null null

99 Washington Street
Melrose, MA 02176
Fax 781-665-0780
TestEquipmentDepot.com
6½-DIGIT
PRECISION-MULTIMETER
HM8112-3
Handbuch / Manual
Deutsch / English
Hersteller
Manufacturer
Fabricant
HAMEG GmbH
Industriestraße 6
D-63533 Mainhausen
KONFORMITÄTSERKLÄRUNG
DECLARATION OF CONFORMITY
DECLARATION DE CONFORMITE
Die HAMEG GmbH bescheinigt die Konformität für das Produkt
The HAMEG GmbH herewith declares conformity of the product
HAMEG GmbH déclare la conformite du produit
Überspannungskategorie / Overvoltage category / Catégorie de surtension: II
Bezeichnung / Product name / Designation:
Präzisions-Multimeter
Precision-Multimeter
Multimétre de précision
Elektromagnetische Verträglichkeit / Electromagnetic compatibility /
Compatibilité électromagnétique
Typ / Type / Type:
HM8112-3
mit / with / avec:
–
Optionen / Options / Options:
–
Verschmutzungsgrad / Degree of pollution / Degré de pollution: 2
EN 61326-1/A1 Störaussendung / Radiation / Emission:
Tabelle / table / tableau 4; Klasse / Class / Classe B.
Störfestigkeit / Immunity / Imunitee: Tabelle / table / tableau A1.
mit den folgenden Bestimmungen / with applicable regulations / avec les
directives suivantes
EMV Richtlinie 89/336/EWG ergänzt durch 91/263/EWG, 92/31/EWG
EMC Directive 89/336/EEC amended by 91/263/EWG, 92/31/EEC
Directive EMC 89/336/CEE amendée par 91/263/EWG, 92/31/CEE
EN 61000-3-2/A14 Oberschwingungsströme / Harmonic current emissions /
Émissions de courant harmonique:
Klasse / Class / Classe D.
EN 61000-3-3 Spannungsschwankungen u. Flicker / Voltage fluctuations and
flicker / Fluctuations de tension et du flicker.
Datum /Date /Date
01.12.2004
Niederspannungsrichtlinie 73/23/EWG ergänzt durch 93/68/EWG
Low-Voltage Equipment Directive 73/23/EEC amended by 93/68/EEC
Directive des equipements basse tension 73/23/CEE amendée par 93/68/CEE
Unterschrift / Signature /Signatur
Angewendete harmonisierte Normen / Harmonized standards applied /
Normes harmonisées utilisées
Sicherheit / Safety / Sécurité
EN 61010-1:2001 (IEC 61010-1:2001)
G. Hübenett
Produktmanager
General remarks regarding the CE marking
HAMEG measuring instruments comply with the EMI norms. Our tests for
3. External influences
conformity are based upon the relevant norms. Whenever different maximum
In the vicinity of strong magnetic or/and electric fields even a careful measuring
limits are optional HAMEG will select the most stringent ones. As regards
set-up may not be sufficient to guard against the intrusion of undesired signals.
emissions class 1B limits for small business will be applied. As regards
This will not cause destruction or malfunction of HAMEG instruments, however,
susceptability the limits for industrial environments will be applied.
small deviations from the guranteed specifications may occur under such
conditions.
All connecting cables will influence emissions as well as susceptability
considerably. The cables used will differ substantially depending on the
application. During practical operation the following guidelines should be
absolutely observed in order to minimize EMI:
1. Data connections
Measuring instruments may only be connected to external associated
equipment (printers, computers etc.) by using well shielded cables. Unless
shorter lengths are prescribed a maximum length of 3 m must not be exceeded
for all data interconnections (input, output, signals, control). In case an
instrument interface would allow connecting several cables only one may be
connected.
In general, data connections should be made using double-shielded cables.
For IEEE bus connections the double-shielded HAMEG cables HZ72S and HZ72L
are suitable.
2. Signal connections
In general, all connections between a measuring instrument and the device
under test should be made as short as possible. Unless a shorter length is
prescribed a maximum length of 3 m must not be exceeded, also, such
connections must not leave the premises.
All signal connections must be shielded (e.g. coax such as RG58/U). With signal
generators double-shielded cables are mandatory. It is especially important
to establish good ground connections.
32
Subject to change without notice
HAMEG GmbH
C o n t e n t
Deutsch
English
3
32
Decleration of Conformity
32
General remarks regarding the CE marking
32
6½-Digit Precision-Multimeter HM8112-3
35
Specifications
35
Important hints
Symbols
Unpacking
Positioning
Transport
Storage
Safety instructions
CAT II
Proper operating conditions
Warranty and Repair
Maintenance
Protective Switch Off
Power supply
Line fuse
Power switch
36
36
36
36
36
36
36
36
37
37
37
37
37
37
37
Control-Elements
38
Concept of the HM8112-3
Reference
Integrated AD converters
Moving average
Measurement of alternating values
39
39
39
39
39
Introduction to the operation of the HM8112-3
Factory settings
39
39
Control elements and displays
Buttons for the various measurement functions
Continuity test
Max / Min values
Range selection
40
40
42
42
42
Menu structure
Menu prompting
Menu structure and function
43
44
45
Measurement inputs
46
Serial Interface
47
Data communication
Layout of commands
Listing of commands
47
47
48
Subject to change without notice
33
H M 8 1 1 2 - 3
6½-Digit Precision-Multimeter
HM8112-3
6½-digit LCD-display (1.200.000 points)
True rms measurements of AC+DC or AC
2-wire- / 4-wire measurements
Resolutions 100 nV, 100 pA, 100 µΩ, 0,01 °C / °F
Offset correction
HZ42 19’’-rackmont-kit
Range selection automatically and manual
10 measurements per second
Measuring time 0,1 sec to 60 sec
Precise temperature
measurement with sensor
HZ887
Input impedance >1 GΩ (0,1 V and 1VDC ranges)
RS-232 Interface (Option: USB, IEEE-488)
˚C
˚F
34
Subject to change without notice
RS-232
Specifications
6½-Digit Precision-Multimeter HM8112-3
SPECIFICATIONS
Valid at 23 degrees °C after a 30 minute warm-up period
DC Specifications
Ranges:
0.1 V; 1 V; 10 V; 100 V; 600 V
Input impedance:
0.1 V; 1.0 V
>1 GΩ
10 V; 100 V; 600 V
10 MΩ
Accuracy:
Values given are in ±(% of reading + % of full scale)
Range
0.1 V
1.0 V
10.0 V
100.0 V
600.0 V
1 year; 23 ±2 °C
% rdg. + % f.s.
