Checkline DT-326 User Manual

DT-326

LED Stroboscope

Operation Manual

Read manual thoroughly prior to operation.
Use instrument only after reading the complete manual.
Follow all safety precautions.

Safety Precautions

Avoid the following.

Please be sure to closely follow all safety precautions.

Be sure to read the entire instruction manual thoroughly before initial set-up, operation and maintenance.
The instruction manual provides two grades of safety warnings: "Danger" and "Caution".
Follow these precautions.

Danger

"Danger" marking indicates possible death, severe injury or fire if the user disregarded.

Caution

"Caution" marking indicates possibility of severe bodily injury or object damage if operated improperly.

This warning indicates a prohibited operation.

Execute this warning.

Never use in flammable
environments.

May result in fire or explosive.

Danger

Never look directly into the LED light
source.

May result in eye injury.

Do not drop.

May cause damage or injury.

Do not alter, modify or dispose of
improperly.

May cause damage, accidents and void warranty.

To clean, gently wipe with a soft
cloth.

No volatile chemicals such as usage Benzene, Thinner,
or Alcohol.

Caution

Direct sunshine, condensation, dust or caustic
Chemicals, combustible gases
Oils, water, salts

Operate within 0-35°C(32-95°F),
35-85%RH

May alter operation of the unit.

Hot! Hot!

Use a tripod or other fixed device for over 2 hour of
continuous operation.

- Contents -

1

Summary

2

Product Inspection and Preparation

2.1 Confirmation of product packaging

2.2 Removal of protective sheet................................

2.3 Installation of Battery

3

Names and functions of the components

3.1 DT-326 Unit

3.2 Operation panel

3.3 LCD Display

3.3.1

3.3.2

3.3.3

3.3.4

3.3.5

3.3.6

4

Function Instructions

4.1 Power on/off

4.2 Mode Selection

4.3 Internal flashing mode

4.3.1

4.3.2

4.3.3

4.3.4

4.3.5

4.3.6

4.3.7

4.4 External Trigger Mode

4.4.1

4.4.2

4.4.2.1 “Delay time” setting

4.4.2.2 “Delay angle” setting

4.4.3

4.4.4

4.5 Parameter Setting Instruction

4.5.1

4.5.2

4.5.3

4.5.3.1 Delay time setting

4.5.3.2 Delay angle setting

4.5.4

4.6 Power-saving settings

4.6.1

4.6.2

4.6.3

4.7 Connector of External input/output................................

4.7.1

4.7.2

4.7.3

4.7.4

5

Specifications

6

Dimensions

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Display Names and Descriptions
Main data display
Sub data display
Units of Measure: Display
Setting project display
Battery Indication

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Instruction for Internal flashing mode
Changing Units of Measure in Internal Mode
ECO function
Flash rate and frequency “Internal Mode”
Multiply / Divide by 2 Function
Phase Shift (Angle)
Flash Pulse Duration (RATIO) setting

External trigger mode: LCD display information
Flash Delay Setting

Units of Measure- Changing from FPM to Hz................................

ECO feature

Measurement range setting
Trigger Edge setting (External Mode)

Delay setting................................

Back light setting

LED flashing auto off
Auto Power off
LCD back light off

Connector specs and pin type

External Pulse Input................................

External pulse output
Option Cable- Input/ Output cable adaptor

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3232

1 Summary

The DT-326 LED Stroboscope is a portable, AC/DC powered precision instrument used to illuminate and
measure the rotational speeds of objects with a certain speed and a constant period. By illuminating the
rotating object with the DT-326, the moving object appears to remain still when the flashing rate of the
DT-326 is equals the rotational speed of the target object. This allows inspection of rotating and moving
parts, gears, shafts and others. Additionally, the target object can appear to rotate back or forth (frequency)
by utilizing the phase shift function.

Main features

Two units of measure- FPM (flashes per minute) and Hz.
=>refer to 4.3.2 unit conversion

Wide flash range- 60 to 120,000 FPM
=> refer to 4.3.4 Flash rate setting

Multiply or Divide by 2- function to quickly adjust flash rate
=>refer to 4.3.5 Multiply/Divide the flash rate by 2

Phase Shift function - “+3°”, “-3°”
=> refers to 4.3.6 Phase shift by degrees

Adjustable flash duration – (RATIO) Time can change for 0.1° each time as in the range of 0.1° / 360° - 2.5° / 360°
=> refer to 4.3.7 Flash duration (ratio) setting

External input/output port-Synchronization of flash rate with external pulse, or flash rate pulse signal output
=>refer to 4.4 External trigger model, 4.7 External input/output connector

1

2 Product Inspection and Preparation

1. O

ne (1)

LED stroboscope

2.

Four (4) alkaline batteries (AA)

5. Operation Manual

2.1 Confirmation of product packaging

Confirm the following five parts in your DT-326 packaging:

3. One (1) AC

Adapter (120V/240V, 50/60Hz)

6. One (1) Option Cable- Input/ Output cable adapter if you ordered

4. One (1) set of External input/output connector
3240-10P-C [HIROSE ELECTRIC CO., LTD.]

2

2.2 Removal of protective sheet

Remove both protective sheets covering the operation panel and light source as shown below.

Protective sheet

Light source

Operation panel

2.3 Installation of Battery

Turn coin screws counter-clockwise to remove battery cover, and insert batteries in proper polarities as shown
below:

Battery cover

Coin screw

* Avoid battery leakage/ corrosion when not in use for extended period of time.

