Front Panel Elements Hm304 (Brief Description - Front View) - Hameg HM304 Manual

Front Panel Elements HM 304 (Brief Description - Front View)
Element Function
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).
30
Element Element Element Element Element Function Function Function Function Function
Trigger Coupling Indicates trigger coupling:
(LED scale) AC: <20Hz - 100MHz
HF: 1.5kHz - 100MHz
~ : 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 1MΩII20pF.
(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
(pushbutton + 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).
DC: 0 - 100MHz
LF: 0 - 1.5kHz
Subject to change without notice