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V
AC
Alternating voltage measurement up to 600 V, true RMS without
the DC component. In AC a capacitor is inserted. The input
impedance of the HM8112-3 is R
V
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
max. INPUT
600V
/ 1A
rms
measurement
V
SENSE
A
DC
Direct current
measurement.
max.
max.
850
850
Auto range func-
Vpk
Vpk
tion up to and
including
the range 1 A
A
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
. 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
Ω 2-wire
resistance
measurement
max. INPUT
600V
For compensation
of the wiring resis-
tance with 2-wire
measurements
100 mΩ is stored by
max.
max.
default. This value
850
850
Vpk
Vpk
can be changed via
the interface.
Ω 4-wire
resistance
measurement
Voltage
measurement
+
(Sense)
max.
850
Vpk
–
Resistance measurement
4-wire
= 10 MΩ.
i
. The
DC
FUSE
1A
rms
F250V
A
SOURCE
+
HI
Direct or alter-
ϑ
Ω,
nating current
–
LO
max.
250V rms
CAT
II
.
FUSE
1A
/ 1A
rms
rms
F250V
V
A
SENSE
SOURCE
resistance
measurement
HI
+
ϑ
Ω,
2-wire
–
LO
max.
250V rms
CAT
II
FUSE
max. INPUT
1A
600V
/ 1A
rms
rms
F250V
V
A
SENSE
SOURCE
Power
input
+
HI
max.
ϑ
(Source)
Ω,
850
Vpk
–
LO
max.
250V rms
CAT
II
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
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 = infi nity). 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 measure
AC
the alternating voltage in V
call up the FREQ./PERIOD function.
STOP
Temperature measurement
Switching between 2-wire and 4-wire measurement by repea-
tedly pressing ϑPT-button
„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-
STOP
ment (see ZERO
).
ϑPT with 4-wire-temperature measurement
max. INPUT
600V
rms
SENSE
Voltage
measurement
+
max.
max.
(Sense)
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
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
fi rst and afterwards
AC
. This is indicated in the display by
. This
FUSE
1A
/ 1A
rms
F250V
V
A
SOURCE
Power
input
+
HI
ϑ
(Source)
Ω,
–
LO
max.
250V rms
CAT
II
Resolution
0.01 °C
0.01 °F
1 mA
100 μA
Subject to change without notice
HI
LO
II
43
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