Manual

Gossen Metrawatt GmbH 19
1
Reactivation results from falling short of specified measured value limits.
2
Two acoustic signals are generated the first time a measured value is saved as a
reference value. For subsequent data hold, two acoustic signals are only generated if
the currently frozen value deviates from the first saved value by less than 100 digits.
Key: MV = measured value, MR = measuring range
Example
The voltage measuring range is set manually to 30 V.
The first measured value is 5 V and is stored to memory because
it’s greater than 10% of the measuring range (= 3 V), and is thus
reliably above the background noise level. As soon as the mea-
sured value drops to less than 10% of the measuring range, i.e.
amounts to less than 3 V which corresponds to removal of the
test probes from the measuring point, the instrument is ready to
store a new value.
7.5.1 Saving Minimum and Maximum Values – “MinMax”
General
Minimum and maximum measured values applied to the measur-
ing instrument’s input after the MinMax function has been acti-
vated can be “frozen” at the display.
Applications
The most important use of this function is the determination of
minimum and maximum values during long-term measured value
observation. The MinMax function can be activated in all measur-
ing functions. This is possible for the following functions after
measurement has been started: RISO, R
LO
/2L and R
LO
/4L.
The MinMax function has no effect on the analog display, at which
the current measured value continues to appear.
Procedure
Apply the measured quantity to the instrument and set the mea-
suring range with the Man / Auto softkey before activating the Min-
Max function with the Data / MinMax softkey. Man appears at the
display with a green background. After activating the MinMax
function with the corresponding softkey, Man is grayed out and
cannot be changed until MinMax is pressed again for deactivation.
MinMax appears at the display with a green background. If auto-
matic measuring range selection was active prior to activation of
the MinMax function, switching to manual measuring range selec-
tion is also disabled as long as the MinMax function is active.
Both Min and Max, as well as the associated values, are displayed
between the digital and analog displays along with the time of
their occurrence.
The MinMax function is deactivated by briefly pressing the Data /
MinMax softkey, when the measuring function is changed or when
the instrument is switched off and back on again.
Note
As opposed to the Data function, the MinMax function can
also be used for temperature measurement.
The MinMax function is reset by pressing the ESC key.
After pressing Data / MinMax once again, the minimum and maxi-
mum values are displayed together with the average value
(“Avg.”). The Min Avg Max display appears without timestamp.
Function
Data
Key
Data /
MinMax
Condition Response from Instrument
Measuring
Function
Measuring
Signal
Display
Acous-
tic
Data + MV
Activate short
is
displayed
1 x
Save
(stabilized
measured
value)
V, A, F, Hz,
%
> 10%
MR
is
displayed
1 x
2 x
2

0L
Reactivate
1
V, A, F, Hz,
%
< 10%
MR
stored MV

= 0L
Change to
MinMax
short
is
cleared
1 x
Function
MinMax
Key
Data /
MinMax
Min. and Max.
Measured Values
Response from Instrument
Display
Acoust
ic Sig-
nal
Min + MV
Max + MV
Activate
and save
short are saved
momentary
measured value
1 x
Save and
display
Storage continues in
background, new min. and
max. values are displayed.
stored min. value 1 x
stored max. value 1 x
Stop short are deleted is cleared 1 x