10
GMC-I Gossen-Metrawatt GmbH
3
Selection of Measurement Functions and
Measuring Ranges
The rotary switch is coupled to the automatic socket
blocking device, which makes two jacks available for each
function (except mA and A: 3 jacks. The jack for the “mA”
socket in the “A” function is half open). Before switching to
the “mA” or “A” functions, or out off the “mA” or “A” func-
tions, be certain that the plug has been removed from the
corresponding jack. The socket blocking device prevents
inadvertent switching to disallowed functions when a plug
connection exists.
3.1
Automatic Measuring Range Selection
The multimeter is equipped with automatic measuring
range selection for all measuring ranges, except for tem-
perature measurement and diode testing, as well as
respective continuity testing. This automatic feature is
active as soon as the instrument is switched on. The
instrument automatically selects the measuring range
which provides optimum resolution for the current mea-
sured quantity. The previously selected voltage measuring
range remains active after switching the instrument to fre-
quency measurement, events counting or count zero
crossing. The instrument is automatically switched to the
next highest or next lowest measuring range for the follow-
ing measured quantities:
1)
2800 digits apply when switching from 300 kHz to 30 kHz.
3.2
Manual Measuring Range Selection
The automatic measuring range feature can be deactivated
and the ranges can be manually selected and prescribed
according to the following table.
The manual mode is deactivated by pressing and holding
the
MAN|AUTO
key (approx. 1s), by activating the rotary
switch or by switching the instrument off and back on again.
Measuring Range
Reso-
lution
Switching to the Next
Highest Range
at
±
(... d + 1 d)
Switching to the Next
Lowest Range
at
±
(... d -1 d)
V
, mA
,
Ω
, Hz
1)
5 ¾
310,000
28,000
V
, V
, A
, mA
,
A
, 30 mF
4 ¾
31,000
2,800
3 nF ... 3 mF
3 ¾
3,100
280
⇓
MAN/
AUTO
Function
Acknowledge
Display
Acoust.
Signal
Brief
Manual Mode Active: selected measuring range is fixed
MAN
1 x
Brief
Switching Sequence for:
V:
300 mV
→
3 V
→
30 V
→
300 V
→
600 V
→
300 mV
→
...
dB:
same switching sequence as for V
mA : 300
μ
A
→
3 mA
→
30 mA
→
300 mA
→
300
μ
A ...
A:
3 A
→
10 A
→
3 A ...
Ω
:
30 M
Ω →
300
Ω →
3 k
Ω →
30 k
Ω →
300k
Ω →
3 M
Ω →
30 M
Ω
...
F:
3 nF
→
30 nF
→
300 nF
→
3
μ
F
→
30
μ
F
→
300
μ
F
→
3000
μ
F
→
30000
μ
F
→
3 nF ...
Hz:
300 Hz
→
3 kHz
→
300 kHz
→
300 Hz ...
MAN
1 x
Long
Return to Automatic Range Selection
—
2 x
