This document is a user manual for the Burris Thermal Riflescopes BTS 35 and BTS 50 models. It provides instructions on installation and use of the riflescopes. Key points include:
- The riflescopes use a single 18650 battery and have functions controlled by power and roller buttons.
- Settings like color palette, brightness, contrast and zoom can be adjusted in the scope's menu.
- Features like ranging, zeroing, and calibration are described to estimate target distances, sight in the scope, and correct the image.
- Maintenance instructions are provided to properly store and clean the thermal riflescope.
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2. 1
Congratulations on your purchase of a Burris
Thermal Riflescope. Review this manual
thoroughly before using and keep it available
for future reference. This guide explains the
operation of the BTS 35 and BTC 50 models.
CAUTION
• Thermal imagers shall not be pointed to
high-strength energy sources (such as the sun,
laser transmissions and their reflection sources),
which can have a negative influence on its
accuracy and permanently damage the infrared
detector.
USE AND OPERATION
Functions and Features
LENS
FOCUSING RING
BATTERY
COMPARTMENT
BLINDER
VISIBILITY
ADJUSTMENT RING
ROLLER BUTTON
POWER
BUTTON
LENS
VIDEO OUTPUT
3. 2
Battery Installation
• The thermal imager uses a
single 18650 battery which
should be installed in the
following way
Button Function
S/N BUTTON GRAPHICAL
REPRESENTATION FUNCTIONS
1
2
Power
Button
Roller
Button
Power-on, power off
Press: enter menu/
determine function
Rotation: select function
MODEL
TECHNICAL SPECIFICATIONS
BURRIS THERMAL RIFLESCOPE
Detector
35mm 50mm
Resolution 400×300
Pixel Size 17µm
Optical properties
Focal length 35mm/F1.2 50mm/F1.2
Focusing Manual Focus
FOV 10.7�×8.0�
Imaging
Frame Rate 50Hz
Digital Zoom 2x, 4x
Display
Screen 1024×768 Color OLED
Color Palletes Black hot, white hot, red hot 1, 2, and 3, green hot, blue hot
Magnification
Power
Battery Type 1x18650
Working Time ≥3h standard, ≥5h with 3400 mAh high-output battery
Interface
Mounting Type Picatinny
Video Output 4-pin LEMO
External Connection n/a
7.5�×5.6�
1.7~6.8 2.3~9.2
4. 3
FUNCTION
MENU
STATUS BAR
Power-On
• To start the thermal imager, hold down the Power
Button until the startup display
Display Off
• Hold down the Power Button until the shutdown
progress bar comes up on the eyepiece screen.
Release the button before shutdown progress is
complete and the display will turn off
Power-Off
• Hold down the Power Button to display the
shutdown progress bar on the eyepiece screen.
When the shutdown progress bar is complete,
release the button
Image Interface
Image interface
of the thermal
imager without
function menu
Image interface of the thermal imager with function
menu
5. 4
Function Menu
Press the Roller Button to open the function
menu which appears on the left side of the image.
The function menu provides complete access to
all settings
• Enter the menu - Press the Roller-Button to pop up
the function menu.
• Exit the menu - Select the ʻExitʼ in the menu top,
press the hand wheel to exit the function menu.
• Select Function - Rotate the Roller-Button to the
desired menu and press the Roller-Button to make
adjustments
• Status bar - Shown at the bottom of the image, it
displays the current model, palette and battery
status
Image Adjustment
Image Calibration
During extended use of the thermal imager, the
device will heat up and may cause snow, jitter and
instability of the infrared image. The calibration
mode can be used to correct image and remove
abnormalities.
Before performing scene calibration, make sure that
the lens cover is closed, or the lens is evenly
aligned.
Scene or Shutter Calibration Mode - Press the Power
Button to recalibrate. Before performing scene
calibration, make sure that the lens cover is closed,
or the lens is evenly aligned.
The display will read “Calibration Completed” when
reset is complete.
6. 5
In the Auto-Calibration Mode, the device automati-
cally corrects the image quality without any action
Zoom In
There are four zoom-in modes: 1x/2x/4x and
Picture-In-Picture (PIP). The position of PIP is adjust-
able, see the ʻPIPʼ chapter for details.
When the menu bar is not displayed, rotate the
Roller Button up or down to switch zoom power
modes. The reticle line is synchronized with the
zoom levels.
• 1X - The main screen is displayed in the original
size.
• 2X - The central cursor area of the image is
zoomed to 2 times with full screen.
• 4X - The central cursor area of the image is
zoomed to 4 times with full screen.
• PIP - The main screen displays the original screen
with PIP images magnified by a factor of two are
displayed in the window above the screen.
Color Palette
The riflescope can be set to display infrared images
in a variety of colors making it easier for users to
observe and identify targets. Palette options include:
7. 6
white hot/black hot/red hot 1/red hot 2/red hot
3/green hot and blue hot.
Brightness
There are ten levels (1-10) of image brightness that
can be adjusted to user preference.
Contrast
There also are ten levels (1-10) of image contrast
that can be adjusted to user preference.
Ranging
The ranging function can estimate the distance of a
target by a known target size. Three examples of
targets are available on the device as a reference:
0.25m/0.8 ft., 0.5m/1.6 ft., 1.8m/5.9 ft., and
real-time display of distance information of the three
animals.