3

3 Names and functions of the components

3.1 DT-326 Unit

LCD indicator display

Flash rate/frequency
setting dial

LED light source (3 totals)

Operation keys (9 totals)

4

3.2 Operation panel

2

3

4

5

6

No. Key Function Instructions

1 POWER Power the unit on or off

1

7

9
8

10

2 MODE

3 SET

4 ×2

5 1/2

6 RATIO

7 PHASE “+”

8 PHASE “-“

9 Dial

10 ECO

Select Internal/ External/ Parameter mode of operation

Unit change, Select parameter setting item, Store setting value.

Multiplies the flash rate/frequency by a factor of 2.

instruction

Divides the flash rate/frequency by a factor of 2.

Adjusts the flash duration (flash pulse width) in Internal/External mode.

Advance image forwards 3 degrees at a time in internal mode.
In parameter setting mode, change setting value.

Retard image backwards 3 degree at a time in internal mode.
In parameter setting mode, change setting value.

Set flash rate or frequency.
CW; Increase flash rate/frequency.
CCW; Decrease flash rate/frequency.
(Turn dial “quickly” to drastically change value. Turn dial “slowly” to change value 1 digit.)
In parameter setting mode, CW or CCW rotating changes the setting value.

Push once to reduce LED brightness (Economy mode).
Push again to return back (Normal mode).

5

3.3 LCD Display

Auto Range

min

ms

Unit set to FPM

Unit set to Hz

min

min

Min

3.3.1 Display Names and Descriptions

Battery indicator Main data display

Setting project

Sub data

3.3.2 Main data display

- Internal flashing mode: Displays flash rate.

- External trigger mode: Display external trigger frequency.

-Display will indicate “P” or “LCD” (in ON/OFF setting of LCD backlight) in *Parameter setting mode.

*Parameter setting mode: Display LCD backlight setting (“P” or “LCD”)

3.3.3 Sub data display

Internal Flash Mode Display

-To change the degrees of phase shift, press PHASE + or PHASE - keys. The display will reflect the
cumulative angle of phase shift.

-“Flash Time” will be displayed when RATIO key is pressed. The flash time (pulse flash duration) can then
be set using the dial to increase or decrease the flash time from 0 to 2.5 (0 - 2.5°) degrees.

External Trigger Mode Display

-Displays delay time setting. Refer to section 4.4.2 for detail.

*Parameter Mode Display

- Displays the following:

-Selected measuring range

-Delay time (in ms)

-Backlit LCD (ON or OFF)

*Refer to 4.5 “Parameter setting mode” for detail.

3.3.4 Units of Measure: Display

Digital display will show the following according to the unit of measure setting.

(flashes/minutes)

Trigger Divider
Edge Delay Deg
Flash Time

AveLastMinMax

Mem

Hz

sec
Hz

○○○○

Unit

Ｈｚ

Ｈｚ

ＨｚＨｚ

Flashing
(Blinking)

6

3.3.5 Setting project display

Auto Range

Auto Range

Auto Range

Auto Range

Auto

Range

Auto

Range

Auto Range

Auto Range

Auto Range

elay time when delay

Auto Range

The following will be displayed, according to the mode of measure and *parameter settings

Trigger Divider
Edge Delay Deg

Flash

Time Mem

AveLastMinMax

Internal flashing mode

Trigger Divider
Edge Delay Deg
Flash Time Mem
AveLast

MinMax

ECO mode

Trigger Divider

Edge Delay Deg
Flash Time Mem
AveLastMinMax

Positive auto trigger

Trigger Divider
Edge Delay Deg
Flash Time Mem
AveLastMinMax

Set the measuring
range in Parameter
setting mode*

Trigger Divider
Edge Delay Deg

Flash Time

AveLastMinMax

Mem

Set the flash time
(duration)

Trigger Divider
Edge Delay Deg

Flash Time Mem
AveLastMinMax

Choose positive when set
trigger edge in *Parameter
setting mode

Trigger Divider
Edge

Delay Deg

Flash Time Mem
AveLastMinMax

Choose angle setting when
delay set in *Parameter
setting mode

* Please see section 4.5 for Parameter setting data.

3.3.6 Battery Indication

Indicates remaining battery charge capacity in flashing operation mode.

Battery full Battery diminished Near zero

No battery indication while AC powered.

Trigger Divider

Edge Delay Deg
Flash Time Mem
AveLastMinMax

Negative auto trigger

Trigger Divider
Edge Delay Deg

Flash Time Mem
AveLastMinMax

Choose negative when set
trigger edge in *Parameter
setting mode

Trigger Divider
Edge

Delay Deg

Flash Time Mem
AveLastMinMax

Choose d
set in *Parameter setting mode

7

4 Function Instructions

○○○○

○○○○

○○○○

○○○○

○○○○

○○○○

○○○○

4.1 Power on/off

Press “POWER” key to turn on unit. The unit will begin to flash in internal mode and the display will indicate
the flash rate (FPM = flashes per minute).

Operation Indication

Power off

POWER

Press and release

Press “POWER” key again to turn off unit. The display will turn off, and the device will stop flashing.

