58
Subject to change without notice
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
functions
6
to
15
a) Apply the offset value to the terminals.
b) Choose menu item 5:Math.
c) Select submenu „Offset“ by pressing
23
.
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.
b) Select submenu „Off“ by pressing
23
.
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.
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. se-
lecting a sampling rate of 0.01 sec requires a baud
rate of 19 200.
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 (Phone.:
(+49) 06182-800-500 or via E-Mail: [email protected]).
s c a n n e r c a r d H o 1 1 2
Attention:
After receiving the password any warranty claims of HAmeg
GmbH concerning the compliance with the technical specifi-
cations of the instrument become void.
9:mux
For the future implementation of a scanner/test point switch.
10.8 measurement
inputs
For connection measurement signals the HM8112-3 features 4
safety connectors on the front panel. Depending on the measu-
rement function chosen, the active terminals will be illuminated.
the terminals on the front panel are safety con-
nec-tors and the regulations have to be observed.
if connecting dangerous voltages to the input termi-
nals
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 isola-
ting transformer.
Attention!
Voltages exceeding one of the following values are
regarded potentially dangerous or even lethal:
1
st
30 V
rms
2
nd
42.4 V
peak
3
rd
60 V
Dc
connecting higher voltages is only allowed by skilled
personnel who are familiar with the dangers incur-
red. the relevant safety regulations are to be strictly
observed!
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)
the maximum voltage between Hi and lo case
(ground) must not exceed 850 V-
peak
or 600 V
Dc
.
the maximum voltage between lo and case
(ground) may not exceed 250 V
rms
!
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
9
Änderungen vorbehalten
W i c h t i g e H i n w e i s e
B e z e i c h n u n g d e r B e d i e n e l e m e n t e
2 Bezeichnung der Bedienelemente
1
DisPlAy
– 16-stelliges Display
2
PoWer
– Stand-By / EIN
3
HolD DisPlAy
– angezeigter Wert im Diplay speichern
4
Zero
– Nullabgleich der Messstrecke
5
rm/locAl-taste
–
Fernbedienung über Interface ausschalten
6
V
Dc
– Gleichspannungs-Messung
7
A
Dc
– Gleichstrom-Messung
8
V
Ac
– Wechselspannungs-Messung mit AC-Kopplung
9
A
Ac
– Wechselstrom-Messung
10
V
Ac+Dc
– Wechselspannungs-Messung mit DC-Kopplung
11
Ω
– Widerstandsmessung, 2- und 4-Draht
12
FreQ./PerioD
– Frequenz und Periodendauer mit V
AC
13
δ
Pt
- Temperaturmessung mit PT-Messfühler,
2- und 4-Draht
14
- Dioden- / Durchgangsprüfung
15
δ
tH
– Temperaturmessung mit Thermoelement, 2-Draht
16
mAX
– maximaler Messwert während einer Messreihe
17
min
– minimaler Messwert während einer Messreihe
18
menu
– Auswahl Menüsystem, Übernahme von Menüpunkt
/ Parameter
19
esc
– Verlassen des Menüsystems ohne Werte zu überneh-
men
20
– Abwärts: Messbereichstaste und Scrollfunktion im
Menü
21
Auto
– Umschalten manuelle / automatische Messbe-
reichswahl
22
enter
– Sonderfunktion: Auswahl der Parameter im
Logger-Menü
23
– Aufwärts: Messbereichstaste und Scrollfunktion im
Menü
24
V sense
– Eingang für Spannungs-, Frequenz-, Wider-
stands-, Temperaturmessung
25
lo
– Bezugsmasse für Messung
26
A source
– Eingang für Strommessung
27
Fuse
– Messkreissicherung 1 A / 250 V (superflink)
geräterückseite
28
Kaltgeräteeinbaustecker
mit Netzschalter
29
usB/rs-232 schnittstelle
Option: HO880 IEEE-488 (GPIB), eingebauter Messstellen-
umschalter im HM8112-3S
30
netzspannungswahlschalter
(115 V bzw. 230 V)
1
2
27
3 4 5
6
7
8
9
10 11 12 13 14 15
16 17
19 20 18 21 22 23
24
25
26
29
28
30
