Manual

18 Gossen Metrawatt GmbH
7.4 Display (TFT)
7.4.1 Digital Display
Measured Value, Unit of Measure, Type of Current, Polarity
The measured value with correct decimal and plus or minus sign
appears at the digital display. The selected unit of measure and
current type are displayed as well. A minus sign appears to the
left of the value during the measurement of zero-frequency quan-
tities, if the plus pole of the measured quantity is applied to the
“” input.
The Display Zeros parameter can be used to determine whether
leading zeros will appear or be suppressed at the measured value
display (see section 6.6).
Exceeded Measuring Range
If the upper range limit of 1000 digits is exceeded, “OL” (overload)
appears at the display.
Exceptions: “OL” appears at the display as of 1030.0 V in the
case of voltage measurement in the 1000 V range, as of 4.500 V
for diode testing and as of 1.100 A in the 1 A range.
7.4.2 Analog Display
Measured Value, Polarity
The analog display emulates the dynamic performance of a mov-
ing-coil mechanism. This display is especially advantageous for
observing measured value fluctuation, and for balancing proce-
dures.
Display as a horizontal (green) bar which indicates the momentary
measured value in real-time.
The analog scale displays a small negative range for the measure-
ment of zero-frequency quantities with positive measured values,
allowing for precise observation of measured value fluctuation
around zero. If the measured value exceeds a certain negative
range, polarity is reversed at the analog display.
The analog scale displays a small positive range for the measure-
ment of zero-frequency quantities with negative measured value,
allowing for precise observation of measured value fluctuation
around zero in this case as well.
Scaling of the analog scale is automatic. This is very helpful for
manual measuring range selection.
Exceeded Measuring Range
Exceeding the measuring range is indicated exclusively via the
digital display.
Refresh Rate
The analog display is refreshed 40 times per second.
7.5 Measured Value Storage – Data Function
(Auto-hold/Compare)
General
An individual measured value can be automatically “frozen” with
the DATA function (auto-hold).
Applications
This function is useful, for example, when contacting the measur-
ing points with the test probes requires your full attention. After
the measuring signal has been applied and the measured value
has settled in in accordance with the “condition” listed in the table
below, the measured value is frozen at the digital display and an
acoustic signal is generated. The test probes can now be
removed from the measuring points and the measured value can
be read from the digital display. If the measuring signal falls below
the value specified in the table, the function is reactivated for stor-
age of the next value.
The Data function can be activated in all measuring functions. This
is possible for the following functions after measurement has
been started: RISO, R
LO
/2L and R
LO
/4L.
Procedure
Apply the measured quantity to the instrument and set the mea-
suring range with the Man / Auto softkey before activating the Data
function with the Data / MinMax softkey. Man appears at the display
with a green background. After activating the Data function with
the corresponding softkey, Man is grayed out and cannot be
changed until Data / MinMax is pressed again three times for deac-
tivation. Data appears at the display with a green background. If
automatic measuring range selection was active prior to activation
of the Data function, switching to manual measuring range selec-
tion is also disabled as long as the MinMax function is active.
Data and the associated value appear between the digital and
analog displays.
Measured Value Comparison (DATA Compare)
If the currently frozen value deviates from the first saved value by
less than 100 digits, the acoustic signal is generated twice. If devi-
ation is greater than 100 digits, only a brief acoustic signal is gen-
erated.
Note
The Data function has no effect on the analog display, at
which the current measured value continues to appear.
However, when the digital display is “frozen”, the decimal
point is fixed as well (fixed measuring range, Man appears
with a gray-green background).
The selected measuring range cannot be manually
changed as long as the Data function is active.
The Data function is deactivated by briefly pressing the Data / Min-
Max softkey three times, if you switch to the MinMax function,
when the measuring function is changed or when the instrument
is switched off and back on again.
V, A, Hz
t [s]
100%
10%
Activated
Reactivated
Save
Save
3000 digits
of measuring range
F, %