Operation Indication
Power on

POWER

Press and release

Auto Range
Trigger
Edge Deley Deg
Flash Time

Ave Last Min Max

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

min
sec

hHz

min

sec

hHz

POWER

POWER

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

Auto Range
Trigger
Edge Deley Deg
Flash Time

Ave Last Min Max

Display will indicate the
flash rate in internal
mode, and the LED light

min

source will begin

sec

hHz

flashing.

Display will turn off and
unit will stop flashing.

min
sec

hHz

4.2 Mode Selection

Press and release “MODE” key to toggle between INTERNAL, EXTERNAL and PARAMETER mode.

*Refer to 4.5 “Parameter setting mode” for details.

Operation Indication

MODE

Press and release

to switch modes

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

Internal flashing mode

min

sec

hHz

MODE

Auto Range
Trigger

Edge Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

External trigger mode

MODE

Auto Range
Trigger
Edge Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

Parameter setting mode

MODE

8

Internal flashing mode

○○○○

○○○○

○○○○

○○○○

○○○○

ternal flashing

○○○○

○○○○

4.3

4.3.1 Instruction for Internal flashing mode

Battery power
indication

In

mode

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

4.3.2 Changing Units of Measure in Internal Mode

Press and release “SET” key to toggle between FPM and Hz measuring unit.

Operation Indication

SET

Press and release

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

min

sec

hHz

SET

min

sec

hHz

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

Flashing time (Hz shown)
setting
Flash indicator

Unit (min or Hz)

“Min” means Eco mode
Total phase shift angle

SET

min
sec

hHz

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

min

sec

hHz

Measuring unit “FPM”

Measuring unit “Hz”

4.3.3 ECO function

Press and release “ECO” key to toggle between Normal and ECOnomy power save mode.

Operation Indication

FLASH

ECO

Press and release

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

Normal mode

min

sec

hHz

ECO

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

ECO mode

min

sec

hHz

Measuring unit “FPM”

ECO

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

Normal mode

min

sec

hHz

9

4.3.4 Flash rate and frequency “Internal Mode”

Set the flash rate (frequency) by turning the center dial.

Clockwise: Increase

Counter-clockwise: Decrease
For small adjustments, turn the dial slowly. For large adjustments, rotate the dial quickly.
The flash rate and resolution differs according to measuring range. Refer to section 4.5.1 for details.

Notes for setting the flash rate

One function of a stroboscope is to provide a “Frozen” virtual image of a rotating target once the flash rate
of the stroboscope matches the rotational speed of the target object (FPM=RPM). The stroboscope will
also show a single image when the flash rate or frequency is set to a lesser multiple of the RPM (1/2, 1/3,
etc.) When the flash rate is increased to a high multiple (2, 3, etc.), multiple images will appear. To find the
true RPM of the target object, begin by lowering the FPM to lower multiples until only a single image
appears. For more information regarding the multiply/divide by 2 function, please see 4.3.5.

“Frozen”

virtual image

1

True rotational speed of

target object

(rpm)

900

Pattern

2 times

1/2 times

Flash rate of
stroboscope

(FPM)

3600 4 times 4
2700 3 times 3
1800 2 times 2

900 1 times 1

450 1/2 times 1
300 1/3 times 1

3 times

1/3 times

Motor

4 times

Multiple of true

rotational speed

Number of

stopped

images

10

4.3.5 Multiply / Divide by 2 Function

○○○○

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○○○○

○○○○

○○○○

○○○○

The flash rate or frequency can be doubled or halved by the”x2” and “½” keys on the operation panel.

1) Doubling the flash rate (x2)
Press “x2” key to multiply the current flash rate by a factor 2 until the max flash rate is reached.

Operation Indication

FLASH

×2

Press and release

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

min

sec

hHz

×2

Auto Range
Trigger
Ehidge Deley Deg

Flash Time

Ave Last Min Max

min

sec

hHz

Auto Range
Trigger
Edge Deley Deg

Flash Time

×2

Ave Last Min Max

min

sec

hHz

Ex. Flash rate 1,500 FPM

Double the rate 3,000 FPM

After the flash rate (frequency) changes, it becomes the new value based on the set display resolution. (See
section 5. Specifications) Therefore, the frequency is not to return to the original frequency, even if “½”key is
pressed after pressing “x2” key.

2) Halving the flash rate (½)
Press “½” key to divide the current flash rate by a factor of 2 until the min flash rate is reached.

Operation Indication

FLASH

1/2

Press and release

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

min

sec

hHz

Ex. Flash rate 1,500 FPM

1/2

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

Half the rate 750 FPM

min

sec

hHz

Double the rate 6,000 FPM

Auto Range
Trigger
Edge Deley Deg

Flash Time

1/2

Ave Last Min Max

Half the rate 375 FPM

min

sec

hHz

After the flash rate (frequency) changes, it becomes the value based on the set display resolution. (See
section 5. Specifications) Therefore, the frequency is likely not to return to the original frequency even if
“x2”key is pressed after pressing “½” key.

11

4.3.6 Phase Shift (Angle)

Press and release

Press and release

○○○○

○○○○

○○○○

○○○○

○○○○

○○○○

360° 360°

0.1°-

2.5°

OFF

Once "Frozen" virtual image is achieved via FPM=RPM, the phase shift function can advance or delay the
flash so that the image appears to be slowly rotating CW or CCW incrementally.
Press “PHASE+” key or “PHASE-“ key to increment or decrement the phase shift angle by 3°.
The display will show the cumulative angle of the phase shift.

