Subject to change without notice
30
Trigger Coupling Indicates trigger coupling:
(LED scale)
AC: <20Hz - 100MHz
DC: 0 - 100MHz
HF: 1.5kHz - 100MHz
LF: 0 - 1.5kHz
~ : Internal line triggering TV-L: Triggering for TV-line
TV-F: Triggering for TV-frame. Selectable by NORM
buttons (22).
+/- (SLOPE)
Selects the slope of the trigger signal. LED dark =
(pushbutton
rising edge. LED lit ( - ) = falling edge.
+ LED )
TRIG. LEVEL Adjustment of trigger level (knob) in automatic peak
(knob)
(value) and normal triggering.
DEL. POS.
Controls holdoff-time between sweeps. Normal
HOLD OFF
HOLD OFF position = full ccw (x1). In DELAY mode
(knob)
for delay time adjustment; hold off defaults to x1.
NORM
Depressing both pushbuttons simultaneously swit-
(pushbuttons
ches over from automatic peak (value) triggering
+ „NM“ LED)
(NM LED dark) to normal triggering (NM LED lit)
and reverse.
CAL. 1kHz/1MHz Selects calibrator frequency.
(pushbutton switch) Button released: approx. 1kHz,
Button depressed: approx. 1MHz. (mechanical)
0.2Vpp - 2Vpp Calibrator square wave output, 0,2Vpp or 2Vpp.
(test sockets)
COMP. TESTER Connectors for test leads of the Component tester.
(4mm jacks)
COMP. TESTER Switch to convert oscilloscope from Yt or XY to
(pushbutton)
component tester mode and reverse.
Y-POS.I
Controls vertical position of channel I display.
(knob)
INV
Inversion of CH. I display (INV LED lit) and reverse.
(pushbutton
In combination with ADD button = difference CH. II
+ LED)
CH. I.
INPUT CH I
Channel I signal input. Input impedance 1M
Ω
II20pF.
(BNC connector)
AC-DC
Selects input coupling of CH. I vertical amplifier.
(pushbutton
DC = direct coupling (LED lit) AC = coupling via
+ „DC“ LED)
capacitor (LED dark).
GD
GD (LED lit) = signal disconnected from input, Y
(push LED) amplifier input grounded.
VOLTS/DIV.
Channel I input attenuator.
(pushbuttons
<> pushbuttons select Y input sensitivity in mV/div.
LED scale)
or V/div. in 1-2-5 sequence. Deflection coefficient
LED blinking = uncalibrated.
VAR. 2.5:1
Fine adjustment of Y amplitude CH. I. Increases
(knob)
attenuation factor min. by 2.5 (left hand stop). For
amplitude measurement must be in CAL. position
(right hand stop).
POWER
Turns scope on and off.
(pushbutton)
I = ON; O = OFF
FOCUS
Focus control for trace sharpness (mechanical).
(knob)
TR
Trace rotation (mechanical). To align trace with
horzontal field.(potentiometer; graticule line.
Compensates adjustment with influence of Earth’s
magnetic screwdriver)
INTENS.
Intensity control for trace brightness.
(knob)
(mechanical)
X-POS.
Controls horizontal position of trace.
(knob)
AUTO SET
Automatic signal related instrument setting. If in XY
(pushbutton)
or COMP. TESTER mode, the instrument switches
(RS232/Local) over to Yt (DUAL or MONO) mode. The electrical
settings are taken over independent from the
mechanical knob settings. Turning the knob reverts
to the actual mechanical knob setting.
X-MAG. x10
10:1 expansion in the X direction (LED lit). direction
(pushbutton
(LED lit). Max. resolution 10ns/div.
+ LED)
XY
Selects X-Y operation, stops sweep and reverse.
(pushbutton
X signal via CH. II.Caution! Phosphor burn-in
+ LED (15))
without X signal.
DELAY
Selects DELAY mode and reverse. SEA = search,
(pushbutton)
DEL= delay and DTR = after delay trigger. Delay
time settig by DEL. POS. (21) and time coefficient
(TIME/DIV. (12)).
DELAY
Indicates the delay mode. Dark = off, SEA = select
(LED scale)
delay time, DEL = delayed display and DTR =
triggered display after delay.
SAVE/RECALL Briefly depressing calls the set-up memories;
(pushbutton)
LED(18) blinks. Memory location selection (S/R
scale (16)) by NORM buttons (22). Briefly press
SAVE/RECALL for RECALL. Press SAVE/RECALL
until LED stops blinking to SAVE.
TIME/DIV.
Selects time coefficients of timebase, from 0.5s/
(< > pushbuttons) div. to 0.05µs/div. < pushbutton increases >
pushbutton decreases time coefficient. In SEA
(search) DELAY mode, selects for coarse setting
of delay time.
TIME/DIV.
Indicates time coefficient. Blinking indicates uncali-
(LED scale)
brated setting of (14). In seconds ranges the sec
LED is also lit.
VAR. 2.5:1
Variable adjustment of (knob) timebase. Decreases
X deflection speed at least 2.5 fold at left stop. For
time measurements turn to right hand stop.
XY
Indicates XY mode. Dark in Yt (LED) and COMP.
(LED)
TESTER mode.
S/R 1-6
Memory location indicator. Blinking indicates SAVE/
(scale)
RECALL (scale) mode and memory location.
TRIG.
LED above indicates trigger (LED) action (sweep triggered).
Element
Function
Element
Element
Element
Element
Element
Function
Function
Function
Function
Function
Front Panel Elements HM 304
(Brief Description
-
Front View)
