Controls, Connectors, and Indicators-2465 Operators
READOUT
DISPLAY
The Readout System provides an alphanumeric display
of information on the crt along with the analog waveform
display. The readout
is
displayed in two rows of 32 char-
acters each. One row is within the top graticule division,
and the other row
is
within the bottom graticule division.
The locations and types of information displayed under
normal operating modes are illustrated in Figure 3-7.
NOTE
Other in forma tion is displayed when the instrument
is in a diagnostic mode or has experienced a fault.
If the normally blank spaces of the bottom row of
the display are filed with dots, refer the instrument
to a qualified service person for recalibration.
Each of the scale-factor displays appears when the
respective vertical channel or sweep
is
displayed. When X-Y
mode
is
selected, the Channel
1
scale factor
is
displayed,
and
CH
1 X
appears in place of the A Sweep scale factor.
Special characters or abbreviations are displayed to
indicate GND or AC coupling of Channel 1 or Channel
2
signals, ADD, CH 2 INVERT, Vertical bandwidth limited,
or HOLDOFF not set to minimum.
The Trigger-Level readout shows the signal voltage
(at the probe tip of encoded probes) that will initiate
the sweep. The readout appears only if the following con-
ditions exist:
a
single vertical channel
is
selected as the
trigger source, the vertical input coupling is not AC, the
VOLTSIDIV VAR control of the source channel
is
in the
calibrated detent, and trigger coupling
is
either DC or
NOISE REJ.
A question mark may appear in
a
DLY (delay time),
a
At (delta time), or a l/At readout when the SECIDIV
knobs are unlocked (not with cursors). This indicates that
either the delay time (or one of the two delay times)
is
set
at
less than
0.5%
of the maximum delay or the
B
TRIG-
GER MODE is set to TRIG AFT DLY. A question mark
will also appear in a l1At display readout when the
difference between the two delays (or the distance between
the two cursors displayed when the A and
B
SECIDIV
knobs are locked together)
is
less than
1%
of full scale.
The
50
s2
OVERLOAD
display appears if excessive signal
is applied to either the CH 1 or the CH 2 input connector
while
50
DC input coupling
is
selected. The readout will
return to the normal display when the input coupling of the
overloaded channel
is
switched.
TRIGGER LEVEL INDICATOR
50
i2
OVERLOAD SWEEP DELAY TIME
DELTA VOLTAGE
DELTA
TlME
TRIGGER SOURCE
/
IIDELTA TlME
(1,2,
3,
OR 4)
TRIGGER CURRENTLY UNDER
CONTROL (A OR
B)
ADD INDICATOR
(+)
CHANNEL 1
SCALE FACTOR
INVERT INDICATOR
(1)
.
CHANNEL 4 SCALE FACTOR
CHANNEL 2
CHANNEL
3
SCALE FACTOR SCALE FACTOR
A SWEEP SCAL
SCALE
.E FACT
FACTOR
'0
R
M
HOLDOFF INDICATOR (HO)
Figure
3-7.
Readout display locations.
REV
FEB
1983
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