Operation Indication

FLASH

PHASE+

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

min

sec

hHz

PHASE+

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

min

sec

hHz

PHASE+

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

min

sec

hHz

Ex. Flash rate 6,000 FPM

Phase shift at 0°

Operation Indication

FLASH

PHASE-

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

Ex. Flash rate 6,000 FPM

Phase shift at 0°

4.3.7 Flash Pulse Duration (RATIO) setting

The RATIO can be set within the range of 0.1°/360° - 2.5°/360°, with a resolution of 0.1°.
Period of flashing = 360°.

Flash

ON

The Flash Pulse Duration (RATIO) is directly proportional to the LED brightness, which in turn, is inversely related
to the target image focus.

If "PHASE +" key is pressed at 357°, it becomes 0°.

min

sec

hHz

PHASE-

If "PHASE -" key is pressed at -357°, it becomes 0°.

Flashing Duration (

Increment phase shift by 3°

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

min

sec

hHz

Decrement phase shift by 3°

)

Increment phase shift by 3°

Final phase shift of 6°

Auto Range
Trigger
Edge Deley Deg

Flash Time

PHASE-

Ave Last Min Max

Decrement phase shift by 3°

Final phase shift of -6°

min

sec

hHz

12

Press the “RATIO” key. The current mode will start blinking for 5 seconds allowing modification at this point.

When blinking, flash duration can be modified (see

○○○○

RATIO

○○○○

○○○○

○○○○

○○○○

RATIO

RATIO

RATIO

○○○○

When blinking, flash duration can be modified (see next

RATIO

Operation Indication

Internal flashing mode

External trigger mode

FLAS

Press and release

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

min

sec

hHz

Phase shift
angle

FLAS

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

next section for directions on this step)

min

sec

hHz

Flash pulse
duration
(blinking)

Auto Range
Trigger

Edge Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

Flash delay
angle

FLAS

Auto Range
Trigger

Edge Deley Deg

Flash Time

Ave Last Min Max

section for directions on this step)

min

sec

hHz

Flash pulse
duration
(blinking)

**

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

FLAS

min

sec

hHz

**

Auto Range
Trigger

Edge Deley Deg
Flash Time

Ave Last Min Max

FLAS

Phase shift
angle

Return to normal internal flashing

mode and display

Return to normal external

triggering mode and display

** While in the flash pulse duration setting mode, a 5 second timer will bring the unit back to default normal
mode, if no manual changes are made.

Press “PHASE+” key, or turn the dial clockwise direction to increment the Focus by 0.1°.
Press “PHASE-” key, or turn the dial counter clockwise direction to decrement the Focus by 0.1°.

min

sec

hHz

Flash delay
angle

13

…

…

○○○○

○○○○

○○○○

Press and release

○○○○

○○○○

Or

○○○○

Press and

release

Turn counter

Operation Expression

FLASH

PHASE+

OR

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

min

sec

hHz

PHASE+

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

min

sec

hHz

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

min

sec

hHz

Turn clockwise

FLASH

PHASE-

OR

clockwise

Flash duration (RATIO)

0.1°/ 360°

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

Current (RATIO)

2.5°/ 360

Incremented

0.2°/ 360 °

Maximum

2.5°/ 360

°

Auto Range

min

sec

hHz

PHASE-

Or

Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

min

sec

hHz

Decremented

°

2.4°/360°

Auto Range
Trigger
Edge Deley Deg

Flash Time

Ave Last Min Max

Minimum

0.1°/ 360°

min

sec

hHz

14

4.4 External Trigger Mode

○○○○

Battery Indicator

External Trigger

○○○○

ms

○○○○

ms

This mode allows synchronization of the FPM with external signal input such as a sensor.
See section 4.7 for details.
Parameter settings are possible, like phase shift, delay time, flash duration, edge trigger.

4.4.1 External trigger mode: LCD display information

Mode Indicator

Auto Range
Trigger

Edge Deley Deg
Flash Time

Ave Last Min Max

Min

Sec

hHz

The frequency of the external signal is measured each period, while the latest external frequency
measurement is updated every 50ms.
For an out of range external input signal, the display will appear as follows:

External signal < 60FPM/1Hz.

External signal > 10,000FPM/166Hz.

4.4.2 Flash Delay Setting

This mode allows for delayed flashing once an external signal is triggered.
The unit of delay is time (msec) or degree (°).
Press “PHASE+” or ”PHASE-” key to toggle between two settings of “delay time” or “delay angle”.

Operation button Indication

FLASH

PHASE+

FLASH

PHASE-

Press and release

Auto Range
Trigger

Edge Deley Deg
Flash Time

Ave Last Min Max

PHASE+

min

sec

hHz

Frequency of external trigger input

Light off

Flash rate unit of measure: “min” or “Hz”
displayed (“min” = FPM flashes per minute)

“Min” in Eco-mode = lowest brightness setting
Flash delay time/angle display

Auto Range
Trigger

Edge Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

PHASE-

“delay angle” in deg

“delay time” in ms

15

4.4.2.1 “Delay time” setting

This can be set to 0~999 msec with a resolution of 1 ms.
The internal calculation time of the unit is 60us, which results in the actual delay time being (Setting delay
time) + 60us.
The unit will begin flashing after the 1
[Example]

Trigger: Positive edge (The instant where the delay time)

Delay time: 10ms (Independent of external input frequency)

External Pulse
Input

LED Flash

If external signal period < delay time, then the delay time value = 0.
Please note the built in 60us internal delay on top of the external signal input.

st

trigger pulse as detected per timing chart below.

