Hameg HM8112-3 Benutzerhandbuch Seite 53

Direct voltage measurement up to 600 V. No auto range function
in 100 mV and 1 V ranges.
V
8
AC
Alternating voltage measurement up to 600 V, true RMS wit-
hout the DC component. 100mV range is not possible. In AC a
capacitor is inserted. The input impedance of the HM8112-3 is
R = 10 MΩ.
i
V
10
AC+DC
Alternating voltage measurement up to 600 V, true RMS with
DC component. Direct coupling of the circuit to the instrument
and using of the same high precision input divider like V
input impedance of the HM8112-3 is 10 GΩ in 100 mV range,
10 MΩ in the other ranges.
Current measurement
max. INPUT
A
7
600V
DC
rms
Direct current
V
measurement.
SENSE
Auto range func-
tion up to and
including
max. max.
850 850
the range 1 A
Vpk Vpk
A
9
AC+DC
Alternating current measurement, true RMS with DC com-
ponent. Auto range function over the entire range of 1 A.
Resistance measurement
Switching between 2 wire and 4 wire measurement by repeatly
pressing Ω-button 11 . This is shown in the display by „2w" for
2 wire and by „4w" for 4 wire measurement. Additionally the
terminals to be used are illuminated. For exact measurements
it is necessary to null any offsets by pressing ZERO
11 Ω 2-wire
resistance
max. INPUT
600V
measurement
For compensation
of the wiring resis-
tance with 2-wire
measurements
max. max.
100 m Ω is stored by
850 850
Vpk Vpk
default. This value
can be changed via
the interface.
11 Ω 4-wire resistance
measurement
Voltage
measurement
+
(Sense)
max.
850
Vpk
–
Resistance measurement
4-wire
. The
DC
FUSE
1A
/ 1A
rms
F250V
A
SOURCE
+
HI
Direct or alter-
nating current
ϑ
Ω,
–
LO
max.
250V rms
II
CAT
.
4
FUSE
1A
/ 1A
rms rms
F250V
V A
SENSE SOURCE
resistance
measurement
+
HI
ϑ
Ω,
2-wire
–
LO
max.
250V rms
II
CAT
FUSE
max. INPUT
1A
600V / 1A
rms rms
F250V
V A
SENSE SOURCE
Power
input
+
HI
(Source)
max.
ϑ
Ω,
850
Vpk
–
LO
max.
250V rms
II
CAT
C o n t r o l e l e m e n t s a n d d i s p l a y
Frequency and period
+
Direct or
alternating voltage
–
FREQ./PERIOD
12
Switching between frequency and period measurement by re-
peatedly pressing this button. At measurement of DC voltage
the display shows "0 Hz" for frequency and "INF" for period
measurement (INF = infinity). As the period is calculated from
the measured frequency it is a division by zero.
There is no auto range function for frequency and
period measurements. That means the range of
the V measurement is taken. Is necessary to
AC
measure the alternating voltage in V
afterwards call up the FREQ./PERIOD function.
Temperature measurement
Switching between 2-wire and 4-wire measurement by repea-
tedly pressing δPT-button 13
„2w" for 2-wire and by "4w" for 4-wire measurement. Additional-
ly the terminals to be used are illuminated. For compensation of
the wiring resistance at 2-wire measurements 100 mΩ is stored
by default. This value can be changed via interface.
For exact measurements it is necessary to cali-
brate the measurement section with ZERO
calibration is done for PT sensors by resistance
measurement or for thermocouples by voltage
measurement but not by temperature measure-
ment (see ZERO
4
13 δPT with 4-wire-temperature measurement
max. INPUT
600V
rms
SENSE
Voltage
measurement
+
(Sense)
max. max.
850 850
Vpk Vpk
–
4-wire-temperature measurement with PT100
Measuring method:
4 wire resistance measurement with linearisation accor-
ding to EN60751 for PT100 and PT1000.
Temperature sensor:
PT100, PT1000 resistance sensors
Display range: Display scale
Celsius:
–200 °C to +800 °C
Fahrenheit:
–328 °F to +1472 °F
Test current:
PT100
PT1000
Test voltage
(open circuit): 2.5 V
FUSE
max. INPUT
1A
600V / 1A
rms rms
F250V
V A
SENSE SOURCE
max. max.
ϑ
Ω,
850 850
Vpk Vpk
max.
250V rms
CAT
first and
AC
. This is indicated in the display by
. This
4
).
FUSE
1A
/ 1A
rms
F250V
V A
SOURCE
Power
input
+
HI
(Source)
ϑ
Ω,
–
LO
max.
250V rms
II
CAT
Resolution
0.01 °C
0.01 °F
1 mA
100 µA
Subject to change without notice
HI
LO
II
53