Velleman DTO2234 User manual

DTO2234 Digital Photo Tachometer
User Manuel
Gebruikershandleiding
Manuel d’Utilisation

DTO2234 GB1
1.FEATURES
•Measuring RPM is safe & accurate without attachment to object.
•Wide measuring range & high resolution
•Digital display gives exact RPM with no guessing or errors.
•Uses the exclusive MICRO-COMPUTER LSI-circuit and crystal time base to
offer high accuracy measurement & fast measuring time.
•The last value / max. value / min. value will be automatically stored in memory
and can be obtained by pressing MEMORY CALL BUTTON.
•The use of durable, long-lasting components, including a strong, light-weight
ABSplastic housing assures maintenance free performance for many years. The
housing has been carefully shaped to fit comfortably in either hand.
2. SPECIFICATIONS
Display : 5 digits, 10mm (0.4") LCD (Liquid Crystal Display) with
function annunciation
Test Range : 5 to 100000 RPM
Resolution : 0.1 RPM (0.5 to 999.9 RPM)
1 RPM (over 1000 RPM)
Accuracy : ±(0.05% + 1 digit)
Sampling Time : 1 sec. (over 60 RPM)
Test Range Select : Automatic
Memory : Last value, Max. value, Min. value
Detecting Distance : 50 to 150mm (2" to 6"), typical max. 300mm (12"),
depending upon ambient light
Time Base : Quartz crystal
Circuit : Exclusive one-chip of microcomputer LSI circuit.
Batteries : 4 x 1.5V AA (UM-3) batteries
Power consumption : Approx. 150mA (operation)
Operation Temp. : 0 to 50°C (32 to 122°F)
Size : 191 x 72 x 38mm (7.5" x 2.8" x 1.5")
Weight : 250g (0.55 lb) (including batteries)
Accessories : Carrying case : 1 pc
Reflection tape marks (600mm) : 1pc
Operation manual : 1pc

DTO2234 GB2
3. FRONT PANEL DESCRIPTIONS
4. MEASURING PROCEDURE
Apply a reflective mark to the object being measured. Depress the MEASURE
BUTTON (5) and align the visible light beam (2) with the applied target. Verify
that the MONITOR INDICATOR (3) lights up when the measuring stabilises
(about 1 to 2 seconds).
1. Reflective mark
2. Signal light beam
3. Monitor indicator
4. Display
5. Measure button
6. Memory call button
7. Battery compartment / cover
1
2
3
4
5
6
7

DTO2234 GB3
5. MEASURING CONSIDERATION
5.1 REFLECTIVE MARK
Cut and peel the adhesive tape provided into approx. 12mm (0.5") squares and
apply one square to each rotation shaft.
a. The non-reflective area must always be larger than the reflective area.
b. If the shaft is normally reflective, it must be covered with black tape or paint
before attaching reflective tape.
c. The shaft surface must be clean and smooth before applying reflective tape.
5.2 VERY LOW RPM MEASUREMENT
It is easy to get high resolutions and a fast sampling time. If you want to measure
very low RPM values, we suggest you to attach more "REFLECTIVE MARKS"
dividing the area equally. Then divide the reading shown by the number of
"REFLECTIVE MARKS" to get the real RPM.
5.3 REMOVE BATTERIES
If the instrument will not be used for an extended period, remove the batteries.
6. MEMORY CALL BUTTON OPERATION
6.1 A readout (the last value, max. value, min. value) obtained immediately before
turning off the MEASURING BUTTON is automatically memorised. For
example, please refer to figure 2 below.
Measuring Time
Max Value
Min Value
Last Value
Display
Reading

DTO2234 GB4
6.2 The memorised value will be displayed on the indicator when :
A. First push - To display the last value :
"LAST" and "the last value" will be displayed by turn.
B. Second push - To display the maximum value :
"MAX" and "the max. value" will be displayed by turn.
C. Third push - To display the minimum value :
"MIN" and "the min. value" will be displayed by turn.
7. REPLACING BATTERIES
1. When it is necessary to replace the batteries (battery voltage less than approx.
4.5V), "LO" will appear on the display.
2. Slide the battery cover (7) away from the instrument and remove the batteries.
3. Install the batteries (4 x 1.5V AA/UM-3) correctly into the case. Permanent
damage to the circuit may result from incorrect installation.