Hameg HM504-2 Manual Download Page 15

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Subject to change without notice

The setting controls and LED’s for the Y amplifiers, modes,
triggering and time base are located underneath the sector of the
front panel described above.

[6] Y-POS/CURS. I

– Control knob with two functions.

This knob allows position control of channel I trace or CUR-
SOR line(s). Briefly pressing the CURSOR POS pushbutton

[7]

selects the function. If the CURSOR line(s) are not

displayed the CURS. I function is not selectable.

Y-POS:

The

vertical trace position

of channel I can be set with this

control knob, if the CURSOR POS LED isn’t lit. In

addition

(“add”) mode both

Y-POS/CURS. I [6]

and

Y-POS/CURS. II

[8]

control knobs are active. If the instrument is set to

mode this control knob is

inactive

and the

X-POS. [12]

knob

must be used for horizontal positioning.

DC voltage measurement:

If no signal is applied at the

INPUT CH I [25]

, the vertical trace

position represents 0 Volt. This is the case if

INPUT CH I [25]

or in addition

(ADD)

mode, both

INPUT CH I [25]

and

INPUT

CH II [28]

, are set to

GND

(ground)

[26; 29]

and automatic

triggering

AT [9]

is present to make the trace visible.

The trace can then be set to the vertical position best suited
for the following

voltage measurement. After switching

GND

(ground) off and selecting

input coupling, a

signal applied at the input changes the trace position in
vertical direction. The

voltage then can be determined by

taking the deflection coefficient, the probe factor and the
trace position change with respect to the previous 0 Volt
position into account.

”0-Volt”-Symbol:

The READOUT indicates the “0-Volt” trace position of channel
I by a

”

⊥

⊥⊥

”

symbol to the left of the screen‘s vertical centre line

CHI

and

DUAL

mode. When Y position is used, this symbol

changes to an “arrow” symbol pointing outside the graticule
just before the trace goes outside the graticule limits.
If addition mode (“add”) is present just one ”

⊥

” symbol is

visible. In XY mode the “0-Volt” trace position for channel I (X)
and channel II (Y) is symbolised by “triangle” symbols at the
right graticule border (Y) and above the Y deflection coefficient
display. The “triangle” symbol(s) point(s) outside the graticule
when the “0-Volt” trace position is outside the graticule.

CURS.I:

The CURSOR lines marked by the symbol “I” can be shifted
by the

Y-POS/CURS. I

control knob, if the CURSOR POS

LED

[7]

lit.

TRACE ROT.

(trace rotation) is selected by pressing and

holding the pushbutton. This causes the display “Trace Rot.
with Int.” (trace rotation by use of INTENS/FOCUS knob) and
allows you to compensate the influence of the Earth’s
magnetic field on the trace deflection. To avoid misadjustment
due to unavoidable deflection non linearities, set the trace to
the graticule centre (Y-POS/CURS.I and X-POS. control).
After the trace has been set parallel to the horizontal graticule
line using INTENS/FOCUS, press “SAVE” to store the last
setting.
Further information can be found in section “First Time
Operation” under “Trace Rotation”.

[4] RM

The remote control mode can be switched on or off (”

”

LED dark) via the

RS-232

interface. When the

”RM”

LED is

lit, all electronically selectable controls on the front panel are
inactive. This state can be cancelled by depressing the

AUTO SET

pushbutton provided it was not deactivated via

the interface.

[5] SAVE / RECALL

– Pushbutton for instrument settings

The instrument contains 9 non volatile memories. These
can be used by the operator to save instrument settings and
to recall them.

SAVE:

Press and hold the RECALL/SAVE button to start a storage
process. This causes the SAVE menu (Standard menu, note
“B: Menu-Display and Operation”) to be displayed. Choose
the memory location cipher (highlighted) by pressing a
pushbutton underneath the triangle symbols. Briefly press
the pushbutton underneath “SET” to store the last instrument
setting and return from menu display to previous mode. If the
SAVE function was called inadvertently, it can be switched
off with “Esc”.
Switching the instrument off automatically stores the current
settings in memory location 9 (PWR OFF = Power Off), with
the effect that different settings previously stored in this
location get lost. To prevent this, RECALL 9 before switching
the instrument off.

RECALL:

Briefly pressing calls the RECALL menu. You can select the
required memory location using a “triangle” pushbutton.
Recall the previously stored instrument settings by briefly
pressing the “SET” pushbutton or briefly press “Esc” if the
function was called inadvertently.

Attention:
When an instrument setting is recalled, the current
signal may not be optimally displayed unless similar
(frequency, amplitude) to that used when the setting
was stored.

Controls and Readout

Y-POS / CURS.I

VOLTS / DIV.

CH I

CH II

DEL.MODE

Z-ON/OFF

Y-POS / CURS.II

LEVEL

X-POS.

CURSOR

POS