Hameg HM 1004-3 Series, Manual

Page: 20 / 36

Subject to change without notice
20
Controls and Readout
between different deflection coefficients. Consequently
the pushbutton is inactivated in combination with
∆
V
measurements.
1/
∆∆∆∆∆
t:
If the
∆
V function is not present, briefly pressing the
button selects between time and frequency measure-
ment which is not available in XY mode. The vertical
cursor lines and the measurement result apply to the
active timebase (A or B, resp. B in alternate timebase
mode).
In calibrated timebase condition the readout displays
“
∆∆∆∆∆
t:...” if time measurement is chosen. After switching
over to 1/
∆
t (frequency) “f:...” is displayed. If the timebase
is uncalibrated the readout displays “
∆∆∆∆∆
t>...” or “f<...” .
(37) TRK - CURSOR-Track function.
Briefly pressing simultaneously both buttons ON/OFF -
CHI/II - 1/
∆∆∆∆∆
t (36) and I/II -
∆∆∆∆∆
V/
∆∆∆∆∆
t (38) switches over from
single cursor line operation to track mode and vice versa.
In TRK (track) mode both cursor lines are indicated as
active (both dotted lines uninterrupted).
(38) I/II -
∆∆∆∆∆
V/
∆∆∆∆∆
t - Pushbutton with two functions.
I/II:
Briefly pressing this button changes the active (controlla-
ble) cursor in the sequence I - II - I, if TRK (track) mode is
not active. The active cursor is indicated by a continuously
dotted line. An interrupted dotted line indicates the
inactive cursor.
∆∆∆∆∆
V/
∆∆∆∆∆
t:
Pressing and holding this pushbutton changes from volt-
age to time (or frequency) measurement and vice versa.
In XY mode the instrument is automatically set to
∆
V.
∆∆∆∆∆
V:
Please note!
In all
∆∆∆∆∆
V (voltage) measurement conditions, the divi-
sion ratio of the probe(s) must be taken into account.
The voltage value displayed in the readout must be
multiplied by 100 if e.g. a x100 (100:1) probe is used. In
case of x10 (10:1) probes, the probe factor can be
automatically included (see item (28) and (32)).
item 1: Timebase mode.
(CH I or CH II single channel mode, DUAL and ADD)
In the voltage measurement condition, the cursors are
displayed as horizontal lines and the result is displayed in
the readout.
Single channel mode (channel I or channel II).
The
∆
V measuring result is automatically related to the
deflection coefficient of the active channel. The readout
displays
“
∆∆∆∆∆
V1...” or “
∆∆∆∆∆
V2...” .
Dual mode.
The CURSOR lines must be set on the channel I or
channel II signal. As the deflection coefficients may be
different, it will be required to select between the deflec-
tion coefficients of channel I and II.
Please note item (36)
CHI/II .
Addition (ADD) mode.
In ADD (addition) mode normally two input signals are
displayed as one signal (sum or difference). As the result
can only be determined if both (calibrated) deflection
coefficients are equal, the
CHI/II (36) selection function
is deactivated. In that case the readout indicates “
∆∆∆∆∆
V...”
without any additional channel information. Different
deflection coefficient settings or uncalibrated deflection
coefficient(s) are indicated in the readout as
“Y1<>Y2” .
item 2: XY mode.
In XY mode the instrument is automatically set to
∆∆∆∆∆
V
measurement. 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...” . The cursor lines are displayed as
vertical lines and the readout indicates “
∆∆∆∆∆
VX...” if the
channel II deflection coefficient is chosen.
∆∆∆∆∆
t:
In time or frequency measurement condition two vertical
cursor lines are displayed. The measurement result is
indicated as
“
∆∆∆∆∆
t...” (time measurement) or “f...” (fre-
quency measurement). Please note item (36) 1/
∆∆∆∆∆
t .
NOTE:
For frequency measurement, the distance between
the cursors must equal exactly one signal period.
In XY mode the timebase is switched off. Conse-
quently time or frequency measurement is disabled.
(39)CURSOR - Center biased lever.
The active cursor line (in track mode: both lines) can be
shifted in the required direction, until the graticule limits
are reached. The directions are marked on the front panel
and depend on the selected measurement (
∆
U,
∆
t or 1/
∆
t). Which of two shift speeds is used, depends on how
far the CURSOR knob is pressed. With slight knob
pressure the cursor line(s) moves slowly. If the knob is
pressed to the full extent the cursor moves fast. If the
knob is released it automatically reverts to the center
position and the cursor shift stops.
(40)CAL. - Pushbutton and concentric socket.
A squarewave signal of 0.2Vpp ±1% is available from the
socket for probe adjustment purposes. The signal fre-
quency depends on the pushbutton setting. If the
pushbutton is released it is approx. 1kHz and can be
switched over (depressed) to approx. 1MHz. The pulse
duty factor may deviate from 1:1 and the frequency is not
calibrated.
(41)CT - Pushbutton and banana jack.
Pressing the pushbutton switches the instrument over
from oscilloscope to component test mode and vice
versa.
In component test mode, all controls are deactivated with
the exception of the
CT button, AUTO SET (2) and
INTENS (4). All LEDs except “A” or “RO” (associated
with the INTENS knob) are dark. The readout displays only
“CT” in this condition.
One test lead is connected to the CT socket. The second