Serial Interface - Hameg HM8112-3 Manual

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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-
The maximum voltage between LO and case
(ground) may not exceed 250 V
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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
–
The maximum current may amount to 1 A
STOP STOP
25
LOW (4mm safety connectors)
Ground connection for inputs
high-impedance DC-isolated.
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
STOP
The measuring circuit fuse
panel. A replacement of the fuse is only allowed, if no voltage
is applied to the measuring connectors! Therefore all terminals
24 25
V/SENSE , ground and A/SOURCE
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Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
or 600 V .
peak DC
!
rms
!
eff
24 26
and . Both connectors are
27
is accessible from the front
26
should be
S e r i a l
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.
28
Power receptacle with power switch
Power receptacle for connecting the line cord with according
to DIN49457.
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).
30
Voltage selctor
Choice of mains voltage (115 V / 230 V).

Serial Interface

The serial interface is electrically isolated from the measuring
circuit (Options: USB, IEEE-488).
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.
i n t e r f a c e
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47
Subject to change without notice