The First and Most Important Question To Ask is “Do you Only Want to Check RPM?” If the answer is “yes” then maybe you should buy an Optical Tachometer instead.
If your user cannot shutdown the rotating equipment to attach a piece of reflective tape for the Tachometer, then they must use a Stroboscope to read RPM while the device is running.
Many times users want to “Stop or Freeze” the motion for Diagnostic Inspection with a Stroboscope to view what is happening at that particular RPM or Flashes Per Minute (FPM).
Checking RPM of a rotating device with a Stroboscope is more complicated and takes practice as compared to using an Optical Tachometer. A Stroboscope will give the user more than (1) “stop motion” RPM readings and these are called “harmonics”.Harmonics are multiple single, double, triple, etc. “Stopped Motion Images” at various RPM or FPM settings.
Does Application Require“Contact” Tachometerto Read in RPM or Linear Speeds Such As a Conveyor Belt or
Elevator Speed in Inches per Minute, Feet per Minute or Meters per Minute?
Does your tachometer application require a portable“hand‐held” or “panel/bench top” model? What RPM range do you need to measure? What are the most popular tachometers and sensors? Does application require a remote optical sensor handheld or mounted in remote location? What input power is available to power the tachometer?
2. REFLECTIVE TAPE TARGET – Tachometers/Sensors must be used with the same reflective tape as
originally supplied. The reflective tape must be located on a radial line
on the flat end of the shaft or less than 30% of the circumference when located
on the side of the rotating shaft to obtain only one pulse per revolution. The
infrared (IRS) sensor and Smart Laser Sensor (SLS) models can also be targeted
from contrasting colors or bolt heads in certain applications.
3. ON TARGET INDICATOR ‐ The Tachometer/Sensor
must be held steady or mounted so the “on target indicator” locks on and does
not blink on and off while trying to take a measurement. The “on target
indicator” on all hand held tachs is a bull’s eye circle on the left side of
the display. The “on target indicator” on ROS, IRS and Laser sensors is a green
4. OPERATING DISTANCE AND ANGLE ‐ Tachometers with
white light optics operate 30 inches +/‐ 30 degrees. The red LED optics
operates up to 36 inches +/‐ 45 degrees. Pocket Laser Tachs operate up to
25 feet and the Smart Laser Sensor to 65 feet from T‐5 tape.
1. Press and hold “on button” then view light ( Red LED or Laser) at lens end of Tachometer/Sensor. The light must be visible except on the IRS models. NOTE: Do not shine LED or Laser into your eyes. 2. Aim Tachometer or Sensor at a fluorescent light from a distance of at least 3 feet and up to 20 feet away from a 4‐foot lamp. The correct reading must be 7200 ± 2 (60 cps x 60 sec x 2 = 7200). For 50 Hz. the reading will be 6000 ± 2. Tachometer calibration cannot change and there is no internal adjustment possible or necessary with the instrument.
Data Chart 1250 and 2000 paperless recorders utilize the FAT file system and thus, are limited to CompactFlash™ cards with a
maximum capacity of 2 Gigabytes or less.
Following is a simple procedure for partitioning a larger CF card for use in either of
This procedure must be run on a computer running Vista or Windows 7 (32-bit or 64-bit); Windows XP cannot access the
CF card properly.