Single-Trace Operation - PeakTech 2035 Bedienungsanleitung

Despite their high input impedance, scope probes do not pickup appreciable hum or noise. As was the
case with coaxial cable, the outer conductor of the probe cable shields the central signal conductor.
Scope probes are also quite convenient from a mechanical standpoint.
To determine if a direct connection with shielded cable is permissible, you must know the source
impedance of the circuit you are connecting to, the highest frequencies involved, and the capacitance of
the cable. If any of these factors are unknown, use a 10 X low-capacitance probe.
An alternative connection method at high frequencies is terminated coaxial cable. A feed-thru terminator
have an impedance equal to that of the signal-source impedance is terminated coaxial cable. A feed-thru
terminator having an impedance equal to that of the signal-source impedance is connected to the
oscilloscope input connector. A coaxial cable of matching impedance connects the signal source to the
terminator. This technique allows using cables of nearly and practical length without signal loss.
If a low-resistance ground connection between oscilloscope an circuit is not established, enormous
amounts of hum will appear in the displayed signal. Generally, the outer conductor of shielded cable
provides the ground connection. If you are using plain lead wire, be certain to first connect a ground wire
between the oscilloscope Ground connector (28) and the chassis or ground bus of the circuit under
observation.
WARNING!
The oscsilloscope has an earth-grounded chassis (via the 3-prong power cord). Be certain the
device to which you connect the scope is transformer operated. Do not connect this oscilloscope
or any other test equipment to "AC/DC", "hot chassis", or "transformerless" devices.
Similary, do not connect this scope directly to the AC power line or any circuitry connected
directly to the power line. Damage to the instrument and severe injurt to the operator may result
from failure to heed this warning.
2.2.3

Single-trace Operation

Single-trace operation with single timebase and internal triggering is the most elementary operating mode
of the unit. Use this mode when you wish to observe only a single signal, and not be disturbed by other
traces on the CRT. Since this is fundamentally a two-channel instrument, you have a choice from your
single channel. Channel 1 has an output terminal; use channel 1 if you also want to measure frequency
with a counter while observing the waveform. Channel 2 has a polarity inverting switch. While this adds
flexibility, it is not too useful in ordinary single-trace operation.
1. Set the following controls as indicated below. Note that the trigger source selected (CH 1 or CH 2
Source) must match the single channel selected (CH 1 or CH 2 V MODE)
POWER switch (16)
AC/GND/DC switches (25) (21)
Vertical POSITION controls (4) (17)
VARIABLE controls (27) (20)
V MODE switch (5)
VARIABLE control (13)
Trigger MODE switch (14)
Trigger SOURCE switch (18)
Trigger LEVEL control (9)
2. Use the corresponding Vertical POSITION control (4) or (7) to set the trace near mid screen.
3. Connect the signal to be observed to the corresponding IN connector (24) or (22) and adjust the
corresponding VOLTS/DIV switch (26) or (23) so the displayed signal is totally on screen.
Caution: Do not apply a signal greater than 400 V (DC + peak AC)
4. Set the TIME/DIV switch (15) so the desired number of signal cycles are displayed. For some
measurements just 2 of 3 cycles are best; for other measurements 50-100 cycles appearing like a
solid band works best. Adjust the Trigger LEVEL control (9) if necessary for a stable display
ON (pushed in)
AC
Mid rotation
Fully CW
CH 1 (CH 2)
CAL
AUTO
VERT
Mid rotation
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