100ms

Measure

frequency

Delay

10ms

80ms

Measure

frequency

10ms

Delay

16

Press "PHASE+" key to select the delay time setting. Turn dial CW to increase and CCW to decrease.

○

ms

○

ms

○

ms

Turn counter

○

ms

○

ms

○

ms

Button operation Expression

Turn clockwise

Auto Range
Trigger

Edge Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

Auto Range
Trigger

Edge Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

Auto Range
Trigger

Edge Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

clockwise

Auto Range
Trigger

Edge Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

PHASE-

Auto Range
Trigger

Edge Deley Deg
Flash Time

Ave Last Min Max

PHASE-

Go to delay angle setting

Go to delay angle setting

min

sec

hHz

Auto Range
Trigger

Edge Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

17

4.4.2.2 “Delay angle” setting

Turn clockwise

○○○○

ms

○○○○

ms

○○○○

ms

frequency

Set the delay angle from 0° to 360° in 1° increment s.
The actual delay time is as follows:

Delay angle setting

While the DT-326 does not flash at the 1

[Example]

Trigger: Positive edge
Delay angle: 36°

External Pulse
Input

LED Flash

If the frequency of the external trigger input changes, the timing of the flash is inaccurate, because the timing is
calculated based on the previous measured period.
If the current period of external trigger input is less than the previous period and the next trigger input occurs
before the flash time, the delay angle setting is ignored and the unit flashes at delay angle = 0°.
Delay angle increases as the dial is rotated to the right. The angle settings will go to 0° when angle is past 359°.

Operation Expression

360°

Auto Range
Trigger
Edge

Delay Deg

Flash Time

Ave Last Min Max

× Period of External Input + approx. 60us (Built-in)

st

trigger pulse as shown below in the timing chart.

100ms (360°)

Measure

min

sec

hHz

80ms (360°)

10ms (36°)

Delay

frequency

Auto Range
Trigger
Edge

Delay Deg

Flash Time

Ave Last Min Max

8ms (36°)

Delay Measure

min

sec

hHz

Auto Range
Trigger

Delay Deg

Edge
Flash Time

Ave Last Min Max

min

sec

hHz

PHASE+

Go to delay time setting

18

Turn counter

○○○○

ms

○○○○

ms

○○○○

ms

○○○○

○○○○

○○○○

○○○○

○○○○

○○○○

Delay Angle setting will decrease from 359° (Max) to 0° (Min) value for counter clockwise. The settings will
eventually go to 0°as when angle decreases from 359°.

Auto Range
Trigger
Edge

Delay Deg

Flash Time

Ave Last Min Max

min

sec

hHz

Auto Range
Trigger
Edge

Delay Deg

Flash Time

Ave Last Min Max

min

sec

hHz

・・・・

Auto Range
Trigger
Edge

Delay Deg

Flash Time

Ave Last Min Max

clockwise

min

sec

hHz

PHASE+

4.4.3 Units of Measure- Changing from FPM to Hz

Press and release the “SET” key to toggle between “FPM” to “Hz”.

Operation Expression

SET

Press and release

Auto Range
Trigger

Edge Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

SET

Auto Range
Trigger

Edge Deley Deg
Flash Time

Ave Last Min Max

Measuring unit “FPM” Measuring unit “Hz”

NOTE: Fraction values are rounded down.

4.4.4 ECO feature

Press and release the ECO key to reduce the brightness and conserve battery power. To return to original
brightness, press and release the ECO key again.

Operation Expression

FLASH

ECO

Press and release

Auto Range
Trigger

Edge Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

ECO

Auto Range
Trigger

Edge Deley Deg
Flash Time

Ave Last Min Max

Go to delay time setting

SET

min
sec

hHz

ECO

min

sec

hHz

Auto Range
Trigger

Edge Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

Measuring unit “FPM”

Auto Range
Trigger

Edge Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

Normal flashing mode

ECO flashing mode

Return to normal

flashing mode

19

4.5 Parameter Setting Instruction

Press to cycle

○○○○

○○○○

○○○○

ms

○○○○

ms

Press to change

Rotate the dial to

○○○○

ms

Delay angle setting

r PHASE keys to

Press “MODE” until the LCD displays “P” (Parameter setting mode).
Press the “SET” key to cycle between the various parameter settings available (range, trigger edge, delay time,
and LCD backlight). For more information regarding the various parameter settings, please refer to sections 4.5.2
through 4.5.4 below. Press the “MODE” key again to store the settings and return to measuring modes.
Note: “MODE” key must be pressed to store settings.

