Leader LBO-516 Instruction Manual
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Leader LBO-516 Instruction Manual

100 mhz delayed time base oscilloscope
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Summary of Contents for Leader LBO-516

  • Page 2 WARNING! THE SERVICING INSTRUCTIONS CONTAINED IN THIS MANUAL ARE FOR USE BY QUALIFIED PERSONNEL ONLY. TO AVOID ELECTRIC SHOCK, DO NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN THE OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO.

  • Page 3: Table Of Contents

    LBO-516 100 MHz DELAYED TIME BASE OSCIILOSCOPE TABLE OF CONTENTS 1. GENERALINFORMATION............................1 1-1 INTRODUCTION ..........................1 1-2 SPECIFICATIONS ..…..........................1 2. OPERATING INSTRUCTIONS..........................3 2-1 FUNCTION OF CONTROLS, CONNECTORS, AND INDICATORS ............3 2-1-1 Display Block ............................3 2-1-2 Vertical Amplifier Block ........................... 4 2-1-3 Sweep and Trigger Blocks .........................

  • Page 4: Generalinformation

    1. GENERAL INFORMATION 1-1. INTRODUCTION 1-2. SPECIFICATIONS The LBO-516, shown in Figure 1-1, is a 100 MHz oscilloscope Specifications for the model LBO-516 oscilloscope are given in with all of the features normally found on a lab-grade scope: high- Table 1-1.
  • Page 5 Signal Delay Leading edge displayed. Modes Auto, Normal, Single-shot Leading edge displayed. CH-1 only, CH-2 only, Coupling AC, DC, HF reject, TV vertical, TV CH-1 & CH-2 displayed alternately, horizontal CH-1 & CH-2 chopped (at 250 Slope + or- kHz rate), Holdoff Normal, Variable (to greater than CH-1 &...

  • Page 6: Operating Instructions

    This section contains the information needed to operate the Display device having 1 cm square LBO-516 and utilize it in a variety of basic and advanced graticule lines inscribed on the inner measurement procedures. Included are the identification and function...

  • Page 7: Vertical Amplifier Block

    2-1-2 Vertical Amplifier Block Refer to Figure 2-2 for references (10) to (12) and (14) to (23). Refer to Figure 2-3 for reference (13). VOLTS/DIV switches To select the calibrated deflection factor of the input signals fed to the vertical amplifier. VARIABLEcontrols Provide continuously variable adjustment of deflection factor between...

  • Page 8: Sweep And Trigger Blocks

    2-1-3 Sweep and Trigger Blocks MULT control, and under some Refer to Figure 2-3 for reference (24) to (42). circumstances also by the START switch (32). ATIME/DIV and To select either the calibrated B push-button sweeps the CRT at the rate selected by the B TIMEY DIV DELAY TIME sweep of the main (A) time-base...
  • Page 9 SOURCE switch To select the signal used for A or B When triggered B sweep is selected as time-base triggering. the horizontal-display mode, and the CH-1 position selects the channel 1 COUPLING switch is set to any signal for triggering. CH-2 position position other than TV-V, the A- and selects the channel 2 signal for B- time base trigger signals are...

  • Page 10: Miscellaneous

    Disconnect the power cord from the Power Connector (45). Remove the 14 Phillips-head screws around the periphery of the Power Connector Permits removal or replacement of AC top and bottom covers. power cord. Remove the covers and carefully turn the LBO-516 upside down.

  • Page 11: Installation

    If lack of working space requires that the instrument be placed 1 for the selected voltage range. In all cases the fuse must be the on the floor, stand the LBO-516 on end. The Cord Caddy (47) will delayed-action ("SLO-BLOW') type.

  • Page 12: Basic Operating Procedures

    Fully CW, and The following paragraphs in this section describe how to operate pushed in the LBO-516, beginning with the most elementary operating modes, V MODE switches (21) ....and progressing to the less frequently-used and/or complex modes. 2-3-1 Signal Connections Vertical POSITION controls (17 &...

  • Page 14: Single-Trace Operation

    .02/KS position of the A TIME/DIV switch LBO-516. Use this mode when you want to observe only a results in too many cycles displayed, pull the A VARI- single signal, and not be disturbed by other traces on the ABLE (X10 MAG) control (28) outwards.
  • Page 15 and a vertically-deflected but non-synchronized display when The 0.2 V/DIV and 2 V/DIV positions both select vertical signal is present but the trigger controls improperly external trigger signal applied to the EXT TRIG IN set. This immediately indicates what is wrong. The only connector (35).
  • Page 16 (fast rise and fall current waveform each time the timebase is swept. This is sometimes difficult to achieve, so the LBO-516 has three times). However, this particular pulse is the output of a leading-edge triggered monostable, and has pulse-width jitter.

  • Page 17: Probe Compensation

    2-3-4 Probe Compensation between the end of one sweep and the start of the next (in The LP- 100X probes furnished with the LBO-516 must be response to a trigger pulse). This prevents the triggering of adjusted to the input capacitance of the. channel(s) with which subsequent sweeps by the wrong trigger pulse in a complex they are used.

