Maintenance And Calibration; Usage Of The Mulitmeter In Connection With A Personal Computer; Technical Data And Accuracy - Conrad M-4660A Bedienungsanleitung

Attention!
Never short the output of the signal generator, as the output terminal
and the meter could be destroyed. When the function "Signal-Out S/O"
is selected neither the voltage input terminal nor the current sockets
must be connected.
5.13 Usage of the Mulitmeter in connection with a
Personal Computer
a) Connection
Connect the enclosed RS-232 cable between the meter's RS-232
connector and the PC serial port, switch off your computer before
(see figure).
Now turn on your multimeter and your computer
b) The data format consists of a frame of 14 bytes. The frames are set
as follows:
BYTE 1 2 3 4 5 6 7 8 9 A B C D E
Example 1) D C - 3 . 9 9 9
Example 2) 3 . 9 9 9 Mo h m CR
30
W
O 1O 20 30 4O
V CR
Communication Specifications for Data-Transfer:
Transfer Rate . . . : 1200 Baud
Character Code . . : 7-bit ASCII
Parity . . . . . . . . . : None
Stop Bits . . . . . . . : 2

6. Maintenance and Calibration

Calibrate the meter once a year to maintain its accuracy over a longer
period of time. Fuse replacement is described in point 2. (Safety Rules).
Battery replacement is described in point 4.1.
Clean the unit and the display with a clean, lint-free, antistatic, dry, cloth.
Attention!
When cleaning the housing, do not use detergents containing hydrog-
carbons, petrol, alcohol or similar. These chemicals could damage the
surface of the measuring unit. Besides solvent vapors are dangerous to
your health and explosive.

7. Technical Data and Accuracy

7.1 Technical Data
Display . . . . . . . . . . . . . . . . : 4
maximum reading 19999 with automatic
polarity display
Max. Measuring Rate . . . . . : 2.5 measurements per second
Max. Input Current DC/AC . : 20 A
Operating Temperature . . . : 0° to +40°C
Storage Temperature . . . . . : -10°C to +50°C
Relative Humidity . . . . . . . . : 0° to 90 % (0° to 35°C)
0° to 70 % (35°C to 50°C)
Temperature Coefficient
for Guaranteed Accuracy . . : +23°C ± 5 K (= Kelvin)
1
/ -digit liquid cystal display (LCD),
2
31