Hameg HM504-2, Manual

Page: 24 / 42

Subject to change without notice
22
Gain (display “gain: measured value, unit”)
Ratio measurement of signal voltages by the aid of two long
and two short CURSOR lines; enabled only in Yt (time base)
mode.
Briefly pressing the UNIT-pushbutton
[35] selects ratio
(unnamed), % or dB.
The application of Gain measurement depends whether one
or two signals are displayed.
1th: One signal (CH I, CH II or “add” mode).
A measurement can be made on one signal before and after
a signal frequency change.
The distance between the long CURSOR lines serves as the
reference value. The measured value is calculated from the
distance between the short CURSOR lines compared to the
reference value.
This method is suitable to determine e.g. the oscilloscope‘s
frequency response.
2nd: DUAL mode.
Enables two port measurements (amplifier, attenuator) by
determination of the ratio of input and output voltages. For
correct measuring results you must determine which channel
is applied to the input and output ports respectively.
Both long CURSOR lines must be placed on the channel I
signal while the short CURSOR lines must be set on the
channel II signal.
Briefly pressing the SOURCE pushbutton calls a menu which
offers “g1
→
2:“ and “g2
→
1:“. The selection of the required
setting can then be made by briefly pressing the SOURCE
pushbutton until the setting is highlighted. If channel I is
connected to the input and channel II the output of the two
ports, “g1
→
2:“ must be chosen. Conversely if the channels
are reversed choose “g2
→
1:“.
SET
Pressing and holding SET in condition CURSOR supported
voltage measurement, causes an automatic signal related
CURSOR line setting within certain limits. As it is the trigger
signal that is measured, (trigger source CH I or CH II) the
trigger coupling affects the measuring result. Without a
signal or with an untriggered signal, the CURSOR lines do not
change. SET is activated on condition that:
1. The CURSOR lines are visible.
2. A CURSOR MEASURE menu function must have been
chosen which causes the display of horizontal CURSOR
lines (Rise Time,
∆
V, V to GND, Ratio Y and Gain).
3. CH I, CH II or DUAL mode is activated.
[33] SOURCE GLUE – Pushbutton with double function.
SOURCE
Briefly pressing selects the source (channel) the measurement
display refers too. Consequently this function is inactive
during one channel operation (CH I, CH II or “add“ mode).
a) If DUAL or XY mode is present in combination with
CURSOR voltage measurement (CURSOR MEASURE:
“
∆
V“ and “V to GND“) two long CURSOR lines are
displayed. Briefly pressing SOURCE selects the channel
and it`s deflection coefficient for the measurement. The
CURSOR lines must be set to the signal according to the
selected channel.
b) DUAL mode in combination with “Gain“ (two port)
measurement allows you to determine the input and
output voltage ratio with two long and two short CURSOR
lines being visible. A correct measurement requires the
input of the conditions which channel is connected to the
input and output respectively.
GLUE
Pressing and holding switches this function on or off, which
is indicated by the way the CURSOR lines are displayed. In
GLUE on condition the number of dots from which CURSOR
lines and “+” symbols consist is reduced.
GLUE combines the CURSOR lines and “+” symbol position
with the Y and X position controls. Y and X position changes
then affect both the signal and the CURSOR lines and “+”
symbols.
[34] SELECT ON OFF – Pushbutton with double function.
ON OFF
Pressing and holding switches the CURSOR lines on or off.
When the CURSOR lines are activated, the READOUT displays
the last activated measuring function of the CURSOR
MEASURE menu. Briefly pressing MEASURE
[32] opens this
menu.
Switching the CURSOR lines off additionally switches over
to last used AUTO MEASURE function. Briefly pressing
MEASURE
[32] opens this menu.
SELECT
If the CURSOR lines are visible (CURSOR MEASURE) and
the CURSOR POS function
[7] is active, the symbols “I” and
“II” are assigned to CURSOR lines or “+” symbols. The “I”
and “II” symbols indicate by which Y-POS/CURS. (I or II)
control the CURSOR line(s) position can be changed. Briefly
pressing the SELECT pushbutton changes the assignment.
Only the CURSOR lines and “+” symbols which are assigned
can be shifted. Tracking mode is present when two CURSOR
line or “+”symbols have the same assignment; i.e. they are
shifted simultaneously by the same control.
[35] UNIT CAL. SEL – Pushbutton with double function.
UNIT
Briefly pressing changes the unit of the displayed measuring
value. If CURSOR MEASURE is active (CURSOR lines visib-
le) and more then two units are selectable, a menu opens;
otherwise the switch over appears directly without a menu.
On condition AUTO MEASURE the UNIT function selects
between frequency and period or PEAK+ and PEAK–.
CAL. SEL.
Pressing and holding opens the CAL. FREQUENCY menu,
which offers DC and AC (1Hz to 1MHz) voltage signals. In
setting “dependent on TB” the output signal frequency
depends on the time coefficient setting TIME/DIV.
[22].
The “0.2V
pp
” [36] marked socket serves as an output for the
selected signal.
Controls and Readout
CT
GLUE SET
ON
OFF
CAL.
SEL.
UNIT 0.2 Vpp SELECT SOURCE
C U R S O R
MEASURE MAIN MENU
READ
OUT
37 36
37
35 34 33 32 31