Elenco 30MHz Dual Trace - Manual (Page 43)

40
OPERATING INSTRUCTIONS
All POSITION controls and INTENSITY control centered(pointers facing up).
Main Time Base CONTROL TO 1 mS/DIV.
Sweep Mode switch to MAIN.
2. Press the red POWER pushbutton.
3. A trace should appear on the CRT. Adjust the trace brightness with the
INTENSITY control, and the trace sharpness with the FOCUS control.
4. Use the BEAM Finder pushbutton to locate a trace that has been moved off the
screen by the POSITION controls. When the button is pushed, a compressed
version of the trace is brought into view which indicates the location of the trace.
5. When viewing audio and low frequency waveforms below 20 MHz, A better
waveform may be obtained by engaging the 20 MHz/100 MHz pushbutton. This
limits the bandwidth to 20 MHz and filters out high frequency noise and
interference. For waveforms above 20 MHz, the pushbutton must be released to
the 100 MHz position.(100MHz Oscilloscope )
SINGLE TRACE DISPLAY
Either channel 1 or channel 2 may be used for single-trace operation. To observe a
waveform on channel 1:
1. Perform the steps of the “Initial Starting Procedure”.
2. Connect the probe to the CH 1(X) input jack.
3. Connect the probe ground clip to the chassis or common of the equipment under
test. Connect the probe tip to the point of measurement.
4. Move the CH 1 AC/GND/DC switch out of the GND position to either DC or AC.
5. If no waveforms appear, increase the sensitivity by turning the CH 1 VOLTS/DIV
control clockwise to a position that gives 2 to 6 divisions vertical deflection.
6. Position the waveform vertically as desired using the CH 1 POSITION control.
7. The display on the CRT may be unsynchronized. Refer to the “Triggering”
paragraphs in this section for procedures on setting triggering and sweep time
controls to obtain a stable display showing the desired number of waveforms.
DUAL TRACE DISPLAY
In observing simultaneous waveforms on channel 1 and 2, the waveforms are usually
related in frequency, or one of the waveforms is synchronized to the other, although the
basic frequencies are different. To observe two such related waveforms
simultaneously, perform the following: