ML248xA / ML249xA Assembly and Connections
3-12 13000-00162
September 2005
Power Requirements
The ML248xA / ML249xA Power Meter is operated from an AC power line. The Power
Meter is intended as an Installation (Overvoltage) Category II, Insulation Category I device.
At power-on, the power meter will perform a brief power-on self test (POST). If a POST
error occurs, information and available options will be displayed on the screen. If the
POST is successful, the instrument will load the last used configuration.
Note: If “Secure” mode has been enabled, certain stored values will be cleared when the
instrument is switched on.
AC Line Power
The ML248xA / ML249xA Power Meter can operate on AC input power of 85-264V, 47-
440 Hz, 80 VA maximum. The Power Meter automatically configures itself for the voltage
applied. The AC line input is protected by an internal fuse.
Fuses
The AC input lines are protected by an internally mounted fuse. This fuse should only be
changed by qualified service personnel. Replace only with a fuse of the same type and
rating (AC fuse, 2A, 250V, slow-blow).
Grounding
The ML248xA / ML249xA 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.
Environmental Requirements
The ML248xA / ML249xA Power Meter is designed to operate within the temperature
range of 0 to 50 degrees C (32 to 122 degrees F) with a maximum humidity of 90% at 40
degrees C (104 degrees F), non-condensing. Full accuracy is dependent upon the sensor
specification. Refer to the sensor manual for details.
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