Temperature coefficient
10...21 °C + 25...40 °C
0.005
0.003
0.003
0.003
0.004
0.0008
0.0008
0.0008
0.0008
0.0008
+
+
+
+
+
Integration time:
Display range:
600 V range:
Resolution:
Zero point
Temperature coefficient:
Long term stability:
AC specifications
Ranges:
Measuring method:
0.0006
0.0006
0.0006
0.0006
0.0006
≤ 0,3 µV/°C
≤ 3 µV for 90 days
0.1 V; 1 V; 10 V; 100 V; 600 V
true rms DC or AC coupled
(except 0.1 V range)
Input impedance:
0.1 V:
1 GΩ II <60 pF
1 V to 600 V:
10 MΩ II <60 pF
Response time:
1.5 sec to within 0,1% of rdg.
Accuracy: For sine wave signals > 5% of range.
Values given are in ±(% rdg. +% f.s.);23 ±2 °C for 1 year
20 Hz –
1 kHz
1 kHz –
10 kHz
10 kHz –
50 kHz
0.1 V
1.0 V
10.0 V
100.0 V
600.0 V
0.10 +0.08
0.08 +0.08
0.08 +0.08
0.08 +0.08
0.08 +0.08
5+0.5 (5 kHz)
0.15+0.08 0.3+0.1
0.10+0.08 0.3+0.1
0.10+0.08 0.3+0.1
0.10+0.08
1 mΩ
100 µΩ
Values given are in ±(% rdg. + % f.s.)
Range
1 year; 23 ±2°C
%rdg. + %f.s.
Temperature coefficient/°C
10...21 °C and 25...40 °C
100 Ω
1 kΩ
10 kΩ
100 kΩ
1 MΩ
10 MΩ
0.005
0.005
0.005
0.005
0.05
0.5
0.0008
0.0008
0.0008
0.0008
0.002
0.01
Measuring current:
max. measuring voltage:
Overload protection:
0.1 sec
1 to 60 sec
120,000 digit 1,200,000 digit
600,00 digit 600,000 digit
1 µV
100 nV
Range
Resolution:
Accuracy:
50 kHz –
100 kHz
100 kHz –
300 kHz
0.8+0.15
0.8+0.15
0.8+0.15
7+0.15
4+0.15
Current specifications
Ranges:
100 µA; 1 mA; 10 mA; 100 mA; 1 A
Integration time:
0.1 sec
1 to 60 sec
Display ranges:
120,000 digit 1,200,000 digit
1 A range:
100,000 digit 1,000,000 digit
Resolution:
1 nA
100 pA
Accuracy:
DC
45 Hz–1 kHz 1 kHz–5 kHz
(1 year; 23 ±2 °C)
0.02+0.002
0.1+0.08
0.2+0.08
Temperature coefficient:
10...21 °C
25...40 °C
(% rdg. + % f.s.):
0.002+0.001 0.01+0.01
Voltage:
<600 mV to 1,5 V
Response time:
1.5 sec to within 0.1% of rdg.
Crest factor:
7:1 (max. 5 x range)
Overload protection:
Fuse FF 1 A 250 V
Resistance specifications
Ranges:
100Ω, 1kΩ, 10kΩ, 100kΩ, 1MΩ, 10MΩ
Integration time:
0.1 sec
1 to 60 sec
Display ranges:
120,000 digit 1,200,000 digit
0.0015
0.001
0.001
0.001
0.002
0.02
Range
100 Ω, 1kΩ
10 kΩ
100 kΩ
1 MΩ
10 MΩ
approx. 3 V
250 V peak
Current
1 mA
100 µA
10 µA
1 µA
100 nA
Temperature measurement specifications
PT100 / PT1000 (EN60751) 2- or 4-wire measurements
Range:
–200 °C to +800 °C
Resolution:
0.01 °C; measuring current 1mA
Accuracy:
±(0.05 °C + tolerance of sensor +0.08 K)
Temperature coefficient
(10...21 °C + 25...40°C:
<0.0018 °C/°C
NiCr-Ni (K-Type)
Range:
–270 °C to +1372 °C
Resolution:
0.1 °C
Accuracy:
±(0.7% rdg. +0.3 K)
Fe-CuNi (J-Type)
Range:
–210 °C to +1200 °C
Resolution:
0.1 °C
Accuracy:
±(0.7% rdg. +0.3 K)
Frequency and period specifications
Range:
1 Hz to 100 kHz
Resolution:
0.00001 Hz to 1 Hz
Accuracy:
0.05% (rdg.)
Measuring time:
1 to 2 sec
RS-232 Interface
RS-232 standard:
Functions:
Inputs:
Outputs:
Temperature coefficient 10...21°C and 25...40°C; (%rdg. + %f.s.)
at 20 Hz - 10 kHz:
0.01 + 0.008
at 10 kHz - 100 kHz:
0.08 + 0.01
Crest factor:
7:1 (max. 5 x range)
Integration time:
0.1 sec
1 to 60 sec
Display range:
120,000 digit 1,200,000 digit
600 V range:
60,000 digit 600,000 digit
Resolution:
1 µV
100 nV
Overload protection:
(V-HI to V- LO) and to chassis:
Measurement ranges: all
all the time
850 Vpeak or 600 VDC
Maximum input voltage LOW against
chassis/safety earth:
250 Vrms at max. 60 Hz or 250 VDC
+
+
+
+
+
+
9600 or 19200 Baud
Control / Data fetch
Function, range, integration time, start
command
Measurement results, function, range,
integration time (10 ms to 60 s)
Miscellaneous
Time to change range or function:
approx. 125 ms with DC voltage, DC current, resistance
approx. 1 sec with AC voltage, AC current
Memory:
30.000 readings / 128 kB
Protective class:
I, EN 61010 (IEC 1010)
Power supply:
105–254 V; 50/60 Hz
Power consumption:
approx. 8 W
Operating temperature:
+10 °C....+40 °C
Storage temperature:
–40 °C....+70 °C
Humidity:
<75 %, no condensation
Size (W x H x D):
285 x 75 x 365 mm
Weight:
approx. 3 kg
Optionen:
USB- bzw. IEEE-Schnittstelle
Subject to change without notice
Included in delivery:
Multimeter HM8112-3, line cord, manual, HZ15 measuring cables
Accessories optional:
HZ887: Temperataure sensor (PT100; -50°C...+400°C )
HZ42:19" Rackmount-kit 2RU for frame height 75mm
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Subject to change without notice
35
Important
hints
Transport
Important hints
Please keep the carton in case the instrument may require
later shipment for repair. Losses and damages during
transport as a result of improper packaging are excluded from
warranty!
(1)
(2)
(3)
Symbols
Symbol 1:
Symbol 2:
Symbol 3:
Symbol 4:
Symbol 5:
Symbol 6:
(4)
HINT
STOP
Storage
(5)
(6)
Dry indoor storage is required. After exposure to extreme
temperatures, wait 2 hr before turning the instrument on.
STOP
Attention, please consult manual
Danger! High voltage!
Ground connection
Important note
Hints for application
Stop! Possible instrument damage!
