Set-up information for both the standard 7844/R 7844 and
Option 21 precedes each major section of this Familiariza
tion Procedure. The control settings for plug-in units and
signal connections, when needed, are also given.
Set-Up I nformation
Set front-panel controls as fol lows:
POW E R switch
CAL I B R ATOR ( 1 kHz)
R EADOUT I NTENSITY
EXT/B EAM 2 GATED
G R AT I L LUM
EXT/BEAM 2 GATED
A T R I G SOU RCE
B T R I G SOU RCE
BEAM 1
I NTENSITY
FOCUS
V E RTICAL MODE
B E AM F I N D E R
H O R I ZONTAL M O D E
H O R I Z SEP ( 1 )
BEAM 2
I NTENSITY
FOCUS
V E RTICAL MODE
BEAM F I N D E R
H O R I ZONTAL MODE
@
Off
4 V push button in
O F F
BEAM 2 GATED
(push button OUT)
Fully counterclock
wise
BEAM 2 GATED
(push button OUT)
L E F T
R I G H T
Midrange
Midrange
L E F T
Push button o u t
A
Midrange
Midrange
Midrange
R I G HT
Push button out
B
Operating Instructions-7844/R7844 Operators
L
Connect the 7844/R7844 to a power source that meets
the voltage and frequency requirements of the instrument.
If the available l i ne voltage is outside the l imits of the Vol
tage Selector, see Operating Voltage discussion in this section.
2. Install Tektronix 7A-Series amplifier units into both the
L E F T V E RT and R I G H T V E RT compartments. Install Tek
tronix 7B-Series time-base units into the A and B H O R I Z
compartments.
3. Turn the POWER switch ON.
4. Connect the 4 V C A L I B RATOR output to the left and
right vertical plug-in units with a B N C cable and a dual in
put coupler.
5,
Set the deflection factors of both vertical u n i ts for 2
divisions of d isplayed signa! and center the position controls,
Set both u n i ts for dc input coupling.
6. Set both time-base units for a sweep rate of 1 m i l l isecond/
division, Set the triggering for auto mode with ac coup l i ng
from the internal sou rce and the level control for a stable
display. Position the display as necessary.
Display Controls
7. R otate the B EAM 1 and BEAM 2 I NTENSITY controls
throughout thei r ranges; then set the I NTENSITY controls
to a desired viewing level.
8. Set the B EAM 1 FOCUS control so that the top and bot·
tom portions of the beam 1 display are as thin as possible
but not elongated. Set the BEAM 2 FOCUS control so that
the top and bottom portions of the beam 2 display are as
thi n as possible but not elongated.
NOTE
This instrument contains circuitry to automati
cally protect the crt against damage due to ex�
cessive crt beam curren t If th e IN TENSI TY
control is set to a point where crt phosphor
damage could occur, this circuit limits the beam
current to a safe level. The circuit action will
also cause the trace
to
defocus which indicates
that the intensity should be reduced. There
fore, if the FOCUS adjustment cannot be satis
factorily made, reduce the IN TENSI TY and
repeat step 8.
1-3