  • Page 18: Dual-Trace Operation

    ..............(PRESET level) but of how to display the two channels. Horizontal POSITION control (29) ....APS* The LBO-516 is set up for dual-trace operation as follows: *As previously set. 1. Set the following controls as indicated below. Any controls not **See Step 6.

  • Page 19: Additive And Differential Operation

    CH-1 and CH-2 signals. In differential operation, the resultant trace represents the algebraic difference between the CH-I and CH-2 signals. To set up the LBO-516 for additive operation, proceed as follows: Set up the dual-trace operation per paragraph 2-3-5, Steps 1 to 6 and 8 to I0.

  • Page 20: Triple-Trace Operation

    2-3-7 Triple-trace Operation effective sweep speed by a factor of 10, so .02 PS/div be- A very useful feature of the LBO-516 is that the timebase comes 2 KS/div. trigger can be displayed on the CRT screen along with the two If CH-1 and CH-2 are both handling signals of the same vertical inputs.

  • Page 21: Delayed Timebase Operation

    CRT screen. This will set the sum trace (CH- 1 + CH-2) near the center graticule line. follows: NOTE: The position of the sum trace is not separately 1. Set up the LBO-516 as directed for whatever vertical mode you desire. controllable. Make sure the START pushbutton (32) is out.
  • Page 22 B Intensity Adjustment. The B trace brightness varies relative to A trace brightness as the difference in A and B TIME/DIV switch setting varies. The B INTEN control (4) allows compensatory adjustment for the brightness difference. This control can be rotated clockwise for increased brightness. If necessary, adjust the A/B TRACE SEP control (33) so the B timebase trace(s) do not overlap the A timebase traces.

  • Page 23: Single-Shot Operation

    After the second time, the READY lamp (38) will light. mode. The only problem with this is that main timebase jitter The LBO-516 is now ready to display the transient. When it becomes apparent in the B sweep when at high ratios of A to B occurs, the TRIG'D lamp (41) will flash, and the timebase TIME/DIV switch settings (100:1 and up).

  • Page 24: Measurement Applications

    When making either type of measurement, ensure that the VARIABLE controls 1. Set up the LBO-516 for the vertical mode desired per the (11) are rotated fully clockwise and de-tented in their CAL'D instructions in 2-3 BASIC OPERATING PROCEDURES.

  • Page 25: Differential Measurement Techniques

    3. Position the AC/GND/DC switch (16) to GND. VOLTS/DIV setting. In the example used for Figure 2-15, 4. Use the appropriate vertical POSITION control (17) or the voltage for a 0.5 V/div scale is 2.5 V (5.0 div X 0.5 V). (18) to set the baseline on the central horizontal graticule line.

  • Page 26: Time Interval Measurements

    70 mS = 21.4% applies to the more specific procedures and variations that follow. 1. Set up the LBO-516 as described in 2-3-2 Single-trace Lead and Lag Time. When two signals have the same fre- Operation. quency, but not the same phase, one signal is said to be leading, Set the A TIME/DIV switch (24) so that the interval you wish to measure is totally on screen and as large as possible.

  • Page 27: Phase Difference Measurements

    If the points between which the time difference exists are less Set the B TIME/DIV switch (25) to a position 50 to 100 than 1 major division apart and located in the middle of complex times (5 to 6 positions) faster than the A TIME/DIV switch waveforms that are otherwise in phase, use the delayed (B) setting.
  • Page 28 100 MHz. To measure phase difference by the dual-trace method, proceed as follows: Set up the LBO-516 as described in 2-3-5 Dual-trace Operation, connecting one signal to the CH-1 IN connector (14) and the other to the CH-2 IN connector (15).

  • Page 29: Distortion Comparison

    To measure phase difference by the Lissajous pattern 2-4-5 Distortion Comparison method, proceed as follows: The dual-trace feature of the LBO-516 offers a quick method Depress the X-Y switch (20). of checking for distortion caused by a signal-processing device CAUTION: Reduce the trace intensity, lest the (such as an amplifier).

  • Page 30: Frequency Measurements

    10. The rise and fall times measured thus far include the 3.5 KS display resembles a circle, an ellipse, or a diagonal line. transition times of the LBO-516 (about 5 KS with probe). When this occurs the unknown frequency is the same as the These errors are negligible if the measured rise and fall times signal generator frequency (which can be read from its dial).

  • Page 31: 3Db Bandwidth Measurement

    2-4-8 -- 3 dB Bandwidth Measurement Bandwidth measurement usually involves finding the -3 dB response point in the frequency-response curve of a circuit or device. This can easily be determined without the need for calculations or dB conversions by using the following "trick": Connect the output of a constant-amplitude signal generator (of appropriate frequency range) to the input of the de-vice- under test (DUT).

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