Unpacking
Please check for completeness of parts while unpacking. Also
check for any mechanical damage or loose parts. In case of
transport damage inform the supplier immediately and do not
operate the instrument.
Safety instructions
The instrument conforms to VDE 0411/1 safety standards
applicable to measuring instruments and it left the factory in
proper condition according to this standard. Hence it conforms
also to the European standard EN 61010-1 resp. to the international standard IEC 61010-1. Please observe all warnings
in this manual in order to preserve safety and guarantee
operation without any danger to the operator. According to
safety class 1 requirements all parts of the housing and the
chassis are connected to the safety ground terminal of the
power connector. For safety reasons the instrument must only
be operated from 3 terminal power connectors or via isolation
transformers. In case of doubt the power connector should
be checked according to DIN VDE 0100/610.
Positioning
Do not disconnect the safety ground either inside
or outside of the instrument!
Two positions are possible: According to picture 1 the front
feet are used to lift the instrument so its front points slightly
upward. (Appr. 10 degrees)
–
If the feet are not used (picture 2) the instrument can be
combined with many other HAMEG instruments.
In case several instruments are stacked (picture 3) the feet
rest in the recesses of the instrument below so the instruments can not be inadvertently moved. Please do not stack
more than 3 instruments. A higher stack will become unstable,
also heat dissipation may be impaired.
picture 1
–
–
In any of the following cases the instrument must be taken
out of service and locked away from unauthorized use:
–
–
–
–
–
–
–
picture 2
The line voltage of the instrument must correspond to the
line voltage used.
Opening of the instrument is only allowed to qualified
personnel
Prior to opening, the instrument must be disconnected
from the line voltage and all other inputs/outputs.
Visible damage
Damage to the power cord
Damage to the fuse holder
Loose parts
No operation
After long term storage in an inappropriate environment,
e.g. open air or high humidity.
Excessive transport stress
CAT II
The following remarks concern only the safety of the user.
Other aspects e.g. the maximum input voltage etc. are covered
in the specifications section of this manual and are to be
observed as well.
picture 3
Measurements in circuits which are indirectly connected with
the mains supply are possible with adequate converters (e.g.
clamp-on ammeters) which fulfil at least the requirements of
the safety class of the measurement. The measurement
category of the converter specified by the manufacturer must
be considered.
Measurement categories CAT
The measurement categories were created with respect to
the different kind of transients incurred in practice. Transients
36
Subject to change without notice
Important
instrument. Customers from the Federal Republic of Germany
may directly contact HAMEG for warranty processing in order
to speed up the procedure.
Overhead lines
Premises
In-house
installation
CAT IV
Permanently installed
machinery, distribution sites,
power conductors, mains
outlets close to the CAT IV
installation
CAT III
Mains outlets for
household appliances,
portable tools, PC,
refrigerator etc.
The proceeding of repairs during the warranty period is subject
to our terms of warranty which are available on our web-site
(http://www.hameg.com). Even after expiry of the warranty
period please do not hesitate to contact our HAMEG customer
service for repairs and spare parts.
CAT II
Return Material Authorization (RMA):
Before sending back your instrument to HAMEG do
apply for a RMA number either by fax or on the
Internet: http://www.hameg.de.
If you do not have suitable packaging for the instrument on hand please contact the HAMAG sales
department (Tel.: +49 (0) 6182/800 300, E-mail:
[email protected]) to order an empty original
cardboard box.
are short, fast, and fast-rise changes of voltage or current,
and may be periodic or non-periodic. The amplitude of
transients increases with decreasing distance from their
source.
STOP
CAT IV: Measurements at the source of a low voltage supply,
e.g. at electricity meters.
Maintenance
CAT III: Measurements inside a building, e.g. at distribution
sites, power switches, permanently installed mains
outlets, permanently mounted motors etc.
The instrument does not require any maintenance. Dirt may
be removed by a soft moist cloth, if necessary adding a mild
detergent. (Water and 1 %.) Grease may be removed with
benzine (petrol ether). Displays and windows may only be
cleaned with a moist cloth.
CAT II: Measurements in circuits which are directly
connected with the low voltage supply, e.g. household
appliances, portable tools etc.
CAT I:
hints
Electronic instruments and circuits which contain
circuit breakers resp. fuses.
STOP
Do not use alcohol, solvents or paste. Under no
circumstances should any fluid be allowed to get
into the instrument. If other cleaning fluids are
used damage to the lacquered or plastic surfaces
is possible.
Proper operating conditions
Mains voltage
Operation in the following environments: industry, business
and living quarters, small industry. The instruments are
intended for operation in dry, clean environments. They must
not be operated in the presence of excessive dust, humidity,
nor chemical vapours in case of danger of explosion.
The maximum permissible ambient temperature during
operation is +10 to +40 deg. C. In storage or during transport
the temperature limits are: –40 to +70 deg. C. In case of
exposure to low temperature or if condensation is suspected,
the instrument must be left to stabilize for at least 2 hrs prior
to operation.
A main voltage of 115V and 230V can be chosen. Please check
whether the mains voltage used corresponds with the voltage
indicated by the mains voltage selector 30 on the rear panel.
If not, the voltage has to be changed.
Line fuse
The instrument has 2 internal line fuses: T 0.2 A. In case of a
blown fuse the instrument has to be sent in for repair. A change
of the line fuse by the customer is not permitted.
Power switch
In principle the instrument may be used in any position,
however sufficient ventilation must be ensured. Operation for
extended periods of time requires the horizontal or tilted
(handle) position.
Nominal specifications are valid after 30 minutes warm-up at
23 deg. C. Specifications without tolerances are typical values
taken of average production units.
Warranty and Repair
HAMEG instruments are subject to a strict quality control. All
instruments are burned in for 10 hrs prior to shipment. Almost all early failures are detected by intermittent operation.
After burn-in a thorough test of all functions and of quality is
run, all specifications and operating modes are checked.
Normally the power switch 28 on the rear
panel of the instrument should be stay in “ON“
position. If using the Standby-button on the
front panel, only the controls and the display
are turned off. The instrument itselfs stays
turned on as long as it is connected to the
supply voltage. This has the advantage that
the instrument is immediately functional after
turn-on. Also the reference voltage source will
remain energized, so any drift after turn-on will be eliminated,
also its long term drift will be substantially improved. To switchoff the instrument completely, the power switch on the back panel
has to be operated.
In case of claims during the two years warranty period please
contact the dealer from whom you purchased your HAMEG
If the instrument is left unattended for some time,
the power switch on the rear panel has to be
operated. (Because of safety reasons!)
