FLIR DM166 USER MANUAL       Document Identifier: DM166-en-US_AA 
Short press to toggle VFD on/off in AC Voltage mode or to toggle functions at 
a two-function switch position. Long press to view Frequency (Hz) in AC 
modes. Short press to step through AC/DC mV, and temperature when the 
function switch is set to the mV/Temp position. See Section 4.3.1, MODE 
Button Sequence of Operations. 
From Auto range mode, short press to select Manual range mode. 
In Manual mode, short press to change range; long press to return to Auto 
range. 
In thermal image mode, short press to select a color palette. 
Long press to open the emissivity adjustment menu, then short press to select 
emissivity value and long press to exit. 
Short press to enable/disable Relative mode. 
Short press to activate the Thermal Imager. Short press again to clear image 
of all text/icons. Short press a third time to exit the Thermal Imager mode. 
Press and hold to activate laser pointer. Release button to deactivate. 
Short press to switch ON/OFF the MIN-MAX-AVG display. 
Long press to open the Auto Power OFF (APO) settings menu, then short press 
to select APO time and long press to exit. 
Short press freezes/unfreezes display (DMM or thermal image mode). 
Long press toggles 
o
C and 
o
F temperature units in Thermal Image mode only. 
 
4.3.1 MODE/Hz Button Sequence of Operations 
 
MODE/Hz button sequence of operations 
ACA < > Frequency (long button press) 
ACV < > Frequency (long press) 
AC mV > DC mV > °C > °F (short press) 
AC mV < > Frequency (long press) 
Resistance < > Continuity (short press) 
Capacitance < > Diode (short press) 
ACµA < > DCµA (short press) 
AC < > DC (short press); ACA/ACmA < > Frequency (long press)