20
GMC-I Gossen-Metrawatt GmbH
Conclusion of Measurement and Discharging
➭
Briefly press the multifunction key
FUNC
.
After the measurement has been completed, any residual voltage is
displayed which may be caused by conductor capacitance. The
100 k
Ω
internal resistance provides for quick discharging. Contact
with the DUT must be maintained. The reduction in voltage can be
observed directly at the LCD.
Do not disconnect the DUT until voltage
has dropped to below 25 V!
Note!
The instrument’s batteries are rapidly depleted during
insulation resistance measurement. Deactivate insula-
tion resistance measurement between measurements.
Use only alkali-manganese batteries in accordance with
IEC 6 LR61.
15.1 Evaluation of Measurement Values
In order to assure that insulation resistance does not violate lower
limit values as prescribed by national requirements, the instrument’s
intrinsic and influence errors must be taken into consideration.
The minimum values for insulation resistance can be determined
with the table in chapter 14.4 which must be displayed under con-
sideration of maximum operating error for the METRA HIT 16 T
(under nominal conditions of use) in order to assure that the
required limit values are not violated.
16
RS232C Interface
The multimeters are equipped with an serial infrared interface for
the transmission of measurement data to computer systems. The
measurement values are optically transmitted through the housing
to an interface adapter via infrared light, which can be plugged onto
the multimeter. Data are then transmitted to the computer by
means of a RS232 cable.
Activating the Interface
➭
Press the
ON |OFF
and
DATA|MIN/MAX
keys simultaneously when
switching the instrument on.
After the interface has been activated, automatic shut-off is dis-
abled for the instrument. This is indicated at the LCD (1) with the
blinking
symbol
(8).
The “DATA” function cannot be activated.
Accessory Interface Packs
Interface adapters
without memory provide for the transmission of
measurement data from up to two multimeters to a PC.
Memory adapters
also allow for on-site storage of measurement data
without a PC, and stored data can be subsequently uploaded to a
PC. Up to 10 multimeters can be interconnected off-line for the
establishment of a high performance, multiple measuring system.
On-line connection of up to six multimeters to a PC via memory
adapters is also possible (single-channel memory pack or 4-chan-
nel memory pack).
All interface packs include adapters, connector cables and
“METRAwin 10” data logging and analysis software with operating
instructions.