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Subject to change without notice
37
Control
2
3 4
5
elements
1
6
27
7 8
9 10 11 12 13 14 15
16 17
Control elements
19 20 18 21 22 23
HOLD DISPLAY – storage of the displayed value
VDC – Measurement of DC voltage
ADC – Measurement of DC current
VAC – Measurement of AC voltage with AC coupling
26
MIN – min. value during a test series
18
MENU – Call of the menu, acceptance of values entered
19
ESC – Leaving the menu without acceptance of the
values entered
20
– down: Switching to a higher range and scrolling
down the menu
21
AUTO – Activation/Deactivation of the auto range
function
22
ENTER – Special function: Parameter selection in the
logger menu
23
– up: Switching to a lower range and scrolling up the
menu
24
V SENSE – Input for measurements of voltage,
frequency, resistance, temperature
ZERO – 0-compensation of the measuring section
RM/LOCAL-pushbutton – Return to manual mode
25
17
DISPLAY – 16 digit display
POWER – Stand by / ON
24
AAC – Measurement of AC current
VAC+DC – Measurement of AC voltage with DC coupling
25
LO – Ground connection for inputs
11
Ω – Measurement of resistance, 2- and 4-wire
26
A SOURCE – Input for current measurement
12
FREQ./PERIOD – Frequency and period measurement
with VAC
27
FUSE – 1 A / 250 V (FF) Measuring circuit fuse
13
ϑPT - Measurement of temperature using a PT-sensor,
2- and 4-wire
14
15
16
- Diode test / Continuity test
ϑTH – Measurement of temperature using a
thermocouple, 2-wire
MAX – max. value during a test series
29
24
26
and
Rear panel
28
Power receptacle with power switch
29
RS-232 Interface (Option: USB, IEEE-488)
30
Voltage selector (115 V / 230 V)
28
30
38
Subject to change without notice
Introduction to the operation of the HM8112-3
Concept of the HM8112-3
very high frequencies within a reasonable time. Applying of a
DC voltage results in a frequency displayed of 0 Hz.
As the period is calculated from the measured frequency
division by zero will be made. Therefore the instrument will
display „INF“ if the period of a DC voltage is measured („INF“
= infinity).
Reference
The integrated AD converter has to be connected to a reference.
The characteristics of this reference determine the long term
stability of the instrument. The reference of HM8112-3 is therefore
a high precision reference device.
Integrated AD converters
Converters applying the multi slope method are used for AD
conversion.
RMS rectifier
The AC voltage is measured by a high precision RMS rectifier
device. This device gauges a DC voltage proportional to the
applied AC voltage. This DC voltage is equivalent to the true
RMS value of the AC voltage.
Measurement of the crest factor
For crest factors exceeding 7 an AC voltage or current
measurement will be incorrect due to the true RMS converter.
Moving average
Introduction to the operation of the HM8112-3
Especially before the first operation please pay attention to
the following points:
–
–
–
–
–
The line voltage, indicated on the rear panel of the
instrument must correspond to the line voltage used.
Operation is only allowed from 3 terminal connectors with
a safety ground connection or via isolation transformers
of class 2.
No visible damage to the instrument.
No damage to the line power cord.
No loose parts in the instrument.
Factory settings
The value determined by the AD converter could be displayed
without prior computations, also the average calculated from
n – values could be shown. First of all 1 to n values will be
logged. Averaging over these values will be done, and subsequently this average will be displayed. After 120 values the
next value n+1 will be quantified by the AD converter. The
primary measured value 1 will be abolished and a new average
will be calculated from the remaining values ( 2 to n) and from
the new value n+1. This has the advantage that peaks and
interferences will be smoothed.
The following values are set by default:
– The measurement range is
– The sampling rate amounts to
– The function „1:Filter“ is
– The temperature is displayed in
– The selected temperature sensor is
– The data logger is
– The RS-232 interface is
10 VDC
100 ms
OFF
°C
PT100
OFF
OFF
Measurement of alternating values
Frequency, period
Frequency and period are both measured by a pulse-counting
circuit. Time base is 1 second. The first falling edge triggers
the measurement and starts the counter. For one second every
falling edge will trigger a counting pulse. After expiry of this
term the measurement circuit will wait for the next zero point.
Hence the signal’s period is measured. The time will be
measured until the next zero point occurs. The measurement
result determines the frequency of the signal and the period
will be calculated from the frequency. This combined
measurement of the number of zero points and of the period
of a signal allows the measurement of very small as well as
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Subject to change without notice
39
Control elements and display
2
3 4
5
1
6
7 8
27
9 10 11 12 13 14 15
16 17
19 20 18 21 22 23
25
26
is to be pressed to compensate for
3. The ZERO button
influences within the measurement circuit.
4. After compensation jump to the adequate temperature
measurement function by pressing ZERO
Control elements and displays
Display
16 digit display for displaying measurement results, menu
selection and menu items.
POWER
Button for activating standby-function. The controls and the
display are turned off. The instrument itself stays turned on
as long as it is connected to the supply voltage. This has the
advantage that the instrument is immediately functional after
turn-on. Also the reference voltage source will remain
energized, so any drift after turn-on will be eliminated, also
its long term drift will be substantially improved.
To switch-off the instrument completely, the line switch on
the back panel has to be operated.
HOLD
“Freezing“ of the displayed measured value.
By pressing one of the function selection buttons
MENU 18 the HOLD function is left.
24
to 15 or
ZERO
Zero for DC voltage, DC current, 4-wire-resistance and 2-wireresistance measurements. The ZERO function is not provided
for AC voltage and AC current measurements. Both cables
have to be shorted and the ZERO button has to be pressed.
This results in elimination of the resistances of the measurement cables, resistances and thermal voltages at the junction
of different metals.
Compensation values remain, even after turn-off the instrument. They have to be redetermined if necessary.
STOP
Some measurement instruments offer an „automatic zero function“. This function regularly interrupts the measurement and shorts the input. Then
a partial 0-adjustment is made.
The HM8112-3 has no AUTO ZERO function,
because the zero adjustment of the complete
measurement circuit is very important.
LOCAL
By sending a command via interface to the HM8112-3 the
instrument is set to the remote mode. Remote control is
switched off by pressing button LOCAL. The instrument
returns to manual mode and can be operated from the front
panel.
Buttons for the various measurement functions
If the measurement function is changed, the HM8112-3
assumes the sampling rate selected, unless a sampling rate
between 10 s and 60 s is chosen. Then changing the measuring
function will set the sampling rate automatically to 1 s.
The buttons offering more functions are illuminated. Naturally,
other measuring functions can be called up by pressing
unlighted buttons. The terminals are illuminated, too, and
indicate the terminals to be used with the corresponding
functions.
Voltage Measurement
The ZERO button is deactivated in the measuring
functions ϑPT for PT sensors or ϑTH for
thermocouples.
Zero adjustment with temperature measurement
1. With regard to the type of temperature sensor one the
STOP
following measurement ranges must be chosen:
PT100
Ω 2 wire / Ω 4 wire 1 kΩ range
PT1000 Ω 2 wire / Ω 4 wire 10 kΩ range
100 mV range
Thermocouple VDC
Whether 2-wire- or 4-wire-measurement has to be
selected depends on the PT temperature sensor used.
