Tektronix 2247A Operator's Manual page 18

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Controls, Connectors, and Indicators
of the associated VOL TS/DIV readout. The ground symbol Is also
dlsplayed after the value readout of any of the VOLTMETER
measurements.
AC-Capacltlvely 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
de component of the Input signal. The lower -3 dB frequency limit Is
10 Hz or less when using either a 1 X probe or properly terminated
coaxial cable; It Is 1 Hz or less using a compensated 1 OX probe . With
AC Coupling selected, an AC symbol (-) Is displayed to the right of
the associated VOL TS/DIV readout. An AC symbol is also displayed
after the value readout of any Peak or Peak-to-Peak voltag e
measurement.
NOTE
When AC Coupling is selected for DC voltmeter measure-
ments an error message "SELECT DC COUPLING " Is
displayed.
DC-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 VOL TS/DIV readout. Input resistance Is 1 Mil 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 horizont al
deflection (X-Axls) In the X-Y horizontal mode. Any of the vertlcal
signal channels or ADD can provide vertlcal deflection (Y-Axls) for an
X-Y display.
@
PROBE ADJUST Connector-Outputs a 0.5 V square-wave slgnal
(at about 1 kHz Into a 1 Mil load) for compensating voltage probe s
and checking the vertical deflection accuracy.
2-6
2247 A Operators
]
I
I
I
Controls, Connectors, and Indicators
COUPLING
LJ LJ
COUPLING IRA C f SCP
BEAM FINO
· : t
t5
20MH, -:
•
· H
~
•
PROBE
ADJUST
.n IKHz
®
@
@
@
GNO GNO
BOTH Off BOTH Off
CH1 oR ~ CH 2 CH 3
'@)
~
fl_1Mfl20-pf!400-Vpk"
19 ~ -
Figure 2-3. Vertical connectors and CH 3 and
CH 4 controls.
6373-04
Auxlllary Ground Jack-Provides an auxiliary chassis ground con-
nection (banana jack) between the equipment under test and the
2247A.
Channel 3 and Channel 4 POSITION Controls-Adjust vertical
position of Channel 3 and Channel 4 signal displays
J
Channel 3 and Channel 4 VOLTS/DIV Switches-..Select two basic
deflection factors for Channel 3 and Channel 4 , 0.5 volt/division (but-
ton lit) or 0.1 volt/division (button not lit). '
The VOL TS/DIV switch setting displayed In the crt readout reflects
the attenuation factor of coded attenuator probes that are connected
to the vertical Inputs .
CH 3 and CH 4 Input Connectors-Connect signals to the Inputs of
the Channel 3 and Channel 4 vertical attenuators. Input coupling Is de
only.
The Input connectors are BNC with probe-coding ring contacts (the
same as Channel 1 and Channel 2) . The limited choice of deflection
factors for the Channel 3 and Channel 4 Inputs makes them useful for
digital and trigger signals.
2247 A Operators
2-7