection. The rear panel provides input power and additional signal connections.

  • Page 19: Operation Method

    GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL (42)Z-Axis Input—BNC socket 5. OPERATION METHOD Connect external signals to the Z-axis amplifier for intensity modulating the CRT display. This terminal is DC-coupled. The This section contains basic operation information and techniques that intensity is lowered by a positive signal, while it is increased by a should be considered before proceeding any measurement.

  • Page 20: 5-2.Connecting Input Signals

    GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL 5-2.Connecting Input Signals Grounding The most reliable signal measurements are made when the oscilloscope and the unit under test are connected by a common reference (ground lead) in addition to the signal lead or probe. The ground lead of the probe provides the best grounding method for signal interconnection and ensures the maximum amount of signal-lead shielding in the probe cable.

  • Page 21: 5-3.Adjustment And Checks

    GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL 5-3.Adjustments and checks Trace Rotation Adjustment 7. Observe the displayed waveform and compare them with the Normally, when the trace is in parallel with the center horizontal graticule waveforms shown in figure 5-2. If either probe needs to be adjusted, line, there will be no need to adjust the TRACE ROTATION.

  • Page 22: 5-4.Function Check

    GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL 5-4.Function Check 4. Set both CH1 and CH2 COUPLING to GND. When you start to check the operation of your oscilloscope, proceed the 5. Use the CH1 and CH2 POSITION controls to align both traces on the following instruction: center graticule.

  • Page 23: 5-5.Basic Operation

    GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL 5-5.Basic Operation Displaying the sum or difference of CH1 and CH2 Displaying CH1 or CH2 To display the algebraic sum or difference of CH1 and CH2, proceed the To display the signal from a signal channel, pressing briefly the CH1 or following steps: CH2 pushbutton to set the oscilloscope to channel 1 or channel 2.
  • Page 24 GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL Comparing Frequency and phase (Single X-Y Operation) Setting up Dual X-Y Operation To compare the frequency and phase between two signals by using the To use the oscilloscope in the dual X-Y mode, proceed the following steps: X-Y mode.
  • Page 25 GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL 2. Set the MAIN/ALT/DELAY button to ALT mode, and set the time Magnifying Waveform Events range of the DELAY TIME/DIVE control to be magnified. Use the ×10 MAG pushbutton to view small portions of a waveform as...
  • Page 26 GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL Figure 5-11(a) Figure 5-12(a) TV-V Figure 5-12(b) TV-H The polarity of the synchronization pulse is critical for the slope selection. The figure 5-13(a) and 5-13(b) shows the examples of TV polarity synchronization signals.

  • Page 27: 5-6.Measurement Application

    GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL 5-6.Measurement Application Figure 5-14: Cursor Measurement (a).Typical △ V (Voltage difference) for AC The oscilloscope has a cursor measurement system for making accurate, direct-readout voltage, time, frequency and phase measurements. The voltage.
  • Page 28 GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL (g).Typical △ Θ cursor function for phase 1. Set the VOLTS/DIV and VAR controls to provide an exact five-division vertical display. measurement. 2. Use the vertical POSITION control to control the negative amplitude...

  • Page 29: Maintenance

    GOS-6112 OSCILLOSCOPE GOS-6112 OSCILLOSCOPE USER MANUAL USER MANUAL 6-3.Cleaning 6.MAINTENENCE To clean the oscilloscope, use a soft cloth dampened in a solution of mild The following instructions are executed by qualified personnel only. To avoid detergent and water. Do not spray cleaner directly onto the oscilloscope electrical shock, do not perform any servicing other than the operating because it may leak into the cabinet and cause damage.

  • Page 30: Block Diagram

    GOS-6112 OSCILLOSCOPE USER MANUAL 7.Block Diagram  53 ...

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