FLIR CM4x - GETTING STARTED Document Identifier: CM4x-QS-mul_AA
Additional Features and Functions
Relative (CM44) and DC Zero (CM46)
DC ZERO: To offset a non-zero DCA residual signal caused by magnetic hysteresis of the jaws (for DCA and DC+ACA functions), short press the
ZERO button to activate/re-activate. For best accuracy, apply this technique before making any single DCA or DC+ACA measurement. The
meter displays “dc_0”briefly to confirm activation. The meter emits 3 beeps if the residual is beyond a reasonable hysteresis reading of ±5 DCA.
RELATIVE MODE: To access the Relative function, long press the button and the display icon will appear. The measurement value
displayed at the time the button is pressed will be stored by the meter as a reference value. Subsequent measurements made, while the
Relative mode is active, will be compared to the stored reference and the meter will display the difference between the stored reference and
the actual measurement. Long press the button to exit this mode and the display icon will switch off.
MIN/MAX/AVG Recording
In MIN/MAX/AVG record mode, the meter captures and displays the Minimum, Maximum, and Average readings and updates only when a
change in measurement value is registered. Auto Power OFF is disabled when MIN-MAX-AVG recording is enabled.
1. Short press the button to access the recording mode. The MAX, MIN, and AVG icon will appear indicating that the meter is now
recording.
2. Short press the button to step through the recorded MAX , MIN , and AVG values.
3. Long press the button to exit this mode. The icons will switch off. The meter will return to normal operation and the MAX, MIN, and AVG
memories will be reset.
VFD Mode (low pass filter)
The VFD feature eliminates high frequency noise in voltage measurements by means of a low-pass filter. The VFD mode is designed for variable
frequency drive measurements. This mode is always active for ACV and Hz measurements. The VFD display icon is displayed when active.
Display Hold Function
1. In Display Hold mode, the reading is held on the display.
2. Short press the H(HOLD) button to toggle the Display Hold function ON and OFF.
3. In Hold mode, the indicator is displayed.
Display Backlighting
A long press of the button activates/deactivates backlighting. The backlight switches off automatically after several seconds to conserve
battery energy.
PEAK Mode (CM44 and CM46)
A long press of the P (PEAK) button arms the Peak feature. The LCD icon is displayed when Peak mode is active. Peak mode captures inrush
current or voltage RMS values. The Peak measurement window is 80ms in duration. Auto-Power-Off is disabled automatically in this mode.
Long press P to switch the Peak mode OFF.
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