2. Short the temperature sensor.
40
Subject to change without notice
FUSE
1A
F250V
max. INPUT
600V rms / 1A rms
VDC
V
A
SENSE
SOURCE
+
Direct or
alternating voltage
HI
max. max.
850 850
Vpk Vpk
Ω, ϑ
–
LO
max.
250V rms
CAT II
Direct voltage measurement up to 600 V. No auto range
function in 100 mV and 1 V ranges.
Control elements and display
VAC
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 Ri = 10 MΩ.
Frequency and period
FUSE
1A
F250V
max. INPUT
600V rms / 1A rms
V
A
SENSE
SOURCE
+
VAC+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 VDC.
The input impedance of the HM8112-3 is 10 GΩ in 100 mV
range, 10 MΩ in the other ranges.
Current
measurement
FUSE
1A
F250V
max. INPUT
600V rms / 1A rms
ADC
Direct current
measurement.
Auto range function up to and
including
the range 1 A
V
A
SENSE
SOURCE
max. max.
850 850
Vpk Vpk
LO
CAT II
12 FREQ./PERIOD
Switching between frequency and period measurement by
repeatedly 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 VAC measurement is taken. Is necessary to
measure the alternating voltage in VAC first and
afterwards call up the FREQ./PERIOD function.
–
LO
max.
250V rms
Ω, ϑ
max.
250V rms
Direct or alter
alter-nating current
Ω, ϑ
max. max.
850 850
Vpk Vpk
–
+
HI
HI
Direct or
alternating voltage
STOP
CAT II
AAC+DC
Alternating current measurement, true RMS with DC component. Auto range function over the entire range of 1 A.
Temperature measurement
Switching between 2-wire and 4-wire measurement by
repeatedly pressing ϑPT-button 13 . This is indicated in the
display by „2w“ for 2-wire and by “4w“ for 4-wire measurement.
Additionally 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.
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 .
For exact measurements it is necessary to calibrate the measurement section with ZERO . This
calibration is done for PT sensors by resistance
measurement or for thermocouples by voltage
measurement but not by temperature measurement (see ZERO ).
STOP
13 ϑPT with 4-wire-temperature measurement
11 Ω 2-wire
resistance
measurement
For compensation
of the wiring resistance with 2-wire
measurements
100 mΩ is stored by
default. This value
can be changed via
the interface.
V
A
SENSE
SOURCE
Voltage
measurement
resistance
measurement
(Sense)
Ω, ϑ
2-wire
A
SOURCE
Power
input
HI
max. max.
850 850
Vpk Vpk
–
–
LO
max.
250V rms
V
SENSE
+
+
HI
max. max.
850 850
Vpk Vpk
FUSE
1A
F250V
max. INPUT
600V rms / 1A rms
FUSE
1A
F250V
max. INPUT
600V rms / 1A rms
+
(Source)
Ω, ϑ
LO
max.
250V rms
–
CAT II
CAT II
4-wire-temperature measurement with PT100
11 Ω 4-wire
resistance
measurement
FUSE
1A
F250V
max. INPUT
600V rms / 1A rms
Voltage
measurement
V
A
SENSE
SOURCE
+
(Sense)
LO
max.
250V rms
CAT II
Temperature sensor:
PT100, PT1000 resistance sensors
+
(Source)
Ω, ϑ
–
Resistance measurement
4-wire
Power
input
HI
max. max.
850 850
Vpk Vpk
Measuring method:
4 wire resistance measurement with linearisation
according to EN60751 for PT100 and PT1000.
–
Display range:
Celsius:
Fahrenheit:
Test current:
Display scale
–200 °C to +800 °C
–328 °F to +1472 °F
PT100
PT1000
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Resolution
0.01 °C
0.01 °F
1 mA
100 µA
Subject to change without notice
41
Control elements and display
Test voltage
(open circuit):
Measurement
period:
Delay:
Calibration:
Linearisation:
Continuity test
2.5 V
14
Continuity and diode test
100 ms to 60 s
100 ms (after change of function or range)
with resistance measurement standard
PT100
1 kΩ range
PT1000
10 kΩ range
according to EN60751
FUSE
1A
F250V
max. INPUT
600V rms / 1A rms
V
A
SENSE
SOURCE
HI
13 ϑPT with 2-wire-temperature measurement
Limited accuracy of measured values for 2-wire-temperature
measurement with platinum temperature sensors PT100 or
PT1000.
V
A
SENSE
SOURCE
Power
input
HI
max. max.
850 850
Vpk Vpk
Ω, ϑ
LO
max.
250V rms
test
–
CAT II
Continuity test:
Activating of the loudspeaker for measured values between
0 Ω (short-circuit) and approx. 10 Ω.
FUSE
1A
F250V
max. INPUT
600V rms / 1A rms
max. max.
850 850
Vpk Vpk
+
Continuity
+
Ω, ϑ
Diode test:
(Source)
–
LO
max.
250V rms
Test voltage approx. 2.5 V
Test current 1 mA constant
Max. forward voltage 1.2 V, otherwise
“Overflow VDC“ is displayed.
CAT II
Adjustment of measuring section with PT sensor
PT sensors have an output resistance which is mostly referred
in the data sheet. Often the data sheet is lost but the sensor is
still there. In HM8112-3 a value of 100 mΩ is stored by default.
But some PT sensors have an integrated series resistance
(e.g. 10 mΩ). For an optimal adjusted measuring section the
exact output resistance must be known. This applies for 4wire measurement but especially for 2-wire measurements.
Via interface the default value stored ex factory can be aligned.
Values between 0 mΩ and 100 mΩ are possible.
Determination of the output resistance
The PT100 or PT1000 sensor has to be immersed in an ice
bath. At 0 °C the sensor has a resistance of 100 Ω and 1000 Ω
respectively. The resistance of the temperature sensor is taken
by a resistance measurement. The output resistance is the
difference between the measured value and the specified value.
15 ϑTH temperature measurement with thermocouples
FUSE
1A
F250V
max. INPUT
600V rms / 1A rms
V
A
SENSE
SOURCE
+
thermocouples
HI
max. max.
850 850
Vpk Vpk
STOP
The test unit must be at zero potential during
continuity test.
Max / Min values
16 MAX / 17 MIN
The maximum or minimum measured value is displayed. As
this is possible in every measurement function, a system can
be controlled with respect to min/max values. There is no time
limitation, e.g. for activating this function for one year, the
minimum or maximum value measured during this year will
be displayed. This function is deactivated by pushing the keys
16 MAX or 17 MIN again. Changing the measurement function
will deactivate this function, too.
Range selection
Manual range selection
The range can be selected manually by pressing
23 .
20
and
20
Switch to a lower range. The auto range function will
be deactivated.
