Hameg HM304, Manual

Page: 31 / 31

31 Subject to change without notice
CH I & CH II Pushbuttons for Mono CH I and CH II, DUAL and
(pushb ADD selection. Mode indication by LED(s) deflecti-
„ADD“ LED)
on coefficient coefficient scale. In Yt mode at least
one LED on a scale lit. To switch over to the other
channel activate that channel (pressing CH I or CH
II) causing DUAL mode. Then switch off the
previous channel by depressing the respective
channel pushbutton. In combination with internal
triggering the triggersource follows the mono
channel setting. For algebr. addition depress CH
and CH II simultaneously (ADD LED lit). Depressing
both pushbuttons simultaneously again reverts to
the previous setting.
TRIG. Triggersource selection in internal trigger mode.
(pushbutton Depressing in DUAL mode causes the switch over
+ LED‘s) from trigger source channel I (TR I) to trigger source
channel II (TR II) and reverse. Depressing the
pushbutton until both TR I and TR II LED‘s lit,
switches over to alternate triggering if DUAL mode
is active. Depress again to quit alternate triggering.
Not available in combination with ext. triggering, XY
or COMP. TESTER modes.
INPUT CH II Channel II signal input.
(BNC connector) Input impedance 1M
Ω
II 20pF.
AC-DC Selects input coupling of CH. II vertical amplifier.
(push DC = direct coupling (LED lit)
„DC“ LED) AC = coupling via capacitor (LED dark).
GD GD (LED lit) = signal disconnected from input,
(pushbutton Y amplifier input grounded.
+ LED)
VOLTS/DIV. Channel II input attenuator. <> pushbuttons select
(pushbuttons Y input sensitivity in mV/div. or V/div. in 1-2-5
+ LED scale) sequence. Deflection coefficient LED blinking =
uncalibrated.
VAR. 2.5:1 Fine adjustment of Y amplitude (knob) CH.II.
Increases attenuation factor min. by 2.5 (left hand
stop). For amplitude measurement must be in CAL.
position (right hand stop).
EXT Pushbutton selects between internal and external
(pushbutton trigger source. If the EXT LED lights the trigger
+LED) signal originates from the TRIG. INP. socket (44).
Y-POS.II Controls vertical position of channel II display.
(knob)
INV Inversion of CH. II (display LED lit) and reverse.
(pushbutton and reverse. In combination with ADD button =
+LED) difference CH. II CH. I.
TRIG. INP. External triggersignal input.
(BNC-connector) Active if the EXT LED lit.
Element Function Element Function
Ω Ω