Tektronix 7844, Инструкция по эксплуатации

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Section 1 -7844/R7844 Operators
OPERATING INSTRUCTIONS
FEATU R ES
The Tektronix 7844/R7844 Dual-Beam Oscilloscope i s a
solid-state, wide bandwidth, dual-beam osc i l l oscope. The
instrument accepts Tektronix 70aO-Series plug-in u n its to
form a complete measurement system. The flex i b i l i ty of
t h e plug-in feature and variety of plug-in units available
a l l ow the system to be used for many measurement applica­
tions.
The 7844/R7844 provides separate vertical and horizontal
deflection systems, FOCUS, I NTE NSITY, and B EAM F I N D ­
E R functions for each beam. T h e plug-in u n it i n either
vertical compartment can be sel ected to provide vertical de­
flection for either beam. The plug-in units in either horizon­
tal compartment may be selected to provide horizontal de­
flection for either beam.
The 7844/R7844 features regulated de power supplies to
ensure that the performance is not affected by variations in
l i n e voltage and frequency, or by changes in load due to vary­
ing power requi rements of the plug-in units. The 7844/R7844
operates from a 1 1 5 volt or 230 volt (50 H z to 400 H z )
nominal l ine source.
Other features i nclude a dual-gun full-overlap crt with a
graticule area of 8 x 1 0 centimeters. The instrument also
provides a crt display of alphanumeric information encoded
by the plug-in u nits_ The R EADOUT display i n dicates plug­
i n u n it status such as deflection factor, sweep rate, and other
p l u g- i n dependent parameters.
The Option 21 instrument is basically the same as the stan­
dard 7844/R7844 except that the vertical deflection system
is ded icated. The amplifier unit in the L E FT V E RT compart­
ment controls the vertica! deflection of beam 1 and the am­
p l i fier unit in the R I GHT V E R T compartment controls the
vertical deflection of beam 2, The V E RTICAL M O D E switch
and V E RT SEP control have been deleted, Refer to the
Options section for details.
P R E L I M INARY OPE RATION
To effectively operate this instrument, the user must be­
come familiar with the operation and capabilities of the in­
strument. This section describes how to use the front and
rear-pane! controls and connectors.
REV. C JAN
1977
Safety I n formation
This instruction manual contains warning information which
the user must follow to ensure safe operation of the instru­
ment. Warning information is intended to protect the opera­
tor and Caution information is intended to protect the
instrument.
This instrument is in tended to be operated from
a single-phase earth-referenced power source
having one current-carrying conductor (th e Neu­
tral Conductor) near earth potential. Operation
from power sources wh ere both current-carry­
in g conductors are live with respect to earth
(such as phase-to-phase on a three-wire system)
is not recommended� since only the Line Con­
ductor has over-current (fuse) protection with·
in the instrument.
This instrument has a three-wire power cord
with a three-terminal polarized plug for connec­
tion to the power source and safety-earth. The
safety-earth terminal of the plug is directly con­
nected to the instrument frame. For electric­
shock protection, insert this plug only in a mat­
ing outlet with a safety-earth contact or oth er­
wise connect the frame to a safety-earth system.
The color-coding of the cord conductors;s in
accordance with recognized standards.
Power Cord Conductor identification
Conductor
Color
Alternate Color
Ungrounded (Line)
Brown
Black
Grounded ( N eutral )
Blue
White
Grounding (Earthing) Green-Yellow
Green-Yellow
Operating Voltage
The 7844/R7844 has a VOLTAGE SELECTOR switch which
allows selection of either a 1 1 5 volt or 230 volt nominal l ine
voltage source. When changing the Voltage Selector switch
position, disconnect the power cord and use a small screw­
driver to move the Voltage Selector switch to the desired
range.
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