23
Switch to a higher range. The auto range function will
be deactivated.
Ω, ϑ
–
LO
max.
250V rms
If the applied measurement value exceeds the range, the
display will show „Overflow“.
CAT II
Measuring method:
Voltage measurement in 100 mV
range with linearisation according to
EN60584.
Display range:
Thermocouples
Range up to °C
J- Type (Fe-CuNi)
–210 to +1200
K – Type (NiCr-Ni)
–270 to +1372
Resolution:
0.1 °C / °F
Measurement period: 100 ms to 60 s
Delay:
100 ms (after change of function)
Display:
Dimension °C or °F
Linearisation:
according to EN60584
42
Subject to change without notice
21 AUTO
With button AUTO the auto range function can be activated.
This function is selectable for voltage, current and resistance
measurements.
As the autorange function is activated a higher range will be
selected after the measured value exceeds 90% of full scale.
The HM8112-3 will change to a lower range, if the value falls
below 10% of full scale. If the signal applied exceeds the
specified limits of the instrument in the autorange function,
the display shows “overflow“.
Menu
The autorange function is to be used with care. For
measurements on high impedance source and
measurement voltages in the range (90%) of full
scale 1 V, changing to a higher range is possible
with activated AUTO function. The HM8112-3 has
an input impedance of 10MΩ in the 10 V range
instead of 1 GΩ in the 1 V range. By loading a high
impedance source of several 100 MΩ with by input
impedance of 10 MΩ the measurement result will
HINT be errouneous.
Menu structure
That means, for example, that every 500 ms a measurement
is taken and the value is updated in the display. After switchon a value of 100 ms will be preset. Removal of the line voltage
will not save a selected value.
If the measurement function is changed, the HM8112-3
assumes the default sampling rate, unless a sampling rate
between 10 s and 60 s is chosen. Then changing the measuring
function sets the sampling rate automatically to 1 s.
Example: The sampling rate for VDC is set to 60 s. Then the
function ADC is selected. The instrument will reduce the
sampling rate automatically to 1 s. The new sampling rate
applies to all functions. If a sampling rate greater than 1 s is
needed, it has to be selected after every change of function.
A sampling rate of 60 s means:
The HM8112-3 integrates the input voltage and the
the reference voltage over a period of 60 s. After
expiry of this time the value calculated will be
displayed.
Menu prompting
From every measurement function the menu can be entered
by pressing MENU 18 . Within the menu, every button which
can be used is illuminated. The menu can be always left by
pressing ESC 19 without acceptance of entered values.
Call of the menu by MENU 18 .
20 and
23 . The menu item is
Choice of menu item with
18
or branch to the next menu level.
opened with MENU
20 and
23 .
Selection of parameters shown with
Acceptance of parameters changed with MENU 18 . If the menu
is left, the instrument will return to the last measurement
function.
19 ESC
Leaving the menu. Return to the last measuring function
without acceptance of the value entered.
20
Rotating menu prompting. Jump to the next menu item with
every key operation. On reaching the last menu item the display
continues with the first menu item.
structure
STOP
1:Filter
Selection of the number of values taken for averaging. In case
of selection of a number greater than 1, the selected number
will be taken for averaging. By calculating a new averaged
value, the first measured value will be discarded and the mean
value will be computed.
OFF
2
4
8
16
(default setting after switch-on)
2:Temp
In this menu item the dimension for the temperature measurement is selected.
°C
Degrees Celsius
°F
Degrees Fahrenheit
The dimensions selected last will be saved even if the mains
will be turned off.
23
Rotating menu prompting. Jump to the previous menu item
with every key operation. On reaching the first menu item the
display will roll over and continue with the last menu item.
22 ENTER
Use this button only in the logger menu „6:Logger.“ Switching
to the next buffered value by every key operation or acceptance
of an input.
Menu structure and function
The menu will be accessed by pressing MENU 18 . It branches
to the submenues described below.
0:Time
The time intervals between the measurements are adjustable
from 0.01 s to 60 s. That means, a reading is taken every 0.01 s
or only every 60 s.
The sampling rate can assume the following values:
10 ms
(only via interface)
50 ms
(only via interface)
100 ms
(default setting after switch-on)
500 ms
1s
10 s
60 s
3: Sensor
Here the temperature sensor used is selected.
After switch on of the HM8112-3 and selection of the menu item
“3:Sensor“, if a measurement function other than temperature
measurement was set, PT 100 as temperature sensor is selected
by default. If the thermocouple is chosen the HM8112-3 is in
measurement function 15 ϑTH.
Also the instrument will return to the measurement function
13 ϑPT after selection of the PT-sensor. The sensor type
selected last will be stored in the instrument even if the main
voltage is turned off.
–
–
–
–
K–type: thermocouples NiCr-Ni (default setting after
switch-on)
J–type: thermocouples Fe-CuNi
PT1000: platinum resistance sensor with R0 = 1000 Ω
PT100: platinum resistance sensor with R0 = 100 Ω (default
setting after switch-on)
Comp
For measurements with thermocouples a reference with a
known temperature must be defined. This reference temperature is provided to the HM8112-3. Therfore 3 methods are
possible:
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Subject to change without notice
43
Menu
structure
Overview of menu structure – part 1
Call of the menu by:
MENU
¬
Selection of menu with:
¬
Opening menu with:
¬
Choose parameter:
¬
Assuming parameter
and closing the menu:
Special function in the
Logger-Menu
ENTER
see next page
MENU
MENU
Selection of sampling rate
default
0: Time
¬
MENU
¬
60s
10s
1s
500ms
100ms
¬
MENU
default
Filter: Number of values for averaging
1: Filter
¬
MENU
¬
16
8
4
2
Off
¬
MENU
default
Temperature: Selection of dimension
2: Temp
¬
MENU
¬
°F
°C
¬
MENU
last setting
Choice temperature sensor (PT100 / PT100, Fe - CuNi, NiCr - Ni)
3: Sensor
¬
MENU
¬
¬
K
J
PT1000
PT100
Comp
¬
MENU
default
Fixing the reference for the thermocouple
Comp
¬
MENU
¬
Comp Ext/Ice
Comp PT-Front
Comp 23°C/°F
Specification of an external ice bath, PT sensor or 23 °C as reference
Comp PT-Front
¬
MENU
Using a PT sensor for reference point
measurement
¬
νPT
¬
Selection of
2- or 4-wire measurement
¬
MENU
MENU
Acceptance of the displayed value
for reference
General information
Selection
4: Info
44
¬
MENU
Subject to change without notice
¬
Version
Cal Date
Ser-Nr
Display
default
¬
MENU
Version 070404
CalL Date 170504
Ser-Nr 00007104
Menu
structure
Overview of menu structure – part 2
Math-Menu
¬
5: Math
MENU
¬
Off
Lo Limit
Hi Limit
Offset
¬
MENU
default
Starting / Stopping the data logger, dumping the test series
¬
6: LOGGER
MENU
¬
¬
Start
Stop
Dump
¬
Dump
MENU
¬
00000
¬
ENTER
Dumping the test series
ENTER
ENTER
ENTER
¬
default
¬
¬
¬
¬
MENU
or
Rs19200
Rs9600
Off
last setting
by
MENU
Wert1 00001
Wert2 00002
Wertn 0000n
Storage End
ESC
leaving menu
Interface RS-232: selecting the baud rate
¬
7: Com
MENU
¬
¬
MENU
Calibration
8: Cal
This area is protected by password
Scanner, choice of the channel
9: Mux
¬
MENU
¬
empty
Chanal 1
....
