Hameg HM 2005 Manual Download Page 13

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Subject to change without notice

Consequently this function is only available in alternate time
base mode. After the TRS pushbutton was pressed once the
LED related to that pushbutton is lit.

The

Y-POS. I (9)

control knob is then operative as vertical

position control for the trace of the B time base. The
maximum position shift is approx. +/- 4 div. Without a change
of the

Y-POS. I (9)

control the trace separation function is

switched off automatically after approx. 10 seconds. The trace
separation function can also be left by pressing the TRS
pushbutton.

(9) Y-POS. I

– Control knob with a double function.

Y-Position channel I:

The vertical trace position of channel I can be set with this
control knob. In ADD (addition) mode both (Y-POS. I and Y-
POS. II) control knobs are active.

Y-Position B-trace in alternate time base mode:

In alternate time base mode, this control knob can be used
to separate the B time base trace from the A time base trace.

Please note TRS (8)

DC voltage measurement:

If no signal is applied at the INPUT CHI (28), the vertical trace
position represents 0 Volt. This is the case if INPUT CHI (28)
or in addition (ADD) mode, both INPUT CHI (28) and INPUT
CHII (32), are set to GD (ground) and automatic triggering
(AT (12)) is present to make the trace visible. The trace then
can be set to vertical position which is suited for the following
DC voltage measurement.

After switching GD (ground) off and selecting DC input
coupling, a DC signal applied at the input changes the trace
position in vertical direction. The DC voltage then can be
determined by taking the deflection coefficient, the probe
factor and the trace position change in respect to the previous
0 Volt position into account.

”0 Volt” Symbol:

The determination of the ”0 Volt” position is not necessary
if the readout is switched on and the software setting ”DC
REFERENCE = ON” is selected in the ”SETUP” submenu
”Miscellaneous”. Then the ”

⊥

⊥⊥

” symbol to the left of the

screen‘s vertical center line always indicates the ”0 Volt”
trace position in CHI and DUAL mode.

The ”0 Volt” position symbol (

⊥

⊥⊥

) will not be displayed in XY

and ADD (addition) mode.

(10) BW Limit

– Pushbutton with associated

BWL

-LED.

Pressing this pushbutton switches the

BWL

–LED and readout

display on or off. The amplifier(s) bandwidth will be reduced
if deflection coefficients from 5mV/div. to 5V/div. are present
and BWL (Bandwidth Limit) is active. The bandwidth reduction
causes less amplifier noise and therefore increases the trace
sharpness.
On 1mV/div. and 2mV/div. deflection coefficient settings, the
bandwidth is already reduced for the benefit of higher input
sensitivity. The BWL function is practically ineffective in this
settings.

(11) Y-POS. II

– Control knob.

The vertical trace position of channel II can be set with this
control knob. In ADD (addition) mode both (Y-POS. I and Y-
POS. II) control knobs are active. If the instrument is set to
XY mode this control knob is inactive and the X-POS. knob
must be used for a horizontal position shift.

DC voltage measurement:

If no signal is applied at the INPUT CHII (32), the vertical
trace position represents 0 Volt. This is the case if INPUT
CHII (32) or in addition (ADD) mode, both INPUT CHI (28)
and INPUT CHII (32), are set to GD (ground) and automatic
triggering (AT (12)) is present to make the trace visible. The
trace then can be set to vertical position which is suited for
the following DC voltage measurement.

”0 Volt” Symbol:

The determination of the ”0 Volt” position is not necessary
if the readout is switched on and the software setting ”DC
REFERENCE. = ON” is selected in the ”SETUP” submenu
”Miscellaneous”. Then the ”

⊥

⊥⊥

” symbol to the left of the

screen‘s vertical center line always indicates the ”0 Volt”
trace position in CHI and DUAL mode.

The ”0 Volt” position symbol (

⊥

⊥⊥

) will not be displayed in XY

and ADD (addition) mode.

(12) NM - AT -

(SLOPE)

Pushbutton with a double function and associated NM-LED.

NM - AT selection:

Press and hold the pushbutton to switch over from automatic
(peak value) to normal triggering (NM LED above the
pushbutton lit) and vice versa. If the LED is dark, automatic
(peak value) triggering is selected. Whether the peak value
detection in automatic trigger mode is automatically activated
or not, depends on the trigger coupling setting (TRIG. MODE).
The way the trigger point symbol in the readout responds on
different LEVEL control knob settings indicates the situation:

1. If the trigger symbol can not be shifted in the vertical

direction when a signal is not applied or the signal height
is not sufficient, the peak value detection is active.

2. Under the condition that the trigger point symbol cannot

be shifted in such a way that it leaves the signal display
on the screen, the peak value detection is active.

Controls and Readout

MADE IN GERMANY

A/ALT.

DEL.TRIG

TRS

PUSH
BOTH

PUSH
LONG

VAR.