Gate Time; Triggering; Menu - Hameg Instruments HM 8123 Manual Del Usario

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
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
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
or B manual or automatic trig-
signals
will activate automatic
have to be dark.
is dark, manual triggering
or LEVEL B and enter the
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
is manual mode proper triggering can be checked by the trigger
indicators and
LED on continuously:
LED off continuously:
LED blinking:
LED on
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

5 Menu

Das Menü wird durch Drücken der Taste SELECT
The menu is called by pressing the pushbutton SELECT
Mit den Tasten ��
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
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
main menu. The main menu will be left by pressing SELECT.
Um zum Hauptmenü zurückzukehren, ist die Taste ESC
and
drücken. Das Menü wird mit SELECT
MENU:
Store/Recall
Diese Funktion ermöglicht das Speichern (Store) bzw. Aufrufen
M e n u
control of channels A and B
Input signal above the trigger
level selected.
Input signal below the trigger
level selected.
Correct setting.
LED off
LED blinking
and is a prerequisite
lighted) if at all possible.
Menü
oder dem Drehgeber kann im Haupt-
wird das gewählte Untermenü
. Parameters are changed by using the 4
. Pressing ENTER
und durch den Drehgeber
will return the control to the
wird ein eingegebener Wert bestätigt.
wieder verlassen.
STORE / RECALL
REFERENCE
CONTRAST
RPM SETTINGS
>
DISPLAY
CALIBRATE
BEEPER
ABOUT
Subject to change without notice
as follows:
0V
lighted).
fl üc
vor
zu
HM
nic
aufgerufen.
. Sub-
will
RP
zu In d
ein
ben
we
und
5
Dis
In
dea
25