Controls, Connectors,
and
Indicators
®
CH
3 and Conduct external signals
to
the Channel 3 and Channel
CH
4 Input 4 vertical inputs. Each connector includes a coding-ring
Connectors 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.
@
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.
®
CALIBRATOR Provides a
O.4-V
p-p square-wave into a 1 Mn load,
Connector 0.2-V p-p into a 50 n dc-coupled load, or a-rnA 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.
NOTE
The
calibrator signal changes phase during trigger
holdoff.
This
does not affect the accuracy
of
the
calibrator signal that is present during
a sweep.
However,
if
the GAL/BRA
TOR
signal is used with
other instruments, the sweep
of
the instrument
must be shut off.
If
it
is
not, the signal will appear
to
jitter
and will give false (low) frequency counts.
The
sweep
of
the instrument is easily shut
off
by
setting TRIGGER MODE to SGL SEQ.
@
Auxiliary Provides
an
auxiliary signal ground. The jack is
Ground
Jack
compatible with standard banana plugs. A standard
accessory binding post
plugged into the jack provides a
probe ground when probing the CALIBRATOR output
and provides a versatile ground connection.
5-10 2465A/2455A/2445A Operators
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