H3A eScore Target Manual

H3A Information, maintenance guide and part list

Written By Software (Super Administrator)

Updated at December 6th, 2023

 

Introduction to H3A

The H3A eScore target is a next generation electronic target based on acoustic sensors. It works with subsonic and supersonic ammunition and is designed to be placed at 100-300 meter ranges.

Features of the H3A target

  • 4 acoustic sensors, one in each corner of the target
  • Horizontal and vertical rubber bands available
  • Manual rotation of rubber bands
  • Additional armor is recommended
  • Wide range of target faces are available
  • Guide pin design allows swift change of target face, without need for additional zero point adjustment.
  • Can be used with both subsonic projectiles like .22LR (for shooting distance up to 100m) and supersonic projectiles like .223, .308, 30-06, 6.5mm, 6mm.

Technical specifications and dimensions

A

1300 mm 

B

1300 mm 

C

500 mm 

D

300 mm 

E

68 mm 

F

36 mm 

G

92 mm 

H

155 mm 

 

Temperature range -30 to +60 °C
Weight ~ 28 kg
Power consumption ~ 4.4 W  @ 24 VDC
Calibers Subsonic and supersonic projectiles

 

H Target exploded view and parts list

Exploded view Below is an exploded view of the components used in a regular eScor...

Exploded view

Below is an exploded view of the components used in a regular eScore H target. 



Part list

ID Description
1 Target frame with hatches, cables, acoustic and temperature sensors and target electronics 
3 Target electronics
4 Acoustic sensors (x4)
7 Guide pins (x4)
8 Front temperature shield (Variants available dependent of target face)
9 Rear temperature shield
10 Expanded plastic sheet with rubber (Variances according to cutout in Front temperature shield)
11 Target face (Contact your Kongsberg Target Systems dealer for available options)
12 Guide pin nuts (x8)
13 Target top cover

 

 

Disassembly

Access to the target components are done without the need for special tools. Watch the video below to get a quick walkthrough of how the different parts are put together.

H target video disassembly

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Maintenance and repairs

To find information about maintenance and repairs, expand the tabs below or locate your favorite article on docs.kongsbergtargets.com (opens in new tab)

Maintenance intervals H3A

The recommended rule of thumb rotation intervals are given in the following table:

Shooting distance Caliber notes Rotational frequency
100 m Using small bore calibers (.22LR, sub-sonic projectiles) together with big bore. In this case only one rubber band must be used After 500 rounds
100 m Using only big bore calibers (supersonic projectiles). One or two rubber bands can be used After 1000 rounds
200 m Only big bore. Two rubber bands After 1500 rounds
300 m Only big bore. Two rubber bands After 3000 rounds

 

Note that the table above assumes normal full jacketed bullets (except 22LR) and relatively good groupings. If groupings are large the intervals can be even longer.

 

 

Maintenance information, intervals and procedures

Maintenance of acoustic targets (H)

To achieve optimal reliability and accuracy the following parameters must be fulf...

To achieve optimal reliability and accuracy the following parameters must be fulfilled:

  1.  Even temperature in the target / measurement chamber
  2.  Soundproof measurement chamber
  3.  Little to no irregularities between the main rubber and the rubber band(s)
  4.  Clean sensors


1. Even temperature in the target / measurement chamber

The target is equipped with front and rear temperature shields that minimize temperature variation inside the measurement chamber. If direct sunlight shines directly on the rubber, large temperature spikes and variations in different areas of the measurement chamber.

The temperature shields are designed to minimize such spikes and variations and they also protect the rubber from UV radiation from the sunlight which can cause faster degradation of the rubber material.

The temperature shields will be shot out in the center after prolonged use. The expanded plastic sheets in the center of the front temperature screen is designed to take most of the normal wear and tear and is a cheap replacement. This should be replaced every time the rubber bands are rotated. The temperature shields themselves are have long lifetime and the rear may be replaced when the shot out area becomes excessively large.

The expanded plastic sheets with rubber are designed to seal the measurement chamber as well and increases accuracy and reduces wear on the rubber bands. When replacing these ensure do remove any debree and/or dirt inside the temperature shield opening before inserting a new plastic sheet.


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2. Soundproof measurement chamber

The target is based on acoustic measuring principals. It is therefore important that the measuring chamber is absolutely soundproof, meaning that no acoustic noise can get into the chamber. The target rubber skin and the rubber band on the target serve this function. 

Projectiles with supersonic speed generate a very powerful sound energy. It is therefore important that tears from ricochets are repaired. Big holes can be sealed with a rubber patch that is glued to the outside of the target rubber skin with contact adhesive. Smaller tears can be sealed with canvas tape. Contact adhesives will help to increase the grip of such repairs.

An unavoidable fact is wear and tear on the target rubber skin/rubber band from the shooting. After a while of shooting at the target, the holes behind the aiming mark have to be sealed. This is easily done by rotating the rubber band(s). 

How often the rubber band must be rotated varies with the following factors: 

  • Caliber and shape of the bullet
  • Spread of the shots. This usually comes down to:
    • The shooters skill level
    • Shooting distance

Specific recommendations on rotation frequency are found in the "Rotating rubber bands" section.

Shots into the target frame can cause large holes in the measurement chamber if the rubber skin on the target looses contact with the frame. Inspect the frame when doing maintenance to ensure that this is not the case. If this has occured, repair the fault by removing any loose staples, wooden splinters and anything else that can disturb the repairs. Then fasten the rubber skin with staples, glue and canvas tape.

