Monarch Instrument TACH-4AR User Manual

MONARCH INSTRUMENT

Instruction Manual

TACH-4A / TACH-4AR

Programmable Optical T achometer

1071-4850-001
Rev 2.0

15 Columbia Drive • Amherst, NH 03031• E-Mail: [e-mail]

Phone: [phone] • Fax: [phone]

OVERVIEW

The TACH-4A has 6 control buttons. Several have more than one function.

POWER (LOCK) - Used to turn the instrument on, and in some cases off.
It is used to initiate the timer and counter operations and to control the
RPM measurement function.

RECALL (STORE) - Used to recall the maximum and minimum values in
RPM and SCALE modes, temporarily hold the display in the Totalize
mode, and “save” (store) new setups in the MENU mode.

RESET (LOCK) - Resets all stored measurements in all modes back to
zero. Holding RESET and pressing POWER on start-up “locks on” the unit
in RPM and Scale modes. RESET returns scale factor to “00001” from a
previously selected scale factor.

UP ARROW (!) - Advances Menu mode selections. Increments the value
of the selected digit when setting scale factors.

LEFT ARROW (") - Turns LCD back light on for 60 seconds in any mode.
Selects menu item options in menu mode. Selects the digit to be edited
when setting a scale factor.

MENU - Pressing MENU then POWER will shut the instrument off.
Pressing MENU then UP ARROW will enter the menu mode and display
the current Menu selection.

POWER ON/OFF

The unit can be powered up by pressing the POWER (LOCK) button. When
turning the unit on, it can be “locked on” by pressing and holding the
RESET (LOCK) button then pressing the POWER(LOCK) button. Locking
the unit on allows it to make continuous readings without holding the
POWER button.

When the unit is powered up, it will operate in the last mode selected prior
to turn off. The TACH-4A is shipped from the factory in the RPM mode.

The unit can be shut off in any mode by pressing the MENU button then
POWER button. When the Lock Chevron is not displayed and no button is
pressed for 60 seconds, the unit will automatically shut off.

SPECIFICATIONS

OPERATING MODES Push-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 Targe t, Low Battery, Mo de, 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.

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.