Tachometer (PHOTO TYPE)

model:dt-2234a
 measurement range:2.5～99,999r/min
 resolution:0.1/1
 accuracy:±(0.05%n+1d)
 memory: max/min/last value
 power supply:4x1.5v aa(um-3)battery
 dimension:190x72x37mm　

TABLE OF CONTENTS

1. FEATURES........................................

2. SPECIFICATIONS............................

3. FRONT PANEL DESCRIPTIONS..........

4. MEASURING PROCEDURE ...............

5. MEASURING CONSIDERATIONS .......

5-1 Reflective Mark..........................

5-2 Very Low RPM Measurement ........

5-3 Battery Removement ...................

6. MEMORY..............................................

7. BATTERY REPLACEMENT ................

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.

* Used the exclusive MICRO-COMPUTER LSIcircuit

and crystal time base to offer the high

accuracy measurement & fast measuring time.

* The last Value / max. Value / min. Value will be

automatically stored in memory and can be

displayed by turn.

* The use of durable, long-lasting components,

including a strong, light weight ABS-plastic

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, 10 mm (0.4 ) LCD (Liquid

Crystal Display).

Test Range: 2.5 to 99,999 RPM (r/min)

Resolution: 0.1 RPM (2.5 to 999.9 RPM)

1 RPM (over 1,000 RPM )

Accuracy: (0.05%+1 rpm

Sampling Time: 1 sec. (over 60 RPM)

Test Range Select:Automatic

Memory: Last Value, Max. Value, Min. Value.

Detecting Distance: 50 to 250mm / 2 to 10 inch

(typical max.350 mm /14 inch.

Depending upon ambient light).

Time Base: Quartz crystal

Circuit: Exclusive one-chip of

microcomputer LSI circuit.

Power Supply: 4x1.5VAA (UM-3) battery.

D.C Consumption: Approx. 80mA(operation).

Operation Temp. 0 to 50 (32 to 122 ).

Size: 190x72x37mm (7.5x2.8x1.5 inch)

Weight: about 300g/0.65 1b (including batteries)

Accessories:

Carrying case...................................l pc.

Reflective tape marks (350mm).........2pc.

Operation manual............................1pc.

.

4. MEASURING PROCEDURE

Apply a reflective mark to the object being

measured. Depress the MEASURE BUTTON

(Fig. 1,3-5) and align the visible light beam

(Fig. 1,3-2) with the applied target, verify that the

MONITOR INDICATOR (Fig.1,3-3) lights when

the target aligns with the beam (about 1 to 2

seconds.)

5.MEASURING CONSIDERATIONS

5-1 REFLECTIVE MARK

Cut and peel adhesive tape provided into approx.

12mm ( 0.5 ) squares and apply one sq uare to

each rotation shaft.

a. The non-reflective area must always be

greater than the reflective area.

b. If the shaft is normally reflective, it must be

covered with black tape or black paint before

attaching reflective tape.

c. Shaft surface must be clean and smoot h

before applying reflective tape.

5-2 VERY LOW RPM MEASUREMENT

As it is easy to get high resolution and fast

sampling time, if measuring the very low RPM

values, suggest the user to attach more

REFLECTIVE MARKS averagely. Then

divided the reading shown by the number of

REFLECTIVE MARKS to get the real RPM.

5-3 BATTERY REMOVEMENT

If the instrument is not to be used for any

extended period, remove batteries.

6. MEMORY

6-1 A readout (the last Value, max. Value, min.

Value ) obtained immediately before turning off

the MEASURE BUTTON is automatically

memorized. For example, please ref. Following

fig.2.

6-2 That Memorized value can be displayed on the

indicator by turn once depressing the memory

button. The symbo UP represents the Max.

Value and dn the Min. Value; LA The last

Value.

7. BATTERY REPLACEMENT

(1)When it is necessary to replace the battery,

i.e. battery voltage less than approx. 5v,

symbol will appear on the

Display.

(2)Slide the battery cover (Fig.1,3-7) away

from the instrument and remove the

batteries.

(3)Install the batteries (4x1.5V AA/UM3)

correctly into the case.