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6 GMC-I Messtechnik GmbH
Setting Time and Date
See chapter 12 on page 17.
Switching the Instrument Off Manually
Ð Press and hold the ON|OFF key until OFF appears at the
display.
Shutdown is acknowledged with two, brief acoustic signals.
Switching the Instrument Off Automatically – SLEEP MODE
The instrument is switched off automatically if none of the
keys or the rotary switch are activated for approximately 10
minutes. Shutdown is acknowledged with a brief acoustic
signal.
Transmission mode: In this case, checking is first performed to
determine whether or not the sampling rate has been set to a
value of greater than 10 s. The instrument is switched off after
10 minutes, but the instrument is reactivated 10 s before data
is to be saved to memory. The instrument is then switched
back off again.
In the transmission mode, the instrument can be manually
activated with the ON|OFF key. After activation of this type, the
instrument returns to the “SLEEP MODE”.
If the instrument is to be fully shut down, it must first be
activated and then switched off with the ON|OFF key. This
ends both memory mode and transmission mode operation.
We recommend setting the instrument to continuous
operation for transmission mode operation.
The continuous operation mode is not effected by automatic
shutdown.
Disabling Automatic Shutdown
The instrument can be set to continuous operation.
Ð Press and hold the FUNC key and then switch the
instrument on by pressing the ON|OFF key. Continuous
operation is indicated at the display with the symbol.
Switching LCD Illumination On and Off (METRA HIT 27I only)
Ð Briefly press the ON|OFF key after the instrument has
already been switched on.
Illumination is switched off automatically after approximately 2
minutes.
Note: Electrical discharge and high frequency interference
may cause incorrect displays to appear, and may disable the
measuring sequence. In such cases, switch the instrument
off and back on again in order to reset. If the problem
persists, briefly dislodge the storage batteries or batteries
from the connector contacts.
Disconnect the instrument from the measuring circuit before
opening and refer to chapter 14.1, “Storage Batteries and
Batteries”!
3 Selecting Measuring Functions and Measuring Ranges
3.1 Automatic Measuring Range Selection
The multimeter is equipped with auto-ranging for all
measuring ranges, except for temperature measurement, and
diode and continuity testing. Auto-ranging is active as soon
as the multimeter is switched on. The instrument
automatically selects the measuring range which allows for
highest possible resolution for the applied quantity. When the
instrument is switched to frequency measurement, the
previously selected voltage measuring range remains active.
The instrument automatically switches to the next highest or
next lowest measuring range for the following measured
quantities:
3.2 Manual Measuring Range Selection
Auto-ranging can be deactivated and measuring ranges can
be selected manually in accordance with the following table.
The manual mode is deactivated by pressing and holding the
MAN|AUTO key (approx. 1 s), by activating the rotary switch, or
by switching the instrument off and then back on again.
Automatic range selection is disabled as long as the
MIN/MAX function is active.
Measuring Ranges
Resolu-
tion
Switching to next
highest range
at (... d +1 d)
Switching to next
lowest range
at (... d -1 d)
V~, V , Hz, m
30 / 300 m at 1 A
31,000 2800
3 m@1A, M@...V 3100 280
MAN|
AUTO
Function
Acknow-
ledgement
Dis-
play
Acoust.
Signal
short
Manual mode active:
utilized measuring range is fixed
MAN 1 x
short
Range switching sequence for:
V: 3V 30 V 300 V 600 V 3V
Hz: 300 Hz 3kHz 300 Hz 
:
30 M

300

3k

30 k

300k

3M

m:30m 300 m3  30 30 m
m@1A: 3 m30 m300 m3m
MAN 1 x
long Return to automatic range selection
2 x
6


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