44
Mathematical Functions
6 Mathematical
Functions
In addition to the basic functions of the
multimeter, mathematical functions are also
available. These can be accessed by pres-
sing the MEAS key on the front panel of the
instrument.
Tab. 6.1 describes which mathematical functions can be
used with which measurement functions.
6.1 Statistic
The soft menu STATS allows the user to activate the stati-
stic functions (Min/Max, Mean, StdDev, Pk to Pk, Count).
Use the soft menu key STATS to activate (On) or deactivate
(Off) statistic values. The statistic functions will be dis-
played below the main measurement value (Main). You can
use the soft menu key #MEAS. to determine how many
measurement values are to be included in the statistic. You
can select the number of measurement values via knob
or via numeric keypad (SHIFT key). The statistic may be
performed on a maximum of 50,000 measurement values.
If #MEAS is set to „0“, the statistic will be performed on all
measurement values. If #MEAS is set to „7“, for instance,
the statistic will be performed on 7 measurement values.
The soft menu key RESET resets the statistic. Additionally,
the soft menu AUTO REST is available. If the Auto Reset
function is activated (ON), the statistic measurement points
(Count) will be not reset in Auto Range mode.
6.2 Measuring
Limits (Limits)
The soft menu LIMIT allows you to select the HIGH LIMIT
and LOW LIMIT for a measurement. Based on these li-
mits, a test can be evaluated as passed or not passed. The
Measurement
function
Mathematic
functions
Stats
Limits
HOLD
NULL
DC V
●
●
●
●
AC V
●
●
●
●
DC I
●
●
●
●
AC I
●
●
●
●
Ω
●
●
●
●
CAP
●
●
●
●
SENSOR
●
−
●
●
−
−
−
−
Tab. 6.1: Measurement functions with possible math options
If the instrument shows OVER RANGE on the display, the statistic
measurement values can be not captured. This values will be dis-
played as INVALID COUNT in red.
limits can be activated (ON) or deactivated (OFF) via soft
menu key LIMITS. The limits will be displayed below the
main measurement value (Main). If a value falls below or
exceeds the limits during a test, it will be reflected by the
color display of the measurement value. If the limits are ob-
served, the measurement value is displayed in green. If the
value falls below or exceeds the set limits, the limit value
will be displayed in red. In addition, you can activate (ON)
or deactivate (OFF) an error tone (soft menu key BEEPER)
which will sound when the value exceeds or falls below the
set limits.
6.3 Recording Data (Logging)
The soft menu LOGGING allows you to start the capture
of measurement values and to select various settings. Use
the soft menu key LOGGING to activate (ON) or deactivate
(Off) the capture and the storage of measurement values.
Use the soft menu Storage to select the storage location
(Internal/USB stick), the file name (File Name) and the file
format (CSV/TXT). The soft menu key Interval and the knob
allow you to select a measurement interval. The measu-
rement interval describes the time between the recorded
measurements. For instance, if the function Interval is set
to 2, all 2s will be included in the measurements.
The soft menu MODE offers three different logging mo-
des. Select the function U if you intend to perform an
infinite data capture. The limiting factor in this context
is the size of the internal storage (maximum of 50,000
measurement points) or of the connected USB stick (4 GB
max., FAT/FAT32 formatted). If the function N is activated,
the soft menu key Count and the knob enable you to set
the number of measurement values to be captured. For
instance, if you set an INTERVAL of 2 s and a COUNT of 5,
5 measurement values will be captured in intervals of 2 s.
Depending on which settings for the time interval and the number
of measurement values to be captured have been confirmed in the
logging menu, these settings will be synchronized with the trigger
menu (see chapter Instrument Functions).
Fig. 6.1: Logging menu setting
External USB hard disc drives will be not supported. Only FAT/
FAT32 formatted USB sticks can be used with the ¸HMC8012.
