Additional Inputs And Outputs; External Arming - Hameg HM8123 Manuel

M e n u
Store/Recall
This function allows storing or recalling of an instrument con-
fi guration. The HM8123 is able to store 10 confi gurations (0 to
9). Use the keyboard 0 – 9
guration stored in memory 0 will be recalled automatically.
Reference
In this submenu the internal or an external reference may be
selected. If an external reference was chosen the HM8123 will
check the signal at the BNC connector 10 MHz
quency is not accurate enough or if there is no signal, in both
cases the error message „External Reference Test failed" will
be displayed. In this case the instrument will continue to use
its own reference. The error message will also be shown and
return to the internal standard performed if an external refe-
rence frequency deviates more than 2 Hz.
TOGGLE FREQUENCY REFERENCE
REFERENCE : INTERNAL
Contrast
In this submenu the contrast of the LCD display may be set using
the arrow keys or the knob
is confi rmed by pressing pushbutton ENTER
be stored in a non-volatile memory. If the menu is left without
confi rmation the setting of the contrast with ENTER
setting will be lost afetr power-off. After turn-on the HM8123
will recall the value stored in the non-volatile memory.
Adjust LCD Contrast
------------- * --------------
RPM settings
This menu item allows to select the number of pulses per
revolution. This parameter is required for rpm measurements
and may be selected from 1 to 65,535 using the knob
4 arrow keys .
RPM : Pulses Per Revolution
500
Display
In this submenu the display may be turned off or on.
TOGGLE DISPLAY ON/OFF
Display is : ON
Calibrate
It is possible to recalibrate the reference frequency (Frequency)
and the trigger levels of channels A (LEVEL A) and B (LEVEL
26
Subject to change without notice
to select. After turn-on the confi -
. If this fre-
TOGGLE FREQUENCY REFERENCE
REFERENCE : EXTERNAL
. If the contrast adjusted
this setting will
, this
or the
TOGGLE DISPLAY ON/OFF
Display is : OFF
B). For this porpuse the calibration procedure can be ordered
at Hameg Instruments GmbH (Phone: +49 6182 - 800 500 or
E-Mail: service@hameg.de – serial number required).
We recommend that recalibrations should only
be performed by Hameg Instruments GmbH or an
authorized calibration lab. After receiving the cali-
bration procedure the warranty with respect to the
specifi cations will be voided.
STOP
Beeper
In this submenu the beeper can be activated/deactivated. If the
instrument confi guration is stored using the Store function (see
chapter Store/Recall), the setting of the beeper is also stored.
About
After selection of this submenu the type of instrument and the
software version will be displayed.
HAMEG Instruments HM8123 Universal Counter
Software version ......
Calibrated on : ......

Additional inputs and outputs

External Arming

External arming prevents triggering of a measurement by
undesired signals. The ARMED mode is selected by pressing
ARMED , the pushbutton will light up. A measurement can
be started either manually by pressing TRIG
at the TRIG/ARM input .
The TRIG/ARM input connector
As long as there is a low level input signal the counter will not
start a new measurement. A measurement will be started if
the following conditions are all met: the signal at the input
switches from low to high, the trigger conditions selected are
fulfi lled. The delay time caused by the arming signal is 50 ns.
The measurement will be performed according to the HM8123
settings. During a measurement any signals at the TRIG/ARM
input will be ignored. A new measurement will be started
after the measurement time set has elapsed with the next
positive slope at the TRIG/ARM input
Arming
Signal
Input A
Number of
periods counted
or by a signal
is located on the front panel.
.
Measurement time