Extech Instruments 461830 User Manual page 4

Meter Description
1. Xenon lamp
2. Display (LED)
3. Grip handle
4. COARSE adjustment knob
5. FINE adjustment knob
6. Power ON-OFF switch
7. Range select switch
8. AC power cord and jack
Operation
Powering the Instrument
1. Plug the supplied power cable into the instrument's power cable jack.
2. Plug the other end of the cable to the AC power source. The 461830 requires 110 V AC and the
461831 requires 220 V AC. Do not plug the device into the incorrect power source; damage to
the instrument will result.
3. Use the ON/OFF switch to switch the instrument ON/OFF.
Speed (RPM) Measurements
1. Remove power to the device under test so that it is stationary.
2. Affix a small piece of reflective tape (or otherwise create a mark) on the device under test.
3. Point the stroboscope's beam at the tape.
4. Use the 'FINE' and 'COARSE' adjustment knobs to synchronize or "stop" the motion of the mark
(read the 'Display Notes' section below).
5. Read the RPM value on the display.
Range Adjustments
1. While measuring, use the RANGE button to select the range.
2. The LOW range is used for measurements below 1,000 RPM. The HIGH range is used for
measurements above 1,000 RPM.
Visually Inspecting a Moving Object (stop-motion)
When the speed of the moving object matches the flash rate of the stroboscope, the moving object
appears still (motionless). Measure the speed of a moving object, as described in the previous
sections, to obtain stop-motion. Once stop-motion is achieved, the FINE adjust knob is used to vary
the viewing perspective of the object under test.
461830_461831_UM_en-US_v3.3 11/24
4