Chanal 8
1st: Comp Ext/Ice
An external temperature test point acts as a reference, e.g. an
ice bath or another reference thermocouple with a temperature
of 0° C, connected with the closed end to the measuring point,
and the reference put into the ice bath. The closed end of the
thermocouples can be connected with standard measurement
cables to the terminals of the HM8112-3.
2nd: Comp PT-Front
The temperature measured with a platinum sensor is the
reference for the measurement used with the thermocouples.
If several thermocouples will be attached to the HM8112-3 via
a scanner, the use of the ice bath would be necessary for each
thermocouple. To overcome this, the ambient temperature or
even a source with a constant temperature is taken as the
reference (e.g. ice bath, heated reference). If “PT-Front“ is
seleced by pressing MENU 18 the function ϑPT will be
activated. Now 2- or 4-wire measurement can be chosen. Then
¬
MENU
default
the reference temperature is measured with a platinum sensor
and assumed by confirmation with button MENU 18 . In case
of 2-wire measurement the PT-sensor can stay connected to
the thermocouple. For 4-wire measurement it has to be disconnected and replaced by the connection of the thermocouple.
3rd: Comp 23° C/ °F
A temperature of 23° C is specified as reference. For measurements of high temperatures the resulting measurement error
can be neglected, unless the open end of the thermocouple is
on the level of the ambient temperature. The ambient temperature should be about 23° C.
4:Info
In this menu item all instrument information is available:
Version:
Display of revision number of the software
Ser-Nr:
Display of the intrument’s serial number
Cal date:
Display of the date of the last calibration.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Subject to change without notice
45
Measurement
inputs
5: Mathematics
Analysis of different characteristics of the measured values
OFF
The menu item 5:Math is off.
Lo Limit
Lower limit.
If the measured value is smaller than the Lo
Limit value an acoustic warning sounds and “Lo
limit“ is displayed.
Hi Limit
Higher limit.
If the measured value is greater than Hi Limit
value an acoustic warning occurs and „Hi limit“
is displayed.
Offset
An offset value can be set for all measurement
to 15
functions
a) Apply the offset value to the terminals.
b) Choose menu item 5:Math.
23 .
c) Select submenu „Offset“ by pressing
d) Open the submenu with MENU 18 , the
offset value applied will be displayed.
e) Accept the offset by pressing MENU 18 .
f) Return to measurement function, the display
shows 0,00…., , the dimension and „Os“.
g) Now you can connect the value to be
measured. It is compared the calibrated value
and the deviation is displayed.
In order to delete the stored offset:
a) Choose menu item 5:Math.
23 .
b) Select submenu „Off“ by pressing
c) Accept by pressing MENU 18 , return to
measurement function, the measured value is
displayed without offset.
or
d) select another measurement function.
The offset value will not be stored when the
measurement function is changed.
8:Cal
This menu is saved by password. In order to guarantee exact
measurements the HM8112-3 is calibrated. Calibration may
only be done with adequate precision reference sources. For
this purpose the password can be orderd at HAMEG GmbH
(Tel.: 06182-800-500 or via E-Mail: [email protected] de).
Attention:
After receiving the password any warranty claims of HAMEG
GmbH concerning the compliance with the technical specifications of the instrument become void.
9:Mux
For the future implementation of a scanner/test point switch.
Measurement inputs
For connection measurement signals the HM8112-3 features
4 safety connectors on the front panel. Depending on the
measurement function chosen, the active terminals will be
illuminated.
27
6:Logger
Analysis of different characteristics of the measured values
Start
The test series is started. According to the
selected sampling rate in „0:Time“ every xx
second a reading is taken and stored.
Stop
The test series is stopped.
Dump
The test series is shown on the display. Each
time button ENTER 22 is pressed the next value
of the stored test series is displayed.
7:COM
In this menu the baud rate can be chosen. Either 9600 baud or
19200 baud are available. The remaining interface parameters
cannot be changed.
Interface parameters (adjustable)
Rs Off
The interface is switched off
Rs19200
19,200 baud
Rs9600
9,600 baud
Interface parameters (not selectable)
N
no parity bit
8
8 data bits
1
1 stop bit
Xon-Xoff
Xon-Xoff
Every transmission of a character takes 1 ms.
Selecting a sampling rate of 0.01 sec requires a
baud rate of 19 200.
46 Subject to change without notice
STOP
24
25
26
The terminals on the front panel are safety connectors and the regulations have to be observed.
STOP
If connecting dangerous voltages to the input
terminals 24 and 26 all relevant safety regulations
are to be observed.
DC voltage must be floating!
AC voltage must be floating by use of a safety
isolating transformer.
Attention!
Voltages exceeding one of the following values are
regarded potentially dangerous or even lethal:
1st 30 Vrms
2nd 42.4 Vpeak
3rd 60 VDC
Connecting higher voltages than those is only
allowed to skilled personnel who are familiar with
the dangers incurred. The relevant safety
regulations are to be strictly observed!
Serial
24 V/SENSE (4mm safety sockets)
Connection of measuring cables for:
– voltage measurement
– frequency measurement
– 4 wire resistance measurement (SENSE)
– continuity test
– temperature measurement by a thermocouple
– 4 wire temperature measurement by a P–temperature
sensor (SENSE)
interface
disconnected. The cover of the fuse holder has to be turned
ccw with a screw driver having a suitable blade. As the cover
can be turned it has to be pushed by the srew driver into the
fuse holder. The cover with the fuse can then be easily taken
out. Replace the defective fuse by a new fuse of the same type
having the same trip current. A repair of a damaged fuse or
the use of other means for bypassing the fuse is very dangerous
and absolutely prohibited! Damages incurred will void the
warranty.
The maximum voltage between HI and LO case
(ground) must not exceed 850 V-peak or 600 VDC.
28 Power receptacle with power switch
Power receptacle for connecting the line cord with according
to DIN49457.
The maximum voltage between LO and case
(ground) may not exceed 250 Vrms!
29 Serial Interface RS-232
The RS-232 interface is on the rear panel of the HM8112-3
(9-pin D-sub socket). The bidirectional interface of HM8112-3
can receive data (commands) from an external device (PC) or
send data (measurement values and parameters).
