Zero Adjustment Procedure
Please perform a zero calibration before each use. This will ensure the highest accuracy.
Note:
If the meter is used for a long period of time, temperature change and battery power
loss may cause the zero calibration to drift. For continued precision measurement, the
meter’s zero calibration should be readjusted.
1. Set the ACC/VEL switch to the ACC (Acceleration) position.
2. Insure that there is no signal present at the vibration sensor.
3. Remove the protective rubber holster and open the battery cover (described below).
4. Use a screwdriver to adjust the “Zero
adjust VR5”
potentiometer until the display
reads 0000.
Rear View of 407850
Battery Compartment
VR5
Data Hold
To freeze the LCD display, press the HOLD key. The 'D.H.' hold icon will appear at the top
of the LCD. Press the HOLD key again to return to normal operation (the 'D.H.' hold icon
will switch off).
MIN / MAX RECORD / RECALL Modes
To begin capturing the Minimum (MIN) and Maximum (MAX) vibration values, press the
RECORD key (‘REC’ will appear on the LCD). After taking measurements in the RECORD
mode, press the RECALL button. ‘MAX’ will appear on the display along with the highest
reading recorded since the RECORD button was pressed. Press the RECALL button again
to view the lowest reading (‘MIN’ will appear on the display). To return to normal operation,
press the RECORD button. ‘REC’ will switch off indicating that the meter has returned to
the normal mode.
RS-232 Serial PC Interface
The meter is equipped with an RS-232 serial data port (located at the top of the meter next
to the probe input jack). This interface was designed to operate with the Extech Data
Acquisition Software (PN 407001) and enables the user to capture, store and display
readings on a PC. For more information, contact Extech or refer to the 407001 user
manual for details.
4
Model 407850 Version 1.2 December 2005
EXTECH [ EXTECH INSTRUMENTS CORPORATION. ]
