Environmental Requirements Installation
2-2 PN: 10585-00001 Rev. P ML2437A/38A OM/PM
Battery Power
The ML243xA Power Meter can be operated using the optional internal battery pack. During
battery operation, an icon is displayed on measurement screens indicating the state of charge.
When the remaining capacity reaches less than 10 %, the icon will flash, indicating that
charging will soon be required. When running from battery power, an estimate of typical-use
running time remaining can be viewed using the System menu. Note that, due to power
consumption considerations, GPIB and serial remote operation are not available when the
power meter is running from the battery.
The AUTO POWER OFF feature is also available through the System menu, and can be used
to automatically switch the unit to standby after a specified period of inactivity to save
battery power. The timer can be set for 10 to 240 minutes, and any key press will restart the
timer. This same feature will automatically switch the unit to standby when the battery is
fully discharged (in order to minimize the risk of over-discharge).
For optimum battery life, store the battery pack at -20 to +50 C (-4 to +122 F) for short
periods and -20 to +35 C (-4 to +95 F) for long term storage. The ML243xA Power Meter will
operate from AC or DC main power with this battery removed. This battery is not used for the
retention of nonvolatile memory functions. Refer to Battery Charging, Removal and
Replacement, for further information.
Fuses
The ML243xA Power Meter AC and DC input lines are protected by internally mounted fuses.
These fuses should only be changed by qualified service personnel. Replace only with fuses of
the same type and rating (AC fuse is 2 A, 250 V, slow-blow; DC fuse is 3 A, 125 V, slow-blow).
Grounding
The ML243xA Power Meter must be properly grounded. Failure to ground the instrument
could be hazardous to operating personnel. The meter is supplied with a three-conductor
power cord. The instrument is properly grounded during AC line operation when the plug is
connected to a properly installed three-prong receptacle. A grounding terminal is provided on
the rear panel to ground the unit during operation from a DC supply.
2-4 Environmental Requirements
The ML243xA Power Meter is designed to operate within the temperature range of 0 to 50 C
(32 to 122 F) with a maximum humidity of 90 % at 40 C (104 F), non-condensing. Full
accuracy is specified at 5 to 35 C (23 to 95 F). Although not recommended, operation in
temperatures to -20 C (-4 F) is possible. At these temperatures the liquid crystal display
may exhibit excessively slow response. The soft sided carry case (part number D41310) and
optional front panel cover (PN: 2000-1535) can be used to help retain internally generated
heat and may improve response.
Note
The ML243xA Power Meter uses a high-capacity Ni-MH battery. Over-discharge
can result in a permanent loss of battery capacity of as much as 20 %. If the unit is
to be stored for an extended period (longer than one week), remove the optional
battery pack so as to preclude over-discharge.
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