Section
2-314
Service
OPERATING INFORMATION
NOTICE
The
314
automatically reduces the display Intensity level when sweep speeds of
10
ms and
slower are selected. This reduces the posslblity of accidentally burning the sensitive storage crf
phosphor at slower sweep speeds.
When changing from sweep speed settlngs faster than
10
ms to
10
ms and slower, readjust the
INTENSITY control setting as necessary for a visible display.
PRELIMINARY
INFORMATION
To effectively operate this instrument, the user should
become familiar with its operation and capabilities. This
section describes briefly the front, side, and rear-panel
controls and connectors.
Safety Information
This manual contains warning information that the user
must follow to ensure safe operation of the instrument.
Warning information is provided to protect the user.
Caution information is provided to protect the instrument
and connected test equipment.
This instrument is intended to be operated from a
single-phase, earth-reference power source having
one current-carrying conductor (the neutral con-
ductor) near earth potential. Operation from power
sources where both current-carrying conductors
are live with respect to earth (such as
phase-to-
phase on a three-wire system) is not recommended,
since only the live conductor has over-current (fuse)
protection within the instrument.
This instrument has a three-wire power cord with a
three-terminal polarized plug for connection to the power
source and safety earth. The safety-earth terminal of the
plug is directly connected to the instrument frame. For
electric-shock protection, insert this plug only into a
mating outlet with a safety-earth contact. If an outlet with a
safety-earth contact is not available, connect the instru-
'ment frame to a safety earth system. The color coding of
the cord conductors is in accordance with recognized
standards given in Table 2-1.
TABLE
2-1
Grounded (Neutral)
/
Blue
1
White
Power Cord Conductor Identification
Grounding (Earthing)
1
Green-Yellow
I
Green-Yellow
Operating Voltage
The 314 has a voltage selector switch (on rear panel)
that permits selection of either a 115- or 230-volt nominal
line voltage source. To change the voltageselector switch
position, disconnect the power cord and use a small
screwdriver to set the selector to the desired range.
Alternate Color Conductor
CONTROLS AND
CONNECTORS
Figures 2-1, 2-2 and 2-3 show front, side, and rear panel
controls and connectors. A brief description of each
control and connector is given. For detailed operating
information, refer to the 314 Operators Manual.
Color
Front Panel (Fig.
2-1)
Display
1. FOCUS, INTENSITY-These are adjusted for a
sharp, bright display. Pull INTENSITY to turn instrument
power on.
2. .5
V
CAL OUT-A source of 0.5-volt square-wave
calibration signal.
Unarounded (Line)
3. LOW LINE-This indicator flashes when the power
supply goes out of regulation due to low power-line
voltage or low dc supply voltage. The Indicator is on
steady for normal supply voltages (pilot light).
Trigger Source
Brown
4.
AC-With this button pushed in, dc signal com-
ponents are rejected and trigger signals below about 30
hertz are attenuated.
Black
5. AC LF REJ-With this button pushed in, dc signal
components are rejected and trigger signals below about
50 kilohertz are attenuated.
NOTE
When both the AC and AC
LF
REJ
buttons are
pushed in (EXT DC), all trigger signals from dc to
10
megahertz are accepted if their amplitude is within
the ranges specified in Table
1-1.
REV.
B,
AUG.
1976
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