Controls, Connectors, and Indicators
22) CH 1 OR X Conduct external signals to the Channel 1 and Channel
and CH 2 2 vertical inputs. A signal applied to the CH 1 OR X
connector provides the horizontal deflection for an X-Y
display. Each connector includes a coding-ring contact
for Tektronix-coded probes.
Refer to Figure 5-4 for the location of items 23 through 27.
23) CH 3 and
CH 4 Input
Connectors
Conduct external signals to the Channel 3 and Channel
4 vertical inputs. Each connector includes a coding-ring
contact for Tektronix-coded probes. Input coupling from
these connectors is DC only. Channel 3 and Channel 4
are most useful as digital-signal and trigger-signal input
channels, given their limited choice of deflection factors.
^4) POSITION Set vertical position of the Channel 3 and Channel 4
Controls signal displays. The controls operate identically to the
Channel 2 POSITION control, but with less range on
their associated traces.
VOLTS/DIV Toggle between 0.1 V and 0.5 V per division deflection
Switches factors for Channel 3 and Channel 4.
26) CALIBRATOR Provides a 0.4-V p-p square-wave into a 1 Mfi
load,
Connector 0.2-V p-p into a 50
9.
dc-coupled
load,
or 8-mA p-p into
a short circuit. The signal is useful for checking sweeps,
delay-times, and vertical deflection accuracies, as well
as compensating voltage probes and checking the
accuracy of current probes. The repetition rate of the
square wave changes with A-Sweep SEC/DIV changes.
From 100 ms per division to 100 ns per division, the
A Sweep of the instrument supplying the CALIBRATOR
signal displays five cycles per 10 divisions. At 100 ms
per division and slower, the CALIBRATOR frequency is
5 Hz; at 100 ns per division and faster, the frequency is
5 MHz. The signal amplitude at 5 MHz is at least 50%
of the signal amplitude obtained when the sweep speed
is set to 1 ms per division.
5-10
2465B/2455B/2445B Operators
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