Tektronix 5441 Instruction Manual page 23

Operating Information-54411~5441
brightness level from an off level, and approximately -5 V
will turn the display off from a normal brightness level. 'Gray
scale" intensity modulation can be obtained by applying sig-
nals between these levels. Maximum safe input voltage is
5
5 V. Usable frequency range of the Z-Axis circuit is dc to
2 MHz.
Time markers applied to the EXT INTENSITY INPUT pro-
vide a direct time reference on the display. With uncalibrated
horizontal sweep or X-Y operation, the time markers pro-
vide a means of reading time directly from the display. How-
ever, if the markers are not time-related to the displayed
waveform, a single-sweep display should be used (for inter-
nal sweep only) to provide a stable display.
C A U T I O N
Calibrator
The internal calibrator provides a convenient signal
source for checking basic vertical gain and sweep timing.
The calibrator signal is also very useful for adjusting probe
compensation, as described in the probe instruction manual.
The output square-wave voltage is 400 mV, within 1% and
the square-wave current is 4 mA, within 1%. The frequency
of the square-wave signal is twice the power-line frequency.
The signal is obtained by clipping the probe to the loop.
Display Photography
A permanent record of the crt display can be obtained
with an oscilloscope camera system. The crt bezel provides
integral mounting for a Tektronix oscilloscope camera. The
instruction manuals for the Tektronix oscilloscope cameras
include complete instructions for obtaining waveform
photographs.
OPERATING VOLTAGE
This instrument is designed for operation from a pow-
er source with its neutral at or near earth (ground)
potential, and with a separate safety-earth conductor.
It is not intended for operation from two phases of a
multi-phase system, or across the legs of a single-
phase, three-wire system.
Panel (Dust Cover) Removal
Dangerous potentials exist at several points through-
out the oscilloscope. When the instrument must be
operated with the cabinet panels removed, do not
touch exposed connections or components. Some
transistors have voltage present on their cases. Dis-
connect power before cleaning the instrument or re-
placing parts.
The cabinet panels (dust covers) of the 5441 are held in
place by slotted fasteners. To remove the panels, turn each
fastener counterclockwise a quarter turn with a large screw-
driver, coin, or similar device. Then the panels can be lifted
away. The instrument should be operated with the panels in
place to protect the interior from dust, and to eliminate
shock hazard.
Table 2-1
POWER CORD CONDUCTOR IDENTIFICATION
Power Transformer
Conductor
Ungrounded (Line)
Grounded (Neutral)
Grounding (Earthing)
The transformer permits operation from 100 V, 110 V,
120 V, 200 V, 220 V, and 240 V sources with power-line fre-
quencies of 50 to 400 Hz. The range for which the primary
taps set is marked on the rear panel of the instrument. Use
the following procedure to obtain correct instrument opera-
tion from the line voltage available.
1. Disconnect the instrument from the power source.
Color
Brown
Blue
Green-Yellow
2. Remove the bottom dust cover of the instrument to
gain access to the Power Supply circuit board.
Alternate
Color
Black
White
Green-Yellow
REV MAY 1982