ARRI SRH-3 Operating instructions

SRH-3
Date 01.12.2019
Trouble Shooting 1.0

Imprint
Copyright © 2018 Arnold & Richter Cine Technik GmbH & Co. Betriebs KG.
All rights reserved.
No parts of this document may be reproduced without prior written consent of Arnold & Richter Cine
Technik GmbH & Co. Betriebs KG. Specifications are subject to change without NOTE. Errors,
omissions, and modifications excepted.
ARRI, ALEXA, AMIRA, LDS and LENS DATA SYSTEM are trademarks or registered trademarks of
Arnold & Richter Cine Technik GmbH & Co. Betriebs KG.
All other brands or products are trademarks or registered trademarks of their respective holders and
should be treated as such. Original version.
For further assistance:
Arnold & Richter Cine Technik GmbH & Co. Betriebs KG
Türkenstr. 89
80799 München
Germany
www.arri.com
Document revision history
Version Order Nr Release Date
1.0 01.12.2019
Scope
This document describes the components and the setup and programming of the SRH-3 Remote
Control.
Disclaimer
Before using the products described in this manual, be sure to read and understand all the respective
instructions.
Otherwise the customer must contact ARRI before using the product.
While ARRI endeavours to enhance the quality, reliability and safety of their products, customers
agree and acknowledge that the possibility of defects thereof cannot be eliminated entirely. To
minimize the risk of damage to property or injury (including death) to persons arising from defects in
the products, customers must incorporate sufficient safety measures in their work with the system and
heed the stated conditions of use.
ARRI or its subsidiaries do not assume any responsibility for losses incurred due to improper handling
or configuration of the TRINITY or other system components.
ARRI assumes no responsibility for any errors that may appear in this document.
The information is subject to change without NOTICE.
For product specification changes after this manual was published, refer to the latest published ARRI
data sheets or release notes, etc., for the most up-to-date specifications.
Not all products and/or types are available in every country. Please check with an ARRI sales
representative for availability and additional information.
Neither ARRI nor its subsidiaries assume any liability for infringement of patents, copyrights or other
intellectual property rights of third parties by or arising from the use of ARRI products or any other
liability arising from the use of such products. No license, express, implied or otherwise, is granted
under any patents, copyrights or other intellectual property right of ARRI or others.
ARRI or its subsidiaries expressly exclude any liability, warranty, demand or other obligation for any
claim, representation, cause, action, or whatsoever, express or implied, whether in contract or not,
including negligence, or incorporated in terms and conditions, whether by statue, law or otherwise. In
no event shall ARRI or its subsidiaries be liable for or have a remedy for recovery of any special,
direct, indirect, incidental, or consequential damages, including, but not limited to lost profits, lost
savings, lost revenues or economic loss of any kind or for any claim by a third party, downtime, good-
will, damage to or replacement of equipment or property, any cost or recovery of any material or
goods associated with the assembly or use of our products, or any other damages or injury of the
persons and so on or under any other legal theory.
In the event that one or all of the foregoing clauses are not allowed by applicable law, the fullest
extent permissible clauses by applicable law are validated.
Imprint

For your safety
All directions are given from a camera operator's point of view. For example, camera-right
side refers to the right side of the camera when standing behind the camera and operating
it in a normal fashion.
The appendix at the back of the manual contains useful reference material including
specifications, connector pin-out diagram.
Before use, please ensure that all users comprehensively read, understand, and follow the
instructions in this document.
1.1 Risk Levels and Alert Symbols
Safety warnings, safety alert symbols, and signal words in these instructions indicate
different risk levels:
The SRH-3 system and products should only be used by experienced and
trained operators. This product is NOT designed for inexperienced users
and must not be used without proper training.
ARRI recommends that all users of the SRH-3 system read the manual in its
entirety prior to use.
Warning
DANGER indicates an imminent hazardous situation which, if not avoided,
will result in death or serious injury.
WARNING indicates a potentially hazardous situation which, if not avoided,
may result in death or serious injury.
CAUTION indicates a potentially hazardous situation which, if not avoided,
may result in minor or moderate injury.
NOTICE
NOTICE explains practices not related to physical injury. No safety alert
symbol appears with this signal word.
NOTE
Provides additional information to clarify or simplify a procedure.
DANGER
Warning
CAUTION
For your safety

