sis equipment can be connected. In general, the DC output (direct current output) is used for long-
term monitoring with, for example, data loggers or data plotters.
Across the DC output a DC signal is applied, which is proportional to the measurement values. It
equals minus 0.5 mV per digit. That would, for example, translate into minus 1 Volt at a maximum
reading "2000 nT/Vm" or "200 nT/Vm". The negative signal was preferred over the positive signal
because it clearly offered better linearity and correspondence with the display value. Most analy-
sis instruments can internally convert the input signal into the appropriate absolute value. If this is
not the case, simply reverse the polarity of the plug of the analysis instrument in order to display
positive values. When using the BNC adapter, the shielding of the testing lead is connected to
mass potential. Even though the maximum values of the display show either 2000 nT or 2000 V/m,
the DC signal at the DC output is actually still quite linear up to 5000 nT or 5000 V/m, respective-
ly. The technical specifications of the field meter refer to the values shown as maximum values on
the display. As long as a jack plug is plugged into the DC socket, the "Auto-Power-Off" function
is deactivated in order to accommodate long-term data logging.
Caution: If during data logging the battery runs so low that "low Batt." is displayed, the "Auto-
Power-Off" function will be activated in order to prevent the battery from becoming completely
discharged, which otherwise might destroy the rechargeable battery.
24-hour data logging can be supported through a connection to the electric power system via the
adapter or a 12 V battery. In the event a power outage occurs during data logging, the recharge-
able battery in the instrument will take over automatically. As soon as electric power comes back
on, the instrument will automatically switch back to the adapter. Place the adapter as far away
from the field meter as possible in order to keep the detection of its emissions as low as possible.
By making note of the field strength with and without having the adapter plugged into the outlet,
it is possible to calculate the correction value, which of course should be subtracted from the total
measurement values.
Changing Batteries
Opening the Case
Turn off the field meter and disconnect all extension cords plug-
ged into it. Having the labeled side facing up toward you, hold the
field meter in your hand or put it down on a table.
Use the supplied wedge to open the case.
Picture 23
1.While opening the case, hold the instrument firmly in one hand
and with the other insert the wedge into the notch on the side,
about 1 cm (1/2") below the upper corner, and press the wedge
down on its thick end. There the lid will then lift slightly. Picture 23.
Picture 24
16
© by
GIGAHERTZ SOLUTIONS
®
GmbH, 90579 Langenzenn, www.gigahertz-solutions.com
Measurement Instructions
GIGAHERTZ
SOLUTIONS
R