26 A/SOURCE (4mm safety socket)
Connection of measuring cables for:
– current measurement, max. 1 ampere
– 2 wire resistance measurement
– 4 wire resistance measurement (SOURCE)
– 4 wire temperature measurement by a PT – temperature
sensor (SOURCE)
– continuity test up to 10 Ω
30 Voltage selctor
Choice of mains voltage (115 V / 230 V).
Serial Interface
STOP
The maximum current may amount to 1 Aeff!
The serial interface is electrically isolated from the measuring
circuit (Options: USB, IEEE-488).
25
LOW (4mm safety connectors)
Ground connection for inputs 24 and
high-impedance DC-isolated.
26
. Both connectors are
27 Fuse in the current measuring circuit
The shunt is fuse-protected. The fuse (FF) is located in a fuse
holder. The measuring circuit is designed for a maximum
allowable measurement current of 1 ampere.
Replacement of the fuse is only allowed, after the
instrument was disconnected from the mains!
A repair of a defective fuse or bypassing the fuse is
very dangerous and absolutely prohibited!
Replacement of the measuring circuit fuse
STOPmeasuring circuit fuse 27 is accessible from the front
The
panel. A replacement of the fuse is only allowed, if no voltage
is applied to the measuring connectors! Therefore all terminals
V/SENSE 24 , ground 25 and A/SOURCE 26 should be
The instrument is programmable by a PC
Functions and ranges can be selected and measurement
values stored in the instrument can be read out.
The HM8112-3 is connected to another instrument
by a 1:1 interface cable. It is recommended to use
a 9 to 25 pin standard adapter if a PC with a 25 pin
COM port isconnected.
HINT
Interface parameters
Settings:
No parity bit, 8 data bits, one stop bit, Xon-Xoff
Baudrate:
The communication is carried out with 9600
baud or 19200 baud.
29
28
30
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Subject to change without notice
47
Listing
of
commands
Data communication
Layout of commands
A command consists of 5 ASCII characters:
1.
2.
3.
4.
5.
Character: 0
Character: Command category (0, 1, 2 or E)
Character: Function between 0 and F
Character: Parameter between 0 and F
Character: Terminator, either CR or LF
–
–
all commands end with CR or LF
the character set includes figures 0 – 9, characters A – F
and CR, LF
the characters can be entered as upper case or lower case
letters
Figures 2, 3 and 4 received after 0 are interpreted as a
control command. After a command has been transmitted
a delay of at least 35 ms must be observed, then the next
command can be sent.
A transmission of invalid commands is answered with
2D0LF in case of wrong length of the command or void
command category, with 2D1LF for group 1, with 2D2LF
for group 2 and with 2DELF for group E. This helps
debugging the controller program. The error message is
transmitted immediately after occurrence.
–
–
–
Notes concerning some commands:
0000…0004 Measurement of DC voltage, ranges 100 mV to
600 V
0010…0014 True RMS with DC
0016…0019 True RMS without DC
02C3…02C5 This message is sent after a change of function
or range
02F0…02F3 Request of the instrument’s data
HINT By pressing button „LOCAL“ the instrument
returns to manual mode.
48
Subject to change without notice
2nd
FAX 781.665.0780 - TestEquipmentDepot.com
0
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
0,1mA
100Ohm
3 IAC
4 OHM 2WIRE
-
-
-
-
D Sensor RTD 2WIRE
E Sensor RTD 4WIRE
F Sensor TH
-
2 Com RS232
Subject to change without notice
F DATA WRITE
3 Cal - Reference value
-
XXXXXXX
LENGTH
REVISION
F Info - data read
-
OFF
D ERROR
C MESSAGE
-
EXT/ICE
F TEST
C Sensor Comp
A BUFFER
-
OFF
9 Logger
B RECORD NR.
-
STOP
8 Temp
-
7 Measurement mode
OFF
AUTO
4 Math
CONT
6 TRIGGER
3 Filter
1 MEAS-Time
OFF
-
B Diode test
C Continuity
0 AUTO-RANGE
-
8 FREQ/PERIOD VAC
100Ohm
0,1mA
2 IDC
5 OHM 4WIRE
100mV-DC
1 VAC
0
100mV
0 VDC
Function
3rd Character
1
-
Password
LAST CAL
GROUP 1
-
-
RAM
23°C
1
ON
START
-
ZERO
SINGLE
OFFSET
2
10ms
ON
J
-
-
-
-
FREQ
1kOhm
1kOhm
1mA
1mA
1V-DC
1V
2
-
SER NUM
GROUP 2
STATE DUMP
-
-
FRONT
2
DUMP
DUMP
-
CAL
-
HIGH LIMIT
4
50ms
-
K
-
-
-
-
PERIOD
10kOhm
10kOhm
10mA
10mA
10V-DC
10V
LEAD RES
LEAD RES
-
STATE OFF
9600
-
-
3
SINGLE DUMP
SINGLE DUMP
-
-
-
LOW LIMIT
8
100ms
-
-
Pt100
Pt100
-
-
-
100kOhm
100kOhm
100mA
100mA
100V-DC
100V
3
-
-
-
AUTO STATE
19200
RAM GOOD
-
4
CLEAR
CLEAR
°C
-
-
-
16
500ms
-
-
-
-
-
-
-
1MOhm
1MOhm
1A
1A
600V-DC
600V
4
-
-
-
CONT STATE
-
RAM FAIL
-
5
AUTO CLEAR
REC. END
°F
-
-
-
-
1s
-
-
Pt1000
Pt1000
-
-
-
10MOhm
10MOhm
-
-
-
-
5
4th Character PARAMETER
-
-
-
-
-
-
1V-AC
-
6
-
-
-
-
-
-
-
6
BUF. EMPTY
REC. EMPTY
-
-
-
-
-
10s
-
-
-
-
10 Ohm
Survey of the commands for HM8112-3
-
-
-
-
-
-
-
8
-
STOR FULL
-
-
-
MAX
-
60s
-
-
-
-
-
-
-
-
-
-
-
10V-AC
-
7
-
-
--> E
-
-
-
-
-->
-
-
-
-
-
MIN
-
UP
UP
-
-
-
-
-
-
-
-
-
-
100V-AC
-
8
9
-
-
GROUP E
-
-
-
-
F
-
-
-
-
-
-
-
DOWN
DOWN
-
-
-
-
No Change
-
No Change
No Change
No Change
No Change
600V-AC
No Change
LF
or
CR
Character
5th
of
E
2
1
0
Character Type
1st
The commands have to be transmitted as characters or a numeric string in ASCII format. Characters may be lower or upper key. Each command must use CR (Chr (13) corresponds 0x0D)
or LF (Chr (10) corresponds 0x0A) as its end.
Listing of commands
Listing
commands
49

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