Operation Expression

FLASH

SET

between parameters

FLASH

PHASE+

PHASE-

Auto Range
Trigger
Edge Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

SET

Auto Range

Trigger
Edge

Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

SET

Auto Range
Trigger

Delay Deg

Edge
Flash

Time

Ave Last Min Max

min

sec

hHz

the selected

parameter setting

OR

change

the selected

parameter setting

Measuring range setting
(Press “+”, “-“ key or turn

the dial to switch the

measuring range)

Trigger edge setting

(Press “+”, “-“ key or turn

the dial to change the

trigger edge setting)

SET

Auto Range
Trigger

Delay Deg

Edge
Flash Time

Ave Last Min Max

LCD backlight

(Press “+”, “-“ key or turn the

dial to change the backlight

settings)

Set and store parameter settings

MODE

min

sec

hHz

SET

Delay time setting

(Use dial or PHASE keys to

change settings)

PHASE+

Auto Range
Trigger
Edge

Delay Deg

Flash Time

Ave Last Min Max

(use dial o

change settings

PHASE-

min

sec

hHz

20

4.5.1 Measurement range setting

○○○○

ms

○○○○

ms

Turn counter

○○○○

ms

○○○○

ms

Press and release

The DT-326 has a selectable measuring range, which can be set in the Parameter mode setting. The
range and resolution of this setting will be different for each measuring range, as indicated in the table
below.

Test unit Measuring range as Indicated in Parameter Settings

FPM

(range 60.0 - 12,000.0)

Hz

(range 1.000 - 200.00)

*Note that if the flash range is changed to a lower range, the current flash rate, if larger than 12,000 FPM or
200 Hz, will decrease to the maximum allowable value of the range.

Ex: If flash rate is set to 60,000 FPM in the range of 60 – 120,000 FPM, it will automatically switch to
12,000 FPM when the flash measuring range parameter is changed to 60.0 – 12,000.0 FPM. The max
value is limited if the Flashing time (frequency) setting is greater than the range in the test range switch.

To adjust the measuring range parameter, press “PHASE +” or turn the dial clockwise to set the range as
“120,000 FPM” or “2000 Hz”
Press “PHASE -” or turn the dial counter clockwise to set the range as “12,000 FPM” or “200 Hz”.

Operation Expression

PHASE+

Press and release

Auto Range
Trigger
Edge Deley Deg
Flash Time

Ave Last Min Max

12,000

200

min

sec

hHz

FLASH

PHASE+

Or

120,000

(range 60 - 120,000)

2,000

(range 1.00 - 2000.0)

Auto Range
Trigger
Edge Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

Measuring range set to

“60 - 120,000 FPM”

Turn clockwise

PHASE-

Measuring range set to

“60.0 - 12,000.0 FPM”

FLASH

clockwise

Auto Range
Trigger
Edge Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

Measuring range set to

“60 - 120,000 FPM”

PHASE-

Or

Auto Range
Trigger
Edge Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

Measuring range set to

“60.0 - 12,000.0 FPM”

21

○○○○

ms

○○○○

ms

○○○○

ms

○○○○

ms

Turn counter

Press and release

Operation Expression

FLASH

PHASE+

Press and release

Auto Range
Trigger
Edge Deley Deg
Flash Time

Ave Last Min Max

min
sec

hHz

FLASH

PHASE+

Or

Auto Range
Trigger
Edge Deley Deg
Flash Time

Ave Last Min Max

min
sec

hHz

Turn clockwise

FLASH

PHASE-

clockwise

Measuring range set to

“1 – 200 Hz”

Auto Range
Trigger
Edge Deley Deg
Flash Time

Ave Last Min Max

Measuring range set to

“1 – 2000 Hz”

min
sec

hHz

FLASH

PHASE-

Or

Measuring range set to

“1 – 2000 Hz”

Auto Range
Trigger
Edge Deley Deg
Flash Time

Ave Last Min Max

min
sec

hHz

Measuring range set to

“1 – 200 Hz”

22

4.5.2

Trigger

Edge setting (External Mode)

Select Positive or Negative edge.
Examples:

-When trigger edge setting is set to “Positive Edge”, the flash will occur on the leading edge of the input
pulse (when delay setting is zero).

External Pulse signal
from machine/sensor

Stroboscope flash

* * *

*Delay time (based on the delay settings of parameter)

-When the trigger edge setting is set to “Negative Edge”, the flash will occur on the trailing edge of the input
pulse (when delay setting is zero).

External Pulse signal
from machine/sensor

Stroboscope flashing

* * *

:*Delay time (based on the delay settings of parameter)

23

Press the “SET” key to cycle to the Trigger Edge setting parameter mode.

Press and release

○○○○

ms

Turn clockwise

Or

Or

○○○○

ms

○○○○

ms

○○○○

ms

Trigger edge set as

Turn counter

clockwise

Press and release

To set the trigger edge as “Down edge”, press “PHASE -“key or turn the dial clockwise.
To set the trigger edge as “Up edge”, press “PHASE +” key or turn the dial counter clockwise.

Operation Expression

FLASH

PHASE-

PHASE+

Auto Range

Trigger
Edge

Deley Deg
Flash Time

Ave Last Min Max

Trigger edge set as

“Positive edge”

Auto Range

Trigger
Edge

Deley Deg
Flash Time

Ave Last Min Max

“Negative edge”

min

sec

hHz

min

sec

hHz

FLASH

PHASE-

FLASH

PHASE+

Auto Range

Trigger
Edge

Deley Deg
Flash Time

Ave Last Min Max

Trigger edge set as

“Negative edge”

Auto Range

Trigger
Edge

Deley Deg
Flash Time

Ave Last Min Max

Trigger edge set as

“Positive edge”

min

sec

hHz

min

sec

hHz

24

4.5.3 Delay setting

○○○○

ms

○○○○

ms

○○○○

ms

Go to delay angle setting

○○○○

ms

○○○○

ms

○○○○

ms

Turn clockwise

Turn counter

Delay time and angle setting will allow the flash to be delayed after an external pulse is sensed by the unit.
The Parameter setting mode:
Press “PHASE +” and “PHASE -“ key, to select between delay time and delay angle.

