Operating Instructions; Operating Temperature; Operating Position; Plug-In Units - Tektronix 7844 Instruction Manual

Operating instructions—7844/R7844 Operators
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° CAUTION
PPL LLL PS
Damage to this instrument may occur if the
Voltage Selector switch is set to an incorrect
position for the line voltage applied.
Voltage Selector
Switch Pasition
115 Vv
230 V
Regulating
Range
90 to 132 volts
180 to 264 volts
Operating Temperature
The 7844/R7844 can be operated where the ambient air
temperature is between 0°C and +50°C. After storage at
temperatures beyond the operating limits, allow the chassis
temperature to come within the operating limits before
power is applied.
The 7844 is cooled by air drawn in through holes in the
side and bottom panels and blown out through the fan ex-
haust. To ensure proper cooling of the 7844, maintain the
clearance provided by the feet on the bottom and allow 2
inches clearance on the top, sides, and rear (more clearance,
if possible}. The R7844 is cooled by air drawn in through
the air filter on the rear panel and blown out through holes
located on the side panels. To ensure proper cooling of the
R7844, refer to the dimensional drawing in Section 3 of
this manual (Fig. 3-6).
A thermal cutout disconnects power from this instrument
if the internal temperature exceeds a safe operating level.
Power is automatically restored when the temperature re-
turns to a safe level.
Operating Position
A bail-type stand is mounted on the bottom of the 7844.
This stand permits the instrument to be tilted up about 10°
for more convenient crt viewing.
PLUG-IN UNITS
The 7844/R7844 accepts up to 4 Tektronix 7000-Series
plug-in units. This feature allows selection of bandwidth,
sensitivity, display mode, etc., and provides for future ex-
pansion of the system.
The overall capabilities of the system are determined mainly
by the characteristics of the plug-ins selected. Some typical
combinations are given under Applications, in this manual,
along with simplified set-up instructions, For information
on other plug-in units, refer to the current Tektronix catalog.
installation of Plug-In Units
Plug-in units can be installed or removed without turning
the instrument power off. To install a plug-in unit into a
compartment, align the slots in the top and bottom of the
plug-in unit with the associated guide rails in the plug-in
compartment. Insert the plug-in unit into the compartment
until it locks into place. To remove a plug-in unit, pull the
release latch on the plug-in unit to disengage it. To meet
emi specifications, all unused plug-in compartments should
be covered with an emi-shielded, blank plug-in panel, Tek-
tronix Part 016-0155-00.
The 7844/R7844 Calibration procedure given in the Service
manual normalizes the vertical and horizontal gains. This
allows plug-in units to be interchanged between plug-in com-
partments without recalibration. The basic calibration of
the plug-in units should be checked when installed to verify
their accuracy (refer to plug-in operating instructions}.
CONTROLS AND CONNECTORS
Figure 1-1 and Figure 1-2 show the front and rear panels. A
brief description of each contro! and connector is given. Re- a
fer to Detailed Operating Information in this manual for
additional operating information.
Front-Panel Color Coding
Portions of the 7844/R7844 front-panel are color-coded.
These color-coded areas are defined by their functions. Red
identifies the nomenclature and controls that will uncalibrate
the instrument. Biue identifies the controls affecting the
crt display mode. Green identifies all trigger controls.
Other colors such as gray, orange and yellow, have no func-
tional assignments, but are used as needed to indicate the
relationship between controls and/or connectors.
FAMILIARIZATION PROCEDURE
The following procedure may be used for familiarization
with the 7844/R7844 or as a check of basic instrument op-
eration. ff performing the Familiarization Procedure reveals
improper calibration or instrument malfunction, first check
the operation of the associated plug-in units; then refer to
the Calibration and Maintenance sections of the 7844/R7844
Service manual.