Elenco 30MHz Dual Trace - Manual (Page 44)

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OPERATING INSTRUCTIONS
1. Connect probes to both the CH 1(X) and CH 2(Y) input jacks.
2. Connect the ground clips of the probes to the chassis or common of the
equipment under test. Connect the tips of the probed to the two points in the circuit
where waveforms are to be measured.
3. To view both waveforms simultaneously, set the VERTICAL MODE switch to
DUAL and select either ALT (alternate) or CHOP with the PULL CHOP switch.
4. In the ALT sweep mode (PULL CHOP switch pushed in), one sweep displays the
channel 1 signal and the next sweep displays the channel 2 signal in an
alternating sequence. Alternate sweep is normally used for viewing high-
frequency or high-speed waveforms at sweep times of 1 ms/DIV and faster, but
may be selected at any sweep time.
5. In the CHOP sweep mode (PULL CHOP switch pilled out), the sweep is chopped
(switched) between channel 1 and channel 2. Using CHOP, one channel does not
have to “wait” for a complete swept display of the other channel. Therefore,
portions of both channel's waveforms are displayed with the phase relationship
between the two waveforms unaltered. Chop sweep is normally used for low-
frequency or low-speed waveforms at sweep times of 1 ms/DIV and slower; or
where the phase relationship between channel 1 and channel 2 requires
measurement.
If chop sweep is used at sweep times of 0.2 ms/DIV and faster, the chop rate
becomes a significant portion of the sweep and may become visible in the
displayed waveform. However, you may select chop sweep at any sweep time for
special applications.
6. Adjust the channel 1 and 2 POSITION controls to place the channel 1 trace
above the channel 2 trace.
7. Set the CH 1 and CH 2 VOLTS/DIV controls to a position that gives 2 to 3 divisions
of vertical deflection for each trace. If the display on the screen is unsynchronized,
refer to the “Triggering” paragraphs in this section of the manual of procedures for
setting triggering and sweep time controls to obtain a stable display showing the
desired number of waveforms.
8. When the VERTICAL MODE switch is set to ADD, the algebraic sum of CH 1 + CH
2 is displayed as a single trace. When the PULL INV switch is pulled out, the
algebraic difference of CH 1 CH 2 is displayed.
9. If two waveforms have no phase no phase or frequency relationship, there is
seldom reason to observe both waveforms simultaneously. However, these
oscilloscopes do permit the simultaneous viewing of two such unrelated
waveforms, using alternate triggering. Refer to the paragraphs on “Triggering
Trigger SOURCE Switch”, for details on alternate triggering.