Section
4-7844/R7844
Operators
INSTRUMENT OPTIONS
Your i nstrument may be equipped with one or mroe instrument options. A brief description of each option is given in the
following discussion. Option information is incorporated into the appropriate sections of the manual. Refer to Table 4-1 and
the Table of Contents for location of option information.
Conversion kits, for most options, are available and can be installed at a later time. For further information on instrument
options, see your Tektron i x Catalog or contact your Tektronix Field Office.
O PT I O N
3
This option provides electromagnetic shielding so that the instrument w i l l meet the emi (electromagnetic interference) para
meters given in the Specification section of this manua l . To meet emi specifications of instruments equipped with Option 3,
all unused plug�in compartments must be covered with an emi-shielded blank plug-in panel (Tektronix part 0 1 6-01 55-00). One
blank pane! is required for each unused plug-in compartment.
OPT I O N
21
This option e l i minates the V E RT I CA L MODE switch, thereby dedicating the LEFT V E RT plug-in compartment to beam 1
and the R I G HT V E RT plug-in compartment to beam 2_ The V E RT SET ( 1 ) control is also e l iminated.
OPT ION
78
Option 78 al lows selection of P1 1 cathode-ray tube phosphor. Cathode-ray tubes with P1 1 phosphor provide maximum photo
graphic writing speed for the 7844/R7844.
OPTION 22
This option provides a n oscilloscope enhancer to effectively increase the writing rate for single�shot photographs. Photographic
writing speed is i ncreased by providing raster scanning of the crt at the end of beam 2 sweep. Option 22 is recommended when
a camera equipped with a writing speed enhancer is not available.
O P E RATI N G I N F O R MATION
CONTROLS A N D CONN ECTORS
The major controls required for the operation of the 7844/
R7844 Option 22 (Writing Speed Enhancer) are located on
the front pane! of the instrument. However, the Readout
Mode Switch is l ocated on the Readout circuit board inside
the instrument. A brief description of the controls unique
to Option 22 will follow.
R EADOUT I NTENSITY/PULSED ENHANCER
(PULSED Mode)
Varies the brightness of the readout display. In the counter
clockwise detent ( O F F ) , the pulsed readout and enhancer
functions are i noperative. In the clockwise detent, the read
out system and the enhancer system are in the PULSED
mode_ The R EADOUT P R ESET, E N HANCER P R E SET,
EXTE R N A L or BEAM 2 GATED, and MANUAL functions
are activated i n the PULSED mode.
REV.
A, MAY,
1975
R EADOUT I NTENSITY/PULSED E N HANCER
EXTER NAL or B EAM
2
GATE D Switch (PULSED
Mode)
In the BEAM 2 GATED mode (push button out ) , one raster
scan display is provided for single sweep enhancement and
one readout frame
IS
displayed at the end of beam 2 sweep.
When i n the EXTE RNAL mode (push button i n ) , an input
(ground closure) to the rear-panel G RAT/READOUT
S I N G L E SHOT connector provides one raster scan and one
display of readout signal.
R EADOUT AND E N HANCE R MANUAL Switch
( P U LSED Model
Displays one raster scan and one readout frame when the
MANUAL push button is pressed.
R EADOUT PR ESET Adjustment (PULSED Mode)
Controls brightness of readout portion of the crt display,
when operating in the PULSED mode.
E N HANCER PR ESET Adjustment (PULSED Mode)
Varies the brightness of the raster scan display for single
sweep enhancement.
4-1