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3. Irregularities between the rubber band(s) and the rubber skin

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Be aware

It is important that the rubber band covers the cut-out of the target rubber skin - with proper margins


Unevenness between the target rubber skin and the rubber band creates barriers for the sound that will affect the accuracy. It is very important to make sure that the target rubber skin lies nice and tight against the rubber band. If this is not the case it has one of the following causes and solution: 

Cause Solution
The main rubber skin tends to get old, decayed and has bad elasticity . The target rubber skin must be tightened and maybe changed. See chapter 3.7 for tips on replacing the target rubber skin 
The edge of the cut-out of the target rubber skin has been hit too many times. This will cause the rubber to hang into the measuring chamber of the target. The target rubber skin must be replaced. As a temporary solution it can be trimmed with a scissor. Please note that the rubber band must cover the cut-out section at any time 


Illustration of a nice and tight target rubber skin that lies closely against the rubber band.
Illustration of a poorly tightened or worn out rubber skin that is bulging away from the rubber band(s)
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4. Clean sensors

The H-target models require little - if any - cleaning of the sensors. However we recommend brushing off any debree on the sensors and vacuum dirt and debree inside the target when the rubber skin is replaced. We also recommend annual cleaning of the lower sensors as they are more exposed to dirt and debree. Be careful with the electronics inside the target when doing this.

Sensors are accessed by opening the inspection hatches at the bottom of the target. 

Closeup of sensors and target electronics behind the maintenance hatch 
(Rubber skin removed for improved visibility)


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Warning!

It is critical for the target accuracy that the hatches are closed properly before shooting at the targets to prevent outside noise to enter the measuring chamber


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Maintenance of rubber bands

Maintenance intervals and procedure for rubber band(s)

Recommended maintenance intervals of the H1E-target The recommended rule of thumb...

Rotating the rubber band(s)

The target is provided with one and/or two rubber bands (Vertical or horizontal). Every time maintenance is performed the rubber bands should be moved approximately 20 cm. A vertical rubber band is normally moved upwards in front of the target. When rotating a vertical rubber band the top cover must first be removed. It is attached with velcro and is easily lifted off the target.

If your target has both vertical and horizontal rubber bands the vertical rubber band must run INSIDE the horizontal at the front of the target and OUTSIDE the horizontal at the back. 


 

 

 

Repairs

Repairing sensors or wiring

Whenever an H-target model is used, one runs the risk of a shooter hitting the up...

Whenever an H-target model is used, one runs the risk of a shooter hitting the upper acoustic sensors, temperature sensors or their wiring. This article will show how to repair in these cases.

Repairing sensor wiring

To simplify repairs, all upper sensor wiring are run on the outside of the frame. In the case of a bullet or ricochet hitting the wiring the target electronics will detect that something is wrong with the sensor and alert you either on the monitor or via the eHub whichever applies to your range. If you do not have any of these available the circuit board within the target will display sensor status via LEDs.

If splicing is necessary, simply access the broken wire at the side of the target and splice - remember to splice the ground screen on the cable as well and make sure that there is no short circuit afterwards.

Replacing wires

In some cases it might be easier or necessary to replace the entire wiring harness and/or the sensors themselves. This can be done by removing the old wiring and / or sensors and replacing them with similar wires. Contact your KTS sales representative or distributer to get ahold of new wires and spare parts.

The sensor wires are attached to their respective numbered terminal blocks according to the tables below:

Connector No. Attached sensor
A1 Upper right sensor
A2 Lower right sensor
A3 Lower left sensor
A4  Upper left sensor
T1 Lower temperature sensor
T2 Upper temperature sensor


For sensors A1-A4 and T2 the pinout is as follows:

Wire Connection point
White 1
Black 2
Cable screen / Ground 3


For sensor T1 the pinout is as follows:

Wire Connection point
Red 1
Green 2
Yellow 3


Replacing the upper acoustic sensors

If the upper acoustic sensors are to be replaced a corner of the target skin must be loosened to access the sensor(s). We recommend to access from the front of the target. The acoustic sensors are taped to an aluminum bracket that is screwed into the frame. 

Upper right sensor mounted on its aluminum bracket. Note that the wiring varies between target models but the fastening principles are identical

Follow these steps to replace the sensor:

  • Remove the old sensor from the aluminum bracket (it is not necessary to unscrew the alumninium bracket)
  • Thoroughly clean the aluminum bracket with acetone and a cloth patch to remove residue of old glue and debree.
  • Tape the new sensor to the aluminum bracket. The sensor shall be centered at the wooden block in the corner of the frame. Center is marked. 
  • The acoustic sensors shall be placed as close to the front target rubber as possible.
  • The sensor cable is now routed through the hole and secured with cable clamp(s)
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Warning

Make sure that the sensor does not touch the rubber skin when mounted!


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Warning

It is of outmost importance that the sensor wires are not placed under tension as this may cause the sensor to slip of the bracket.


 

 

 

Protecting the H3A Target

How to protect the target from stray bullets and ricochets

Protecting the eScore acoustic target

The eScore targets have the critical electronics located at the bottom of the tar

The targets have the most critical electronic components located at the bottom of the target - behind the service panel. To minimize maintenance cost and maintain the targets durability it is recommended to protect this section of the target by the use of a knee wall or protective plates.

Please refer to this YouTube video for recommendations on how to install the targets.

 

Protection from ricochets and shrapnel

Some ranges are using a backstop that creates some shrapnel when bullets hit the bullet catchers. This should be avoided since the cables running between the targets and to the upper sensors of the H-target can be cut or short circuited by shrapnel or bullet jackets. To minimize the effects careful placement of the wiring between targets, antennas, batteries etc. must be done. If a bullet catcher is used, make sure to cover it with rubber material or other absorbent material to minimize ricochets and shrapnel exiting the bullet catcher.