User Manual

GMC-I Messtechnik GmbH 21
Control Functions
Example
The voltage measuring range is set manually to 6 V. The first mea-
sured value is 3 V and is stored to memory because it is greater
than 10% of the measuring range (6000 digits = 0.6 V), and is
thus reliably above the background noise level. As soon as the
measured value drops to less than 10% of the measuring range
(6000 digits), i.e. amounts to less than 6 V which corresponds to
removal of the test probes from the measuring point, the instru-
ment is ready to store a new value.
4.4.1 Saving Minimum and Maximum Values – Min/Max Function
Minimum and maximum measured values applied to the measu-
ring instrument’s input after the Min-Max function has been acti-
vated can be “frozen” at the auxiliary display along with time of
occurrence. The most important use of this function is the deter-
mination of minimum and maximum values during long-term mea-
sured value observation.
Except during power measurement, the Min-Max function has no
effect on the main display, at which the current measured value
continues to appear.
Apply the measured quantity to the instrument and set the
measuring range with the MAN / AUTO key before activating the
Min-Max function.
The Min-Max function is deactivated by pressing and holding the
DATA/MIN/MAX key (approx. 1 second), when the measuring func-
tion is changed, or when the instrument is switched off and back
on again.
Note
Extreme values can be reset by pressing the ZERO key.
Power Measurement (special case)
Instantaneous power is displayed with the switch in the W setting.
The Min-Max function is activated with the DATA/MIN/MAX key. The
minimum and maximum values for active, reactive and apparent
power are displayed as of the beginning of the power measure-
ment, along with time of occurrence (date and time).
Previous Min-Max values can be cleared without exiting the func-
tion by pressing the ZERO key.
This function differs from the general Min-Max function insofar as
measurement is performed continuously in the background, even
if the Min-Max display is not shown, and while the instrument is in
the energy measuring mode
Min-Max
Function
Data/
Min/Max
Key
Min. and Max.
Measured Values
Response from Instrument
Display
Acou-
stic
Sig-
nal
Digital
Measured
Value
Max.
Min.
1
Activate
and save
DATA/
MIN/MAX
1 x brief
Are
saved
Current
measured va-
lue
Once
2
Save and
display
DATA/
MIN/MAX
Brief
Storage continues in the back-
ground, new min. and max.
values are displayed together
with time.
Saved min.
value
Min. Once
Brief
Saved max.
value
Max. Once
Reset
ZERO/
ESC
Brief
Are deleted
Saved min.-
max. values
min/
max
1
Stop
DATA/
MIN/MAX
Long
are deleted
and function is exited
Current
measured va-
lue
Is dele-
ted
Twice