Manualshelf

User manual

ManualsBrandsROHDE & SCHWARZ ManualsLaboratory Test EquipmentHM8123Frequency counters0 - 200 MHz
21222324252627282930
26
Subject to change without notice
M e n u
5.1 Store/Recall
This function allows storing or recalling of an instrument
conguration.TheHM8123isabletostore10congurations
(0 to 9). Use the keyboard 0 – 9
to select. After turn-on the
congurationstoredinmemory0willberecalledautomatically.
5.2 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
. If this fre-
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.
STORE / RECALL
REFERENCE
CONTRAST
MENUS:
>
RECALL:
TOGGLE FREQUENCY REFERENCE
REFERENCE : INTERNAL
TOGGLE FREQUENCY REFERENCE
REFERENCE : EXTERNAL
Adjust LCD Contrast
-------------
*
--------------
RPM SETTINGS
DISPLAY
CALIBRATE
MENUS:
>
CALIBRATE
BEEPER
ABOUT
MENUS:
>
ON
OFF
Beeper:
>
Frequency
Level A
Level B
Calibrate:
>
 
STORE / RECALL
REFERENCE
CONTRAST
MENUS:
>
RECALL:
TOGGLE FREQUENCY REFERENCE
REFERENCE : INTERNAL
TOGGLE FREQUENCY REFERENCE
REFERENCE : EXTERNAL
Adjust LCD Contrast
-------------
*
--------------
RPM SETTINGS
DISPLAY
CALIBRATE
MENUS:
>
CALIBRATE
BEEPER
ABOUT
MENUS:
>
ON
OFF
Beeper:
>
Frequency
Level A
Level B
Calibrate:
>
5.3 Contrast
In this submenu the contrast of the LCD display may be set using
the arrow keys  
or the knob . If the contrast adjusted
isconrmedbypressingpushbuttonENTER
this setting will
be stored in a non-volatile memory. If the menu is left without
conrmationthesettingofthecontrastwithENTER
, this
setting will be lost afetr power-off. After turn-on the HM8123
will recall the value stored in the non-volatile memory.
5.4 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
or the
4 arrow keys   
.
5.5 Display
In this submenu the display may be turned off or on.
RPM : Pulses Per Revolution
500
Reset instrument in factory settings ?
Calibration data not modified
HAMEG Instruments HM8123 Universal Counter
Software version ......
Calibrated on : ......
TOGGLE DISPLAY ON/OFF
Display is : OFF
TOGGLE DISPLAY ON/OFF
Display is : ON
Gate Time : 500 ms
10.0000000 MHz
Ref: INT
Level A : +0.500 V
10.0000000 MHz
Ref: INT
 
RPM : Pulses Per Revolution
500
Reset instrument in factory settings ?
Calibration data not modified
HAMEG Instruments HM8123 Universal Counter
Software version ......
Calibrated on : ......
TOGGLE DISPLAY ON/OFF
Display is : OFF
TOGGLE DISPLAY ON/OFF
Display is : ON
Gate Time : 500 ms
10.0000000 MHz
Ref: INT
Level A : +0.500 V
10.0000000 MHz
Ref: INT
5.6 Calibrate
It is possible to recalibrate the reference frequency (Frequency)
and the trigger levels of channels A (LEVEL A) and B (LEVEL
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
specications will be voided.
5.7 Beeper
In this submenu the beeper can be activated/deactivated. If the
instrumentcongurationisstoredusingtheStorefunction(see
chapter Store/Recall), the setting of the beeper is also stored.
5.8 About
After selection of this submenu the type of instrument and the
software version will be displayed.
6 Additional inputs and outputs
6.1 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
or by a signal
at the TRIG/ARM input
.
The TRIG/ARM input connector
is located on the front panel.
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
ful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 Measurement time