Hameg HM 1004-3 Series, Manual

Page: 19 / 36

19
Subject to change without notice
Controls and Readout
Input coupling:
Briefly pressing this pushbutton switches over from AC
(
~ symbol) to DC ( = symbol) input coupling and vice versa.
The setting is displayed in the readout with the deflection
coefficient.
Probe factor:
Pressing and holding the pushbutton selects the indi-
cated deflection coefficient of channel II displayed in the
readout, between 1:1 and 10:1. In condition 10:1 the
probe factor is thus indicated by a probe symbol displayed
by the readout in front the channel information (e.g.
“probe symbol”, Y2...). In the case of cursor voltage
measurement, the probe factor is automatically included.
Please note:
The symbol must not be activated unless a x10 (10:1)
attenuator probe is used.
(33)GD - INV. - Pushbutton with two functions.
GD:
Each time this pushbutton is pressed briefly, the input is
switched from active to inactive and vice versa. It is
displayed in the readout as an earth (ground) symbol
instead of the deflection coefficient and the
~ (AC) or =
(DC) symbol.
The GD setting disables the input signal, the AC/DC (32)
pushbutton and the VOLTS/DIV (20) knob. In automatic
trigger mode the undeflected trace is visible representing
the 0 Volt trace position.
The ”0 Volt” position is indicated by a ”
⊥
” symbol in the
readout. Please note Y-POS. II (10) .
INV.:
Pressing and holding this pushbutton switches the chan-
nel II invert function on or off. The invert “on” condition
is indicated by the readout with a horizontal bar above
“Y2” (Yt mode). The invert function causes the signal
display of channel II to be inverted by 180°.
In XY mode the invert function of channel II is auto-
matically switched off.
(34)TRIG. EXT.
This BNC socket is the external trigger signal input. Briefly
pressing the
TRIG. (19) pushbutton, until the information
“TR:EXT, slope, coupling” is visible in the readout and
the TRIG. “EXT” -LED is lit, switches the input active. The
outer (ground) connection is galvanically connected to the
instrument ground and consequently to the safety earth
contact of the line/mains plug.
Below the CRT there are the controls for the readout,
the component tester and the squarewave calibrator
with their outputs.
Please note:
The following description of the cursor related con-
trols assumes that the readout is visible and the
component tester is switched off.
(35) MENU - Pushbutton
Pressing and holding the pushbutton activates the display
of the
MAIN MENU . It contains the submenus SETUP
and CALIBRATE .
Once a menu is displayed, the following pushbuttons are
of importance:
1. SAVE and RECALL (7) pushbutton.
Briefly pressing selects the submenu or an item within
the submenu.
2. SAVE (7) pushbutton SET function.
Pressing and holding the SAVE (7) pushbutton calls (sets)
the menu or the previously selected item. In those cases
where the item is marked ON/Off the setting changes
from
ON to OFF or vive versa.
If " PRESS SECURITY KEY " is displayed, this function is
available only for HAMEG authorized workshops. Press
AUTOSET (3) to switch back to the menu.
3. AUTOSET (3) pushbutton.
Each time the AUTOSET pushbutton is pressed the
menu switches back one step until MAIN MENU is
displayed. Then pressing the AUTOSET pushbutton again
switches the menu operation off and AUTOSET is set to
the normal function.
(36)ON/OFF - CHI/II - 1/
∆∆∆∆∆
t
This pushbutton has several functions.
ON/OFF:
Pressing and holding the pushbutton switches both cur-
sor lines on or off. As the cursor lines are part of the
readout, they are visible only if the readout is switched on.
CHI/II:
This function is required and available only in DUAL
and XY mode in combination with
∆∆∆∆∆
V (38)
measurement. Briefly pressing the button switches
between channel I and channel II and vice versa.
In DUAL mode the measured result is displayed by the
readout with “
∆∆∆∆∆
V1: ... ” or “
∆∆∆∆∆
V2: ... ” providing the
deflection coefficient is calibrated. The settings of the
cursors must relate to the signal of the selected channel.
In XY mode the instrument is automatically set to
∆∆∆∆∆
V
measurement. In this mode two signals are normally
applied causing an X and a Y deflection. The deflection
coefficient selected for each channel may be different,
thus as in
DUAL mode the
∆∆∆∆∆
V cursor measurement
requires a channel selection. Under channel I (Y signal)
measuring condition the cursor lines are displayed as
horizontal lines and the readout displays
“
∆∆∆∆∆
VY: ... ”
(calibrated). Briefly pressing the pushbutton changes to
channel II (X signal) voltage measurement. Then the cursor
lines are displayed as vertical lines and the readout
indicates “
∆∆∆∆∆
VX> .. . ” (uncalibrated).
In CH I or CH II mono mode, only one deflection coeffi-
cient is present and there is no requirement to select