Extech 461895 Operating Manual

INSTRUCTION MANUAL

English / Espanola

Model 461895

COMBINATION CONTACT/PHOTO TACHOMETER

1. INTRODUCTION

Congratulations on your purchase of Extech's Combination Contact/Photo Tachometer,
Model 461895. The combination tachometer is a patented design providing contact and
non-contact RPM measurements. In addition, linear surface speeds can be measured in
ft/min. or m/min.

Features

• Use of an exclusive micro-computer LSI-circuit and crystal time base offers high 0.05%
accuracy and fast measuring time

• RPM measurements span wide ranges: 5 to 99,999 RPM for photo tachometer and 0.5
to 20,000 RPM for contact tachometer

• Suppression of insignificant zeroes in large, 5 digit LCD display provides exact RPM
while saving battery power

• Last value and last max/min readings can be automatically stored and recalled

2. SPECIFICATIONS

2-1 General Specifications

Circuit Custom one-chip LSI microprocessor circuit.

Time base Quartz crystal

Display 5 digit, 10 mm (0.4") LCD display with function annunciation

Measurement Photo Tachometer - 5 to 99,999 rpm

Contact Tachometer - 0.5 to 19,999 rpm

Surface Speed - 0.2 to 6,560 ft/min

Surface Speed - 0.05 to 1,999 m/min

Memory Last value, last max. reading, last min. reading

Sampling Time Photo Tachometer - 1 sec. (over 60 rpm)

Contact Tachometer - 1 sec. (over 6 rpm)

Detecting Distance ­Photo Tachometer

Operating Temperature 32 °F to 122 °F (0 °C to 50 °C)

Power Supply 4x 1.5 V AA (UM 3) batteries

Weight 0.66 lbs. / 300g (including battery)

Size 8.5 x 2.6 x1.5” (215 x 65 x 38mm)

Accessories

2-2 Electrical Specifications

Measurement Range Resolution Accuracy (% rdg)
Photo
Tachometer
Contact
Tachometer
Surface
Speed
Surface
Speed

3. FRONT PANEL DESCRIPTION

5 to 99,999 rpm 0.1 rpm (0.5 to 999.9 rpm)

0.05 to 19,999 rpm 0.1 rpm (0.5 to 999.9 rpm)

0.2 to 6560 ft/min 0.1 ft/min (0.1 to 999.9 ft/min)

0.05 to 1999.9
m/min

3-1 Reflective tape

3-2 Signal light beam

3-3 Monitor indicator

3-4 Display

3-5 Measure button

3-6 Memory button

3-7 Function switch

3-8 Rotating ring

3-9 Circumferential speed ring

3-10 Battery compartment

50 to 150 mm (2 to 6 inches) depending on ambient light

Reflective tape (23"), cone and funnel rpm adaptor, surface
speed test wheel, and carrying case

+

1 rpm (over 1000 rpm)

1 rpm (over 1000 rpm)

1 ft/min (over 1000 ft/min)

0.01 m/min (0.05 to 99.99 m/min)

0.1 m/min (over 100 m/min)

3-1
3-2

3-3
3-4

3-6

3-7

3-8

3-9

(0.05% + 1 digit)

± (1% rdg + 1d)

3-5

3-10

2

461895 V1.8 August 2001