4.5.3.1 Delay time setting

Selecting Delay time from an external pulse input to LED flashing can be set in the range of 0 – 999 msec,
with a resolution of 1msec.
For details, please refers to “4.4.2 delay time setting”
Rotate the dial clockwise to increase delay time setting or counter clockwise to decrease the delay time.

Operation Expression

Auto Range
Trigger
Edge

Delay Deg

Time

Flash

Ave Last Min Max

min

sec

hHz

Auto Range
Trigger
Edge
Flash

Ave Last Min Max

Delay Deg
Time

min

sec

hHz

Auto Range
Trigger
Edge

Delay Deg

Flash

Time

Ave Last Min Max

min

sec

hHz

clockwise

Auto Range
Trigger

Delay Deg

Edge
Flash

Time

Ave Last Min Max

min

sec

hHz

FLASH

PHASE-

Auto Range
Trigger

Delay Deg

Edge
Flash

Ave Last Min Max

FLASH

PHASE-

Go to delay angle setting

min

Time

sec

hHz

Auto Range
Trigger

Delay Deg

Edge
Flash

Time

Ave Last Min Max

min

sec

hHz

25

4.5.3.2 Delay angle setting

○○○○

ms

○○○○

ms

○○○○

ms

Turn counter

○○○○

ms

○○○○

ms

○○○○

ms

Go to delay time setting

The delay angle can be set from 0° to 360° by 1° in crements.
Delay angle setting increases as the dial turns right, and decreases as it turns left.
Delay angle events to zero when set below 0° (min) or 360° (max).

Operation Expression

Auto Range
Trigger

Delay Deg

Edge
Flash Time

Ave Last Min Max

min

sec

hHz

Auto Range
Trigger
Edge
Flash Time

Ave Last Min Max

Turn clockwise

FLASH

PHASE+

Delay Deg

min

sec

hHz

Auto Range
Trigger

Delay Deg

Edge
Flash Time

Ave Last Min Max

min

sec

hHz

clockwise

Auto Range
Trigger
Edge
Flash Time

Ave Last Min Max

Delay Deg

min

sec

hHz

Auto Range
Trigger
Edge

Delay Deg

Flash Time

Ave Last Min Max

FLASH

PHASE+

min

sec

hHz

Go to delay time setting

Auto Range
Trigger
Edge

Delay Deg

Flash Time

Ave Last Min Max

min

sec

hHz

26

4.5.4 Back light setting

Press and release

○○○○

ms

○○○○

ms

Press and release

○○○○

ms

○○○○

ms

Turn counter

Press “SET” key in Parameter mode to enable this mode.
Turning off the backlight will conserve battery power. For more information regarding the automatic
settings of the backlight, see section 4.6.
Press “PHASE +” key to turn on the backlight. Press “PHASE -” key to turn off the backlight

Button operation

PHASE+

OR

Auto Range
Trigger
Edge Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

FLASH

PHASE+

Or

Expression

Auto Range
Trigger
Edge Deley Deg
Flash Time

Ave Last Min Max

min

sec

hHz

Turn clockwise

PHASE―

clockwise

4.6 Power-saving settings

4.6.1 LED flashing auto off

The LED flashing will automatically cease after 2 minutes of no keypad or dial operation when using
battery power. Flashing will resume with either a dial (rotation) movement or a keypad operation.
The auto LED shutoff is disabled in External trigger mode, while a signal is being received by the unit.
The LED flashing will automatically cease after 2 minutes of missing pulse input.

4.6.2 Auto Power off

The power automatically shut off after 5 minutes of no keypad or dial operation when in battery power.
To resume operation, press “POWER” key.
The auto Power shutoff is disabled in External trigger mode, while a signal is being received by the unit.
The power will automatically shut off after 2 minutes of missing pulse input.

4.6.3 LCD back light off

The LCD backlight will automatically shut off after 2 minutes of no keypad or dial operation when using
battery power. (With LCD parameter setting is “ON”)
The LCD backlight will light again with keypad or dial operation.

LCD backlight OFF

Auto Range
Trigger
Edge Deley Deg
Flash Time

Ave Last Min Max

LCD backlight ON

min

sec

hHz

FLASH

PHASE-

Or

LCD backlight ON

Auto Range
Trigger
Edge Deley Deg
Flash Time

Ave Last Min Max

LCD backlight OFF

min

sec

hHz

27

4.7 Connector of External input/output

f

P

hotocoupler

[

Input circuit

]

External

4.7.1 Connector specs and pin type

Pin No Single name Remarks

1 +12V +12V power supply output
2 G12 Ground power supply output
3 TRG_IN External pulse input
4 IN_COM Universal interface of External pulse input
5 NC (no connection)
6 NC (no connection)
7 OUT External pulse output
8 OUT_COM Universal interface of External pulse output
9 NC (no connection)

10 FG Ground electrode of frame work

Connector type DT-326 side: 3260-10S3 (55) [HIROSE ELECTRIC CO., LTD.]

Accessory: 3240-10P-C [HIROSE ELECTRIC CO., LTD.]

4.7.2 External Pulse Input

The unit can be operated and controlled by an external signal, from either a sensor or a machine signal like
an output from a printing press, re-winder or others. This will allow the stroboscope to flash in sync with the
target object’s rotational speed.
The input signal will have the following characteristics.

