User's Guide
Digital Stroboscope Tachometer
Model 461830 and Model 461831
Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects
in parts and workmanship for one year from date of shipment (a six month limited
warranty applies on sensors and cables). If it should become necessary to return the
instrument for service during or beyond the warranty period, contact the Customer
Service Department at (781) 890-7440 ext. 210 for authorization or visit our website at
www.extech.com (click on ‘Contact Extech’ and go to ‘Service Department’ to request an
RA number). A Return Authorization (RA) number must be issued before any product is
returned to Extech. The sender is responsible for shipping charges, freight, insurance
and proper packaging to prevent damage in transit. This warranty does not apply to
defects resulting from action of the user such as misuse, improper wiring, operation
outside of specification, improper maintenance or repair, or unauthorized modification.
Extech specifically disclaims any implied warranties or merchantability or fitness for a
specific purpose and will not be liable for any direct, indirect, incidental or consequential
damages. Extech's total liability is limited to repair or replacement of the product. The
warranty set forth above is inclusive and no other warranty, whether written or oral, is
expressed or implied.
Introduction
Congratulations on your purchase of the Extech Digital Stroboscope Tachometer. This
device measures the speed of moving parts such as gears, fans, propellers, centrifuges,
and pumps. The stop-motion action of this instrument permits the visual inspection of
moving parts. Careful use of this instrument will provide years of reliable service.
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Model 461830/461831 Version 2.2 November 2003
Safety
This symbol, adjacent to another symbol or terminal, indicates the user must refer
to the manual for further information.
This symbol, adjacent to a terminal indicates that, under normal use, hazardous
voltages may be present
WARNING:
Do not look directly at the Strobe’s Xenon lamp or its reflector.
WARNING:
This device causes moving objects to appear still. Take precautions against
accidental contact with moving objects.
CAUTION:
Do not touch the flash tube.
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Model 461830/461831 Version 2.2 November 2003
Specifications
General Specifications
Circuit
Display
Measurement unit
Exclusive one-chip LSI circuit with crystal time base
4-digit (10,000 count; 0 to 9999) LED display
RPM (revolutions or rotations per minute) is the speed of the
moving device under test which equals the FPM rate (strobe
flashes per minute)
32 to 122 F (0 to 50 C)
< 80% RH
110VAC (461830) or 220VAC (461831) 50/60Hz ±10%
<25 watts @ 115V
2.2 lbs. (1kg)
8.3 x 4.8 x 4.8" (21 x 12 x 12cm)
Impact resistant plastic with plastic lens and mirrored reflectors
o
o
Operating Temperature
Operating Humidity
Power Supply
Power Consumption
Weight
Dimensions
Housing construction
Electrical Specifications
Measurement Range
Resolution
100 to 10,000 RPM/FPM
0.1 (<1000 RPM/FPM)
1 (1000 to 9999 RPM/FPM)
10 (10,000 RPM/FPM)
Accuracy
Sampling Time
Strobe Flash adjust range
Strobe Flash tube type
Strobe Flash duration
Strobe Flash Energy
Strobe Beam Angle
Strobe Flash Color
± (0.05% + 1 digits)
1 second
LOW: 100 to 1,000 RPM/FPM
HIGH: 1000 to 10,000 RPM/FPM
Xenon lamp
60 to 1000 microseconds
4 Watt-Seconds (Joules)
80
o
o
White 6500 K
Notes:
Replace the Xenon lamp when readings appear irregular. To prolong the Xenon lamp
life and ensure safe operation, please adhere to the following recommendations.
•
A 30-minute use limit < 3000rpm and 5-minute use limit > 3000rpm exists. Do not use
the instrument for periods longer than specified otherwise damage to the instrument
may result.
Always permit a 10-minute cool-down between cycles.
Do not touch the Xenon flash tube.
•
•
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Model 461830/461831 Version 2.2 November 2003
Meter Description
1.
2.
3.
4.
Xenon lamp
LED Display
Grip handle
COARSE adjust knob
5.
6.
7.
8.
FINE adjust knob
Power ON/OFF switch
Range Select Switch
AC power cord and jack
3
2
4
6
1
5
7
8
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Model 461830/461831 Version 2.2 November 2003
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