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Hand Tachometers |
| Model | DHM 904 | DHO 907 | DHO 907 Combi | Series 250 | Series 2000 |
| Indication | Digital | Digital | Digital | Mechanical | Mechanical |
| Contact/ Non-contact measurement |
Contact | Non-contact (Photo/optical sampling for distance up to 250mm) | Contact and Non-contact (Photo/ optical sampling for distance up to 250mm) | Contact | Contact |
| Measuring Principle and Measuring Time | Counting number of revolutions during 0.5 sec. to max. 6 sec and calculating speed by means of µP | Counting number of revolutions during 0.5 sec. to max. 6 sec and calculating speed by means of µP | Counting number of revolutions during 0.5 sec. to max. 6 sec and calculating speed by means of µP | Counting number of revolutions during a fixed time of 6 sec. resp.3 sec (Type 920) | Continuous measurement based on the eddy current measurement principle |
| Rugged Housing | Drop tested Polyamid 66 | Drop tested Polyamid 66 | Drop tested Polyamide 66 | Black anodized alloy | Shock proof plastic |
| Display | LCD, 5 digits | LCD, 5 digits | LCD, 5 digits | scale and pointer | scale and pointer |
| Battery operated/ Battery life |
Yes 120 hours |
Yes 120 hours |
Yes 120 hours |
No | No |
| Battery Low Indicator | Yes | Yes | Yes | n.a. | n.a. |
| Operation | Single button | Single button | Single button | Single button | Single button |
| Memory recall | last measured value | last measured value | last measured value | no | no |
| Self test | Yes | Yes | Yes | no | no |
| EMC: electrostatic: el.magn. field: |
Yes 8 kV 30 V/m |
Yes 8 kV 30 V/m |
Yes 8 kV 30 V/m |
Yes >16 kV >200 V/m |
Yes >16 kV >200 V/m |
| Weight incl. box and std. accessories | 500 g | 400 g | 500 g | 350 g | 700 g |
| Accuracy | 0.02 % of measured value ± 1 digit |
0.02 % of measured value ± 1 digit |
0.02 % of measured value ± 1 digit |
0.25 % of full scale |
0.5 % of full scale |
| Resolution resp. Readability | 1 digit | 1 digit | 1 digit | 3% of full scale | 0.5% of full scale |
| Wide Rotational speed range (rpm) | 10.00 - 99.99 100.0 - 999.9 1000 - 19999 |
10.00 - 99.99 100.0 - 999.9 1000 - 99999 |
10.00 - 99.99 100.0 - 999.9 1000 - 19999 optical: 99999 |
254: 0-100 252: 0-1000 253: 0-10000 251: 0-10000 |
2200: 0-200 2500: 0-500 |
| Wide linear metric speed range | switch set to metric: 1.50 - 99.99 m/min 100.0 - 999.9 m/min 1000 - 3048 m/min |
n.a. | switch set to metric: 1.50 - 99.99 m/min 100.0 - 999.9 m/min 1000 - 3048 m/min |
with metric disc 0.1m circumfer. and conversion factor x0.1: Type: m/min 254: 0-10 252: 0-100 253: 0-1000 251: 0-1000 |
with metric disc 0.1m circumfer. and conversion factor 0.1: Type: m/min 2200: 0-20 0-200 0-2000 2500: 0-50 0-500 0-5000 |
| Auto ranging | yes | yes | yes | no: conversion factor depends on disc dia. | no: conversion factor depends on disc dia. |
| Optical range | n.a. | 250mm - 30° | 250mm - 30° | n.a. | n.a. |
| Ambient Temperature | 0...+50°C | 0...+50°C | 0...+50°C | -10...+50°C | -10...+50°C |
| Carrying case - mm (l x w x h) |
220 x 150 x 42 | 220 x 150 x 42 | 220 x 150 x 42 | 130 x 90 x 35 | 160 x 110 x 60 |
| Standard Accessories | Carrying case 3 batteries 1 driver with large rubber tip 1 driver with small rubber tip 1 measuring wheel Operating instructions |
Carrying case 3 batteries 1 sheet with 30 self-adhesive reflective markers Operating Instructions |
Carrying case 3 batteries 1 driver with large rubber tip 1 driver with small rubber tip 1 measuring wheel 1 adapter 1 sheet of reflective markers Operating instructions |
Carrying case 1 driver with steel tricorn tip 1 driver with large rubber tip 1 driver with tapered female rubber tip 1 Measuring roller |
Carrying case 1 driver with large rubber tip 1 driver with small rubber tip 1 driver with tapered female rubber tip 1 Measuring roller |
| Warranty | 2 years | 2 years | 2 years | 2 years | 2 years |
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Amalgen Technologies Pty Ltd 43 Anderson Road, Mortdale NSW 2223 Australia Phone: +61 2 9570 2855 Fax: +61 2 9580 5128 |
| © 2007 All rights reserved. Amalgen Technologies Pty Ltd. |