48
Subject to change without notice
5: Mathematics
Analysis of different characteristics of the measured values
OFF
The menu item 5:Math is off.
Lo Limit
Lower limit.
If the measured value is smaller than the Lo
Limit value an acoustic warning sounds and
“Lo
limit“ is displayed.
Hi Limit
Higher limit.
If the measured value is greater than Hi Limit
value an acoustic warning occurs and „Hi limit“
is
displayed.
Offset
An offset value can be set for all measurement
functions
to
a) Apply the offset value to the terminals.
b) Choose menu item 5:Math.
c) Select submenu „Offset“ by pressing
.
d) Open the submenu with MENU
, the
offset value applied will be displayed.
e) Accept the offset by pressing MENU
.
f) Return to measurement function, the display
shows 0,00…., , the dimension and „Os“.
g) Now you can connect the value to be
measured. It is compared the calibrated value
and the deviation is displayed.
In order to delete the stored offset:
a) Choose menu item 5:Math.
b) Select submenu „Off“ by pressing
.
c) Accept by pressing MENU
, return to
measurement function, the measured value is
displayed without offset.
or
d) select another measurement function.
The offset value will not be stored when the
measurement function is changed.
6:Logger
Analysis of different characteristics of the measured values
Start
The test series is started. According to the
selected sampling rate in „0:Time“ every xx
second a reading is taken and stored.
Stop
The test series is stopped.
Dump
The test series is shown on the display. Each
time button ENTER
is pressed the next value
of the stored test series is displayed.
7:COM
In this menu the baud rate can be chosen. Either 9600 baud or
19200 baud are available. The remaining interface parameters
cannot be changed.
M e a s u r e m e n t i n p u t s
Interface parameters (adjustable)
Rs Off
The interface is switched off
Rs19200 19,200 baud
Rs9600 9,600
baud
Interface parameters (not selectable)
N
no parity bit
8
8 data bits
1
1 stop bit
Xon-Xoff Xon-Xoff
STOP
Every transmission of a character takes 1 ms. Se-
lecting a sampling rate of 0.01 sec requires a baud
rate of 19 200.
8:Cal
This menu is saved by password. In order to guarantee exact
measurements the HM8112-3 is calibrated. Calibration may
only be done with adequate precision reference sources. For
this purpose the password can be orderd at HAMEG GmbH (Tel.:
06182-800-500 or via E-Mail: service@hameg. de).
Attention:
After receiving the password any warranty claims of HAMEG
GmbH concerning the compliance with the technical specifi -
cations of the instrument become void.
9:Mux
For the future implementation of a scanner/test point switch.
Measurement inputs
For connection measurement signals the HM8112-3 features
4 safety connectors on the front panel. Depending on the
measurement function chosen, the active terminals will be
illuminated.
STOP
The terminals on the front panel are safety connec-
tors and the regulations have to be observed.
If connecting dangerous voltages to the input termi-
nals
and
all relevant safety regulations are to
be observed.
DC voltage must be fl oating!
AC voltage must be fl oating by use of a safety isola-
ting transformer.