User Advisory / Application Requirements
The SRH-3 system and products should only be used by experienced and trained operators. This
product is NOT designed for inexperienced users, and must not be used without proper training.
Stabilization of Remote Heads is an extremely complex and at times difficult task and therefore
stabilized remote heads do have their limitations. For example, the SRH-3 will only correct for angular
movement and not parallel movement. This means that when the SRH-3 is attached directly to a lift,
or to a pole, or structure that is subjected to vertical movement, it cannot compensate for lift as it
moves up and down (because that movement is parallel). In order to absorb vertical and parallel
movements, the SRH-3 must be mounted on a suitable shock absorber.
Stabilization systems are limited by engine power, as well as their bandwidth or frequency response.
Very fast movements required to correct the camera position may not be within system capabilities.
This can be seen when using longer lenses.
The use of suitable Iso Dampers devices improves the application.
Mounting a suitable Iso Dampers device between the SRH-3 and the mounting point of the head, will
soak up the fast, unwanted movements, leaving the stabilization with unwanted movements that are
slower and within the bandwidth of the system.
There are many Iso Damper devices that follow different designs and qualities. Choosing the right Iso
Damper is as important as the stabilized head itself.
Another purpose of Iso Dampers is that they decouple the stabilized remote head from some
resonance and flexing of the mounting point.
All gimbal-based stabilized remote heads will always face some kind of drift.
Drift is unwanted movement of the system usually caused by the gyros and the earth’s rotation, which
can’t be measured by the MEN sensors.
Drift is normally measured in degrees per hour.
The SRH-3 has a very small amount of drift that would only be noticed while the head is stationary
over a long period of time. The average drift can be up to approximately 10° in 30 minutes.
Drift can also be caused by a non-calibrated joystick or a loose camera setup, or an Iso Damper that
is too soft.
Reduction of flexing or bending of the camera and lens package, and flexing of the remote head
attachment are critical. The overall setup needs be as rigid as possible because any flexing can cause
the head to vibrate or oscillate. Every attempt to improve the stiffness of the camera setup and the
head attachment, and to reduce or eliminate any flexing should be made.
Many different camera and lens packages can be used with the SRH-3, and there are also many
different ways to mount the SRH-3. As a result, it is not always possible or practical to obtain perfect
conditions regarding rigidity and balance. This may cause the load to become unstable and it will then
shake and oscillate when the stabilization is active. In these situations, adjustment of the PID
parameters will be required. The correct setting of these PID values is crucial for the proper working of
the system.
An unbalanced camera setup will place more strain on the motors of the SRH-3. The system will need
more force to move the load and this will sometimes increase the possibility of the load becoming
unstable, and that the SRH-3 may over compensate or shake and oscillate.
Please remember that what the SRH-3 is mounted on, and the manner in which it is mounted, will
directly impact on its performance. The total mass of the head and its load are an important
consideration when choosing how and where to mount it. This torque will change in direction and
amplitude in varying amounts. The more solid the mount, the easier it is for the system to perform
well. Sometimes even the levelling linkage on a camera crane will have play or backlash that allows
the mounting point to move slightly when loads are reversed. If there is mechanical play between the
components in the shock absorber, vibrations of the overall system may occur. Iso Dampers with the
appropriate dimensions and hardness should always be used - the system may become too elastic if
the Iso Damper used is too soft, causing vibration.
User Advisory / Application Requirements

Wiggle in framed picture
NOTE
Any loose part, like loose clamps, or accessories, or part which can move because
of wind force or pressure cycle can cause vibrations.
NOTE
If a long or heavy lens is mounted a lens support is recommended.
• Test the stiffness of the camera by pushing the back of the camera package
against the ring.
If you can see a slight movement / flexing use a top support bracket to get the
camera setup solid.
HINT
A fast quick fix can be a small wooden wedge placed between the camera top
and the ring.
• Check the setup where the SRH-3 is mounted at.
(Damper, Mitchell Mount, Dolly and so on)
• Hold the base of the pan axle with both hands and try to twist or move the base.
• If you can feel a small play, check the attachment, like the castle nut of the Mitchell
Mount.
Check if all other screws are tighten too, like the Mitchell Mount thread mounted to
the base of the SRH-3.
• Also control all following mechanical and support parts and products, like:
Iso Damper, Spring Arm and Speed Rails.
NOTICE
Any play in the connections and attachments will generate vibrations.
NOTE
The SRH-3 can compensate circular movements in three axes, but all linear
movements need to be covered by an Iso Damper and Spring Arm.
Wiggle
Each of these aspects can lead to the motor power of single axis having
to be lowered, which will limit the effectiveness of the overall stabilization.
CAUTION
iggle in framed pictre
 An loose part hich can moe becase of indforce or preassre ccle can case ibrations
 If a long or hea lens is monted a   is needed
 Test the fleibilit of the camera b pshing the camera package again the ring If o can see
a slightl moement se a  bac to get it solid A fast qick and dirt fi can be
a small edge beteen the camera topside and the ring
K

 Check the setp here the SRH is monted at Grab the PAN socket and tr to trn it ith
or hands If o can feel a small pla check the connection  Mitchell Mont  if the nt or
scres are tighten
 Control all folloing mechanical parts becase of pla in the connectionsI Da
Sa and Sda
 The SRH can compensate circlar moements in three aies bt all linear moements need
to be coered b a I Da and a