Subject to change without notice
14
Controls and Readout
Each time this pushbutton is briefly pressed, the slope
direction switches from falling edge to rising edge and
vice versa.
The current setting is displayed in the readout under item
“TR: source, SLOPE, coupling”. The last setting in A
timebase mode is stored and still active if the alternate (A
and B) or B timebase are selected. This allows for a
different slope setting regarding the B timebase if the
DEL. TRIG. function is active. The slope direction chosen
for the B timebase is indicated in the readout under “DTr:
SLOPE, coupling”.
(12)TR
- Trigger indicator LED.
The TR LED is lit in Yt mode if the triggering conditions are
met. Whether the LED flashes or is lit constantly depends
on the frequency of the trigger signal.
(13)LEVEL
- Control knob.
Turning the
LEVEL
knob causes a different trigger point
setting (voltage). The trigger unit starts the timebase
when the edge of a trigger signal (voltage) crosses the
trigger point. In most Yt modes the trigger point is
displayed in the readout by the symbol on the left vertical
graticule line. If the trigger point symbol would overwrite
other readout information or would be invisible when
being set above or below the screen, the symbol changes
and an arrow indicates in which vertical direction the
trigger point has left the screen.
The trigger point symbol is automatically switched off in
those modes where there is no direct relation between
the trigger signal and the displayed signal. The last setting
in A timebase mode is stored and still active if alternate
(A and B) or B timebase mode are selected.
This allows for a different level setting for the B timebase
if the
DEL. TRIG.
function is active. Under this condition
the letter
“B”
is added to the trigger point symbol.
(14)X-POS.
- Control knob.
This control knob enables an X position shift of the
signal(s) in Yt and XY mode. In combination with X
magnification x10 this function makes it possible to shift
any part of the signal on the screen.
(15)X-MAG. x10
- Pushbutton and LED.
Each time this pushbutton is pressed the x10 LED located
above is switched on or off. If the x10 LED is lit, the signal
display in all Yt and timebase modes is expanded 10 fold
and consequently only a tenth part of the signal curve is
visible. The interesting part of the signal can be made
visible with aid of the
X-POS.
control. As the X expansion
results in a higher timebase speed (lower time deflection
coefficient), all time and frequency relevant information in
the readout is switched over.
Please note that in alternate timebase mode the inten-
sified sector may become invisible due to the X posi-
tion setting.
This pushbutton is not operative in XY mode.
(16) VOLTS/DIV.
This control knob for channel I has a double function.
The following description relates to the input attenuator
function (VAR LED dark).
Turning the control knob clockwise increases the sensi-
tivity in a 1-2-5 sequence and decreases it if turned in the
opposite direction (ccw.). The available range is from
1mV/div up to 20V/div. The knob is automatically switched
inactive if the channel related to it is switched off, or if the
input coupling is set to
GD
(ground).
The deflection coefficients and additional information
regarding the active channels are displayed in the readout,
e.g. “Y1: deflection coefficient, input coupling”. The
“:”
symbolizes calibrated measuring conditions and is re-
placed by the
“>”
symbol in uncalibrated conditions.
(17)CH I - VAR.
- Pushbutton with several functions.
CH I mode:
Briefly pressing the
CHI
button sets the instrument to
channel I (Mono CH I) mode. The deflection coefficient
displayed in the readout indicates the current conditions
(
“Y1...”
). If neither external nor line (mains) triggering
was active, the internal trigger source automatically
switches over to channel I (
“TR:Y1...”
). The last function
setting of the
VOLTS/DIV (16)
knob remains unchanged.
All channel I related controls are active if the
input (27)
is
not set to
GD (29)
.
VAR.:
Pressing and holding this pushbutton selects the
VOLTS/
DIV. (16)
control knob function between attenuator and
vernier (variable). The current setting is displayed by the
VAR-LED
located above the knob.
After switching the
VAR-LED (16)
on, the deflection
coefficient is still calibrated. Turning the
VOLTS/DIV.
(16)
control knob counter clockwise reduces the signal
height and the deflection coefficient becomes
uncalibrated.
The readout then displays e.g. “Y1>...” indicating the
uncalibrated condition instead of
“Y1:...”
. Pressing and
holding the CHI pushbutton again switches the LED off,
sets the deflection coefficient into calibrated condition
and activates the attenuator function. The previous ver-
nier setting will not be stored.
The
CHI
pushbutton can also be pressed simultaneously
with the
DUAL(18)
button.
Please note item (18)
.
(18)DUAL - XY -
Pushbutton with multiple functions.
DUAL mode:
Briefly pressing this button switches over to DUAL mode.
Summary of Contents for HM 1004-3 Series
Page 1: ...Instruments Oscilloscope HM 1004 3 01 02 03 ENGLISH MANUAL HANDBUCH MANUEL...
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Page 32: ...Subject to change without notice 32 Front Panel HM1004 3...
Page 33: ...33 Subject to change without notice...
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Page 35: ...MANUAL HANDBUCH MANUEL...
