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TOGGLE DISPLAY ON/OFF
Display is : ON
TOTAL A
Event (pulses, periods) measurement of the channel A signal.
If the input signal disappears or if the pushbutton HOLD
TOGGLE DISPLAY ON/OFF
depressed the measurement will be stopped and the result
frozen. By pressing the RESET
Display is : OFF
level on the RESET connector
new measurement will be started after the pusbutton
released or after the RESET signal
Reset instrument in factory settings ?
4.3
Gate time
Calibration data not modified
The counter HM8123 totalizes the input cycles until the gate
time set has eclapsed and the trigger conditions selected are
fulfilled. Thus the effective measuring time can be longer than
the gate time set. The measuring time cannot be smaller than
HAMEG Instruments HM8123 Universal Counter
one period of the signal.
Software version ......
Calibrated on : ......
The gate time can be varied between 1 ms and 65.5 s. Operate
pushbutton GATE TIME
and enter the desired gate time by
using the 4 arrow keys
numerical keys
and the unit buttons (ms
Level A : +0.500 V
a measurement the GATE LED
selected, the HM8123 inserts a wait time between the mea-
10.0000000 MHz
surements to simplify the reading of the display. In this case a
complete measuring cycle will take at least 180 ms. The wait
time can be deactivated by sending WT0 via the interface. To
activate the wait time WT1 has to be sent.
Gate Time : 500 ms
10.0000000 MHz
4.4
Triggering
RPM : Pulses Per Revolution
500
When using the channels A
or B
gering may be selected. The triggering of channel C
is not selectable, signals between 50 mV and a maximum of 5 V
will be automatically triggered.
TOGGLE DISPLAY ON/OFF
Automatic triggering
Display is : ON
Pressing the AUTO TRIG pushbutton
triggering, the pushbutton will light up. Please note that AC
coupling is mandatory, the pushbutton DC
In this mode the amplitude of the signal is measured, and the
trigger level is set to 50 % of it.
TOGGLE DISPLAY ON/OFF
Display is : OFF
Manual Triggering
If the AUTO TRIG pushbutton
is active. The trigger level has now to be selected manually.
Operate pushbutton LEVEL A
Reset instrument in factory settings ?
desired trigger level by using the 4 arrow keys
the knob
or with the numerical keys
Calibration data not modified
(mV
, V
).
The trigger level may be selected in 3 ranges:
Pushbutton
Pushbutton
HAMEG Instruments HM8123 Universal Counter
1:10
1:10
Software version ......
off
off
on
off
Calibrated on : ......
off
on
on
on
Level A : +0.500 V
10.0000000 MHz
Gate Time : 500 ms
All manuals and user guides at all-guides.com
is
pushbutton or by a high
the display will be reset. A
was
switched to low.
and the knob
or with the
, s
). During
is lit. If a short gate time is
Ref: INT
Ref: INT
manual or automatic trig-
signals
will activate automatic
have to be dark.
is dark, manual triggering
or LEVEL B
and enter the
and
and the unit buttons
Triggerlevel
–2,000 V .... + 2,000 V
–20,00 V .... + 20,00 V
–20,00 V .... + 20,00 V
–200,0 V .... + 200,0 V
Ref: INT
Optimum triggering is obtained by setting the trigger level to
about 50 % of the peak-to-peak amplitude of the input signal. In
manual mode proper triggering can be checked by the trigger
indicators
and
control of channels A
LED on continuously:
Input signal above the trigger
level selected.
LED off continuously:
Input signal below the trigger
level selected.
LED blinking:
Correct setting.
LED on
LED blinking
Suitable setting of the attenuators
for correct measurements. With too much attenuation the
residual noise of the input signal comparator will affect the
result. With too little attenuation or if the input signal is too
large the input stage may be overdriven which lead to erroneous
measurements.
With all frequency measurements AC coupling should be used
(below appr. 10 Hz DC coupling will be necessary) together with
as much attenuation as possible. Period measurements should
use DC coupling (pushbutton DC
If the input signal comes from a 50 Ω system the input impedance
of the HM8123 have to be set to 50 Ω (pusbutton 50 Ω
M e n ü
Menü
5 Menu
Das Menü wird durch Drücken der Taste SELECT
The menu is called by pressing the pushbutton SELECT
Mit den Tasten ��
oder dem Drehgeber
menus are called from the main menu by using the rotating knob
menü ein Untermenü ausgewählt werden. Das ausgewählte
or the 2 arrow keys . The submenu selected will be
Untermenü wird mit einem Pfeil > gekennzeichnet. Durch
identified by an arrow >. The submenu selected will be opened
Betätigen der Taste ENTER
by pressing ENTER
. Parameters are changed by using the 4
geöffnet. Das Eingeben der Parameter im jeweiligen Untermenü
arrow keys or the knob
erfolgt durch die Tasten �� � �
enter the value. Pressing ESC
. Mit der Taste ENTER
wird ein eingegebener Wert bestätigt.
main menu. The main menu will be left by pressing SELECT.
Um zum Hauptmenü zurückzukehren, ist die Taste ESC
drücken. Das Menü wird mit SELECT
STORE / RECALL
REFERENCE
MENU:
CONTRAST
>
RPM SETTINGS
DISPLAY
CALIBRATE
BEEPER
ABOUT
Store/Recall
Subject to change without notice
Diese Funktion ermöglicht das Speichern (Store) bzw. Aufrufen
M e n u
and B
as follows:
LED off
0V
and
is a prerequisite
lighted) if at all possible.
lighted).
aufgerufen.
. Sub-
kann im Haupt-
wird das gewählte Untermenü
. Pressing ENTER
will
und durch den Drehgeber
will return the control to the
zu
wieder verlassen.
25
fl üchtigen
vorher die
zu bestätig
HM8123 ve
nichtfl üch
RPM set
In diesem
eingestell
benötigt. E
werden. D
und dem D
500
Display
In diesem
deaktivier
TO
Display is : O
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