C O N T R O L S A N D I N D I C A T O R S
12
PULL (—) SLOPE:
Two-position push-pull switch. The “in” position
selects a positive-going slope and the “out”
position selects a negative-going slope as
triggering point for main sweep.
27.
EXTernal TRIGger Jack.
External trigger input
for single- and dual-trace operation.
DIGITAL STORAGE CONTROLS
28.
STORAGE/ANALOG Pushbutton.
When
released, scope is in
ANALOG
mode. When
engaged, scope is in digital
STORAGE
mode. In
ANALOG
mode, all digital mode controls (29–3 8)
are disabled. In
STORAGE
mode, all digital mode
controls (29–38) are enabled.
In
STORAGE
mode with all digital mode controls
(29–38) released, scope is in
REFRESH
mode of
storage, in which it updates the stored waveform
each time an adequate trigger signal is received (if
the previous update has been completed).
REFRESH
mode is applicable at all
TIME/DIV
settings.
29.
SAVE CH2 Pushbutton.
Engaging this switch
freezes and stores the channel 2 trace immediately.
The channel 2 display and memory cannot be
updated until this switch is released.
30.
SAVE ALL Pushbutton.
Engaging this switch
freezes and stores the channel 1 and channel 2
traces immediately. The display and memory cannot
be up-dated until this switch is released.
31.
SLOW X100 Pushbutton.
Engaging this switch
expands the time base settings of 10 ms/div to 0.5
S/div by a factor of 100 to become settings of 1
sec/div to 50 sec/div. Time base settings are normal
when this switch is released.
32.
ROLL Pushbutton.
Engaging this switch selects
the
ROLL
mode of operation, in which the trace
moves across the CRT from right to left like a strip
chart recorder (opposite of conventional oscilloscope
operation) and the display is continuously updated.
This update takes place even in the absence of any
trigger signal. The rolling speed equals the
TIME/DIV
setting (and
SLOW X100
if engaged).
ROLL
mode is applicable only at time base settings
of 10 ms/div to 0.5 S/div.
33.
SINGLE Pushbutton.
Engaging this switch
enables the single sweep mode of digital storage
operation, in which the memory is filled in a single
sweep and continuously displayed. Single sweep
mode is applicable for all “real time” settings of the
TIME/DIV
control, that is, 20 s/div and slower.
34.
RESET Pushbutton.
With the
SINGLE
switch
engaged, this switch readies the scope for single
sweep
operation. A suitable trigger signal arriving after
pressing the
RESET
switch initiates the single
sweep.
35.
READY Indicator.
Lights when the
RESET
switch readies
the scope for single sweep, and goes out when trigger signal
occurs.
36.
PRE-TRIGGER Pushbuttons.
Selects post-trigger or
pre-trigger storage conditions. In post-trigger condition (0%
pre-trigger), the entire stored waveform occurs after the trigger.
The trigger point is at the extreme left of the display, as in a
conventional analog oscilloscope display. In pre-trigger
conditions, a portion of the waveform occurring before the
trigger is displayed. Pre-trigger selections of 25%, 50%, and
75% are selectable. For 0% pre-trigger, release both
PRE-TRIGGER
pushbuttons. For 25% pre-trigger, engage the
left pushbutton. For 50% pre-trigger, en-gage the right
pushbutton. For 75% pre-trigger, engage both pushbuttons.
Pre-trigger operation is applicable only to single sweep
operation, not to
ROLL
or
REFRESH
modes.
37.
Data Out
Sends data to USB BMP.
38.
Transfer Indicator.
When flashing, indicates waveform being
stored to USB drive.
REAR PANEL CONTROLS
(see Fig. 2)
39.
Fuse Holder/Line Voltage Selector.
Contains fuse and selects
line voltage.
40.
Power Cord Receptacle.
41.
USB Host connector.
Store screen data to USB flash drive.
42.
Analog Output.
Output terminal where sample of channel 2
analog signal is available. Amplitude of output is 50 millivolts
per division of vertical deflection seen on CRT when
terminated into 50 ohms. Output impedance is 50 ohms.
43.
Factory use only
Not used.
