Monarch Instrument TACH-4AR - Manual (Page 3)

PREPARATION FOR USE
The TACH-4A is a multi-function instrument which can be utilized as a wide
range Tachometer, multi-funtion Totalizer/Counter, and a Timer (Stopwatch).
The scale mode allows the instrument to be used as a Ratemeter and to
scale in real engineering units for RPM and linear speed measurements.
The Totalizer mode has an independent scaling capability. The TACH-4A
has powerful internal optics while the TACH-4AR has identical internal
optics and the capability to operate with a Remote Optical Sensor,
Infrared Sensor, or Remote Laser Sensor.
TACH-4A measures RPM directly without contacting the rotating object. A
portion of the circumference of the rotating object is prepared by cleaning a
small area and applying Reflective Tape (T-5) approximately 1/2" square.
For small diameter shafts, a smaller reflective marker may be used on the
circumference, but in no application should the reflective marker cover more
than half the circumference of the shaft. Also, a measurement can be made
on the end of the shaft by applying a small piece of Reflective Tape (T-5)
along a radial line (slightly less than 1/2 of the shaft should be covered).
RANGE AND ACCURACY
TACH-4A measures rotational speed from 5 RPM to 500,000 RPM. The
decimal point can be programmed for fixed or floating operation to provide
the maximum resolution and accuracy for the speed being measured.
Below 10 RPM, when in the floating decimal mode, TACH-4A will read to
four decimal places. Above 100,000 RPM, the display reads to six digits.
CALIBRATION
The instrument is factory calibrated, traceable to NIST. The calibration
system complies with MIL-STD-45662A. The accuracy of the Tachometer
can be checked at any time by aiming it at an old style fluorescent light and
observing 7200 + 2 counts.
NOTE: In countries with a 50 Hz. power line frequency, the Tachometer
will read 6000 + 2 counts.
A N.I.S.T. (National Institute of Standards and Technology) Certificate of
Calibration is supplied with each instrument and is valid for 12 months.
SPECIFICATIONS
OPERATING MODESPush-button selectabe Menu: RPM
Scale, Total, Count, Timer, Decimal,
Point (Fixed or Floating), Backlight
(On-Off), Serial Number, Test
SPEED RANGE (RPM) 5.0 RPM to 500,000 RPM
Fixed Decimal or Auto-Ranging
N.I.S.T Calibration Certificate is supplied.
Range (RPM) Accuracy (RPM) Resolution
5.0000- 9.9999 ± 0.0001 0.0001
10.000-99.999 ±0.001 0.001
100.00-999.99 ±0.01 0.01
1000.0-9999.9 ±0.1 0.1
10,000-99,999 ±1.0 1.0
100,000-500,000 ±0.001% of the reading
FREQUENCY RANGE: 0.08 Hz to 10,000 Hz
DISPLAY: 6 digit alphanumeric 0.44 inch high
backlighted LCD updated twice per
second
INDICATORS: On Target, Low Battery, Mode, Max,
Min, Instrument “Locked On”, Scale
and Error
POWER: 4 “AA” Alkaline batteries.
Rechargeable NiCad batteries optional
SIZE: 6.2” x 3.74” x 1.3”
WEIGHT 14 oz.