Hameg HM 2005 Manual Download Page 18

Page: 18 / 36

Subject to change without notice

and slope can be set independently using the same controls
used for the A time base trigger setting. The trigger point is
indicated again but has the added letter B in the readout.

In delay trigger mode, the delay time must first elapse. Then
the next suitable signal slope (direction and height) starts
the B time base. If those basic requirements are not met,
there will be no B trace visible. Under the condition that the
signal contains several suitable slopes after the delay time,
it can be seen in alternate time base mode that the delay
time setting (DEL. POS.) now causes the intensified sector
to jump from one slope to another. If there is no slope after
the delay time, the B time base will not be triggered.

VAR.:

Pressing and holding the

DEL.TRIG. - VAR.

pushbutton

selects the

TIME/DIV. (25)

control knob function between

time base switch and vernier (variable). The current setting
is displayed by the VAR-LED located above the knob.
The variable function can be activated for the A time base or
the B time base, the settings are stored separately. As
alternate time base mode is a B time base sub mode, only
the B time base is affected in this condition.

A Time Base.

After switching the

VAR-LED

on, the time deflection

coefficient is still calibrated until further adjustments are
made. Turning the

TIME/DIV. (25)

control knob counter

clockwise increases the time deflection coefficient (reduces
the deflection speed) and the deflection coefficient becomes
uncalibrated. Instead of e.g. “A:10µs”, the readout then
displays

“A>10µs”

indicating the uncalibrated condition. This

setting is stored if the instrument is switched to alternate (A
and B) or B time base mode.
Pressing and holding the

DEL.TRIG. - VAR.

pushbutton again

in A time base mode switches the LED off, the time base
switch function on, and sets the time deflection coefficient
back into the calibrated condition.

B and Alternate Time base.

In alternate (A and B) as well as in B time base mode, pressing
and holding the

DEL.TRIG. - VAR.

pushbutton selects the

TIME/DIV.

knob function between B time base switch and

B vernier (VAR -LED on). In the latter case the

TIME/DIV.

knob can be used in the same way as described before under
A time base condition.

Underneath the front panel sector described above, the BNC
sockets and four pushbuttons are located.

(28)INPUT CH I

– BNC socket.

This BNC socket is the signal input for channel I. In XY mode,
signals at this input are used for the X deflection. The outer
(ground) connection is galvanically connected to the
instrument ground and consequently to the safety earth
contact of the line/mains plug.

(29) AC / DC

– Pushbutton with two functions.

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 indicated
deflection coefficient of channel I 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”, Y1...). 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.

(30) 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)

(input coupling)

symbol.

The GD setting disables the input signal, the

AC/DC (29)

pushbutton and the

VOLTS/DIV (17)

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. I (9)

INV.:

Pressing and holding this pushbutton switches the channel I
invert function on or off. The invert

“on”

condition is indicated

by the readout with a horizontal bar above

“Y1”

(Yt mode).

The invert function causes the signal display of channel I to
be inverted by 180°. In XY mode the invert function is not
available.

(31) Ground socket

– 4mm banana socket galvanically

connected to safety earth.
This socket can be used as reference potential connection
for

and low frequency signal measurement purposes and

COMPONENT TEST

mode.

(32) INPUT CH II

– BNC socket.

This BNC socket is the signal input for channel II. In XY mode,
signals at this input are used for the Y deflection. The outer
(ground) connection is galvanically connected to the
instrument ground and consequently to the safety earth
contact of the line/mains plug.

(33) AC / DC

– Pushbutton with two functions.

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.

Controls and Readout

MADE IN GERMANY

INV.

INPUT CH I (HOR. INP.(X))

AC/DC