Communicating
Powering and Outputs on the EVM
EVM Series User Manual
Charging
The rechargeable battery pack is charged by plugging in the universal power adapter cord into the
charging-port and into an electrical outlet. When using the EVM and the power adapter, it will charge as
you use the instrument. The estimated time to recharge a fully discharged battery pack is approximately
five hours. It is important to understand that the USB connection/cable will not charge the internal
battery. USB is used for communication purposes only.
NOTE: When the batteries are depleted and if you are charging the instrument, the temperature
sensor will read at a higher level. Thus, it is recommended to measure the temperature
when you are not charging the instrument.
About the Environment
If the environment you are in is above 40º C (104º F) when charging the battery then you will be unable
to charge the battery. (See Appendix D for screen warnings.)
Outputs
The digital output and/or analog output can be used to connect to external devices such as a chart
recorder or a light notification device. The monitor’s digital out and analog out channel are accessible
through the Input/Output connector. The air velocity wand also uses this connector. (The following
diagram depicts the backside of the instrument without the back cover and the black rubber casing
removed.) For more information on connecting and using a stereo plug, see Appendix D.
Power jack
Analog & Digital Outputs
USB port
Figure 2-8: USB, power jack and digital output port
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