Tektronix 2247A

Controls, Connectors, and Indicators
of the associated VOLTS/DIV readout. The ground symbol Is also
displayed after the value readout of any of the VOLTMETER
measurements.
AC—Capacitively couples the input signal to the vertical attenuator
when the AC button Is lit.
Turning on AC Coupling turns off DC Coupling. AC Coupling blocks the
dc component of the Input signal. The lower -3 dB frequency limit is
10 Hz or less when using either a 1X probe or properly terminated
coaxial cable; It Is 1 Hz or less using a compensated 10X probe. With
AC Coupling selected, an AC symbol (~) Is displayed to the right of
the associated VOLTS/DIV readout. An AC symbol is also displayed
after the value readout of any Peak or Peak-to-Peak voltage
measurement.
NOTE
When AC Coupling is selected for DC voltmeter measure-
ments an error message “SELECT DC COUPLING” is
displayed.
OC—Couples de and all frequency components of the Input signal to
the vertical attenuator when the DC button Is lit.
Turning on DC coupling turns off AC coupling. With DC Coupling
selected, a DC symbol ( == ) Is displayed to the right of the associ-
ated VOLTS/DIV readout. Input resistance is 1 MQ to ground.
Refer to Figure 2-3 for location of items 18 through 23
CH 1 OR X and CH 2 Input Connectors—Connect signals to the
Inputs of Channel 1 and Channel 2 vertical attenuators,
Input
connectors
are
BNC
type
with
an
outer
contact
ring
for
recog-
nizing
attenuation
factors
of
coded
attenuator
probes.
A signal
con-
nected
to
the
CH
1
OR
X
Input
connector
produces
the
horizontal
deflection
(X-Axis)
in
the
X-Y
horizontal
mode.
Any
of
the
vertical
signal channels or ADD can provide vertical deflection (Y-Axis) for an
X-Y display.
PROBE ADJUST Connector—Outputs a 0.5 V square-wave signal
(at about 1 kHz into a 1 MC. load) for compensating voltage probes
and checking the vertical deflection accuracy.
2247A Operators
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