Input frequency: 60 - 10,000 FPM (1 – 160 Hz)
Input pulse width: over 50us
Delay angle: 0 - 359° (every 1°)
Delay time: 0 - 999ms (every 1ms)
Please connect with open collector output (below 1V (ON voltage)) or no-voltage contact output

(approx. 11mA current)

Connector o
External
input/output

+12V

Photocoupler

3pin

4pin

1kΩ

Inside DT-326

4.7.3 External pulse output

The unit will also output a signal that is related to the flash rate of the unit. This signal can be used to control
additional stroboscopes so that each flashes at the same rate or to send a pulse to data collectors.
External circuit: Open collector output, Voltage below DC30V, Current below 30mA
Output pulse width: Approx. 200us

[Output circuit]

7pin

(Same as TLP127 Toshiba)

[Output time]

Flashing

(36V)

8pin

Inside DT-326

pulse output

Approx. 200us

28

4.7.4 Option Cable- Input/ Output cable adaptor

Because the connector of the unit is not separate from input and output signal, the option cable adapter separated
I/O is provided for easy connection.

Output (Other device)

100mm (4”) 1,780mm (70”)

Input (Sensor)

29

5 Specifications

1-200 Hz

Model Number DT-326
Units of measure FPM (flashes per minute) or Hz (frequency)
Measuring range 1 - 2,000Hz

60 - 120,000 FPM
Accuracy +/-0.02% (at 73°F [23°C])
Resolution

of flash rate

Unit;
Hz

Measuring
range:

0.01Hz

setting in
internal
mode

Measuring
range:

0.1Hz

1-2000 Hz

Unit;
FPM

Measuring
range:
60 - 12,000 FPM

60.0 - 3,000.0 : 0.1 FPM

3,000.2 - 6,000.0 : 0.2 FPM

6,000.5 - 12,000.0 : 0.5 FPM

Measuring
range:
60 - 120,000
FPM

Flashing time (Duty)
Mode Internal Set and change

flashing rate
Phase Shift Forward/backward by 3° increments

Unit change “FPM” or ”Hz”

External
trigger

Flash rate
(Input frequency)

Input pulse width More than 50 us

Unit change “FPM” or ”Hz

Parameter

Measuring range 1 - 2000Hz (60 - 120,000 FPM) range or

setting

Trigger Edge Positive or Negative edge
Delay time/angle Delayed time : 0 - 999ms *1

60 - 30,000 : 1 FPM

30,002 - 60,000 : 2 FPM

60,005 - 100,000 : 5 FPM

100,010 - 120,000 : 10 FPM

0.1° - 2.5°/360° setting can be changed by 0.1° inc rements

Change flash rate by using dial, or “×2” and “1/2” key

1 – 166 Hz

60 – 10,000 FPM

1 - 200Hz (60 - 12,000 FPM)

Delayed angle : 0 - 359° *1

Back light Selectable- ON or OFF

Power Saving

Flash (Auto off) Stop flashing automatically after 2 min.

Function

Back light (Auto off) Turn off after 2 minutes of inactivity.

Power (Auto off) Power off unit after approx. 5 minutes in stand-by mode

Input/Output (I/F) External Trigger Input

External Trigger output Photo Coupler (Open collector) Output

Sensor Power Supply DC12V/max.40mA

*1

Built-in delay time = 60us

Photo Coupler Input, Current 12mA (approx.)

Voltage: DC30V or less, Current: 30mA or less,

Pulse width: approx.200us

30

Display LCD 6 digits (main), 5 digits (sub)

“LOW BAT”, “Setting item”, “Unit”

Back light

Flashing part

Flash Source
Life time

Luminance

(typ value)

*2

Power supply Battery

Normal
mode

ECO
mode

20cm | 6,000FPM About 1300 lx
50cm | 6,000FPM About 200 lx
20cm | 6,000FPM About 400 lx
50cm | 6,000FPM About 100 lx

AC adapter DC5V / 2.0A
Charge function None

Continuous
Flashing *2

Yellow green LED
Super High Brightness White LED
More than 1500 hours (approx. 5X108 times at 6000 FPM)

Alkaline AA battery (1.5V×4pcs) *3

Approx. 20 minutes (Flashing with AA battery in normal mode)
Approx. 80 minutes (Flashing with AA battery in ECO mode)

5500K (typ)

Temperature Range 32 - 95

°F [

0 - 35°C]
Operating humidity limits 35 – 38 % RH
Use Environment No dust, No corrosive gas
Resistance of Environment No water-proof/explosion protection and non-RoHS
Standards CE
Weight

About 500g (include batteries)

Housing Material Aluminum
Accessories

Option Accessories

*2.

Value of the new alkaline battery

*3.

Ni-MH battery (1.2V X 4 pcs) is available.

AC adapter
Connection port for External output
Carrying case,

Input/ Output cable adaptor

Alkaline AA battery (1.5V×4pcs)

31

6 Dimensions

3mm

60mm

Side

(2.36”)

Top

70mm
(2.76”)

(2.72”)

69mm

1/4-20UNF

(8.66”)

220mm

Depth 8mm

(0.32”)

(0.12”)

36mm

(1.42”)

52mm

(2.05”)

Bottom

Front

Back

(5.95”)

151mm

32