Operation
• Press the Roller-Button to enter the menu, select
the ʻRangingʼ and press the knob to enter the
ranging function
• Align the lower horizontal line with the bottom of
the target image, rotate the Roller-Button up or
down to change the width between the upper
and lower horizontal lines until the upper
horizontal line is aligned with the top of the
target icon. At this time, the distance can be
calculated and displayed automatically.
• By comparing the target size with the three
reference animal sizes, the user can roughly
calculate the distance of the target.
Zeroing
Before going afield, the riflescope and thermal
imager must be sighted-in and the reticle zeroed.
Zero-calibration can be performed and saved for six
different models.
For each model, only one zero calibration position
can be stored.
8. 7
The zero-calibration distance of the thermal imager
is automatically set at 100m, but users may select
the zero-calibration distance to their own preference
(i.e. 50 or 200 meters/yards). The principle of zero
calibration for the thermal imager is that the aiming
point on the reticle line is moved to the actual point
of impact
Zero-Calibration Process
• Press the Roller-Button to enter the main menu
and rotate the knob to select “Advanced”
• Press the knob to enter “Advanced Menuʼ and
rotate the knob to select “Model Select.” Choose
the model number and select Return to return to
main menu
• Rotate the hand wheel, select zeroing;
9. 8
• Press the Roller-Button and enter the Zero-
Calibration Distance selection
• Aim at your target and shoot a group of 1-3
shots. Calculate the distance from the actual
point of impact to your aiming point
■ Select the “X” or “Y” direction and move the
center of the reticle to the actual point of
impact. To do this, rotate the Roller-Button to
select the “X” or “Y” axis in the box. Press
the knob to select to enter adjustment
■ Rotate the hand wheel, move the aiming
point in the center of the reticle line to the
actual point of impact
10. 9
• Shoot another group and continue to adjust the
position of the reticle until your actual point of
impact hit your aiming point
• To complete zero calibration, select “Save” and
exit. If do not want to store the zero-calibration
position, select exit without saving and exit
Zero-Calibration.
Advanced Meno
Enter the “Advanced” menu, in order view the
reticle details, the reticle is automatically adjusted
to the center of the screen. When you exit this
menu, the reticle is restored to its original position.
11. 10
Model Select
The thermal imager store zeroing positions of six
models. If the user has stored zero-calibration
positions of several models, it is necessary to select
the model of the current equipment. The thermal
imager will automatically adapt to the selected
model, to precision accuracy.
• Enter the “Advanced” menu, select “Model select,
choose the desired model number and exit.
Reticle type
The thermal imager is equipped with a selection of 10
reticles. Reticle number 1 is shown by default. Reticles
2 – 10 can be selected with the Advanced Menu.
• Enter the Advanced Menu, select ʻReticle Typeʼ,
select from 1-10. The selected reticle will be
displayed in the center of the image. After zero
calibration, the user can use the center of the
reticle line to observe and aim.
12. 11
Reticle Color
The reticle can be set to black or white. To choose a
color, enter the “Advanced” menu, select “Reticle
Color”, chose the color and exit.
Setting Menu
When you enter the “Setting Menu”, the reticle is
hidden. When you exit this menu, the reticle will be
displayed.
Calibration Mode
The thermal imager can be set with different
calibration modes: automatic calibration, scene
calibration, and shutter calibration. In scene and
shutter calibration, you need to exit the menu bar
13. 12
and press the Power Button to perform the calibra-
tion action.
• Auto - The device automatically corrects the
image quality without any action
• Scene - The user manually corrects the image
quality as needed, and the lens cover needs to be
attached before calibration
• Shutter - The user manually corrects the image
quality as needed and the device shutter closes
for calibration
Picture-In-Picture (PIP)
In the Zoom-In mode, the position of the PIP window
can be adjusted. The available positions are left,
middle, and right. You can also turn the PIP window
off. When the PIP window is off, the zoom mode
cycles through 1x/2x/4x. When the PIP window is
on, the zoom mode cycle is PIP/2x/4x
Hot track
When hot track is on, the tracking box will track the
area with the highest temperature in the image.
Screen Brightness
Users can adjust the screen brightness. Enter the
ʻscreen BRIʼ —— to adjust the screen brightness.
Auto-Off
User can set the auto power off time. There are four
options: Off, 15, 30 and 60 min.
Reset
By entering “Settingʼ——Reset”, users can restore the
thermal imager to its factory settings. After a factory
restore, all zeroing data will be lost and you need
re-zero.
Battery Status
A battery status icon is located at the bottom right
corner of the screen. The battery icon is shown in
following table.
14. 13
S/N
1
2
3
4
5
6
ICON BATTERY STATUS
High level
Middle level
Mid-high level
Mid-low level
Low level
Power off level
The thermal riflescope provides reverse battery
connection protection. The battery can be installed
positively or negatively. Before changing the
battery, make sure that the thermal imager is
powered off. With rechargeable battery, be sure to
charge the battery for at least five hours before use.
If you notice overheating, odor or discoloration
or deformation of the battery, discontinue use
immediately.
Common Fault Analysis and Troubleshooting
If your thermal riflescope has performance issues,
the troubleshooting chart below will solve most
problems. If these suggestions donʼt solve the
problem, contact your dealer or Burris Company for
service or repair.
FAULT DETECTION FAULT LOCATING SOLUTIONS
Thermal imager is not
started after
long pressing
of power key
Are batteries
installed correctly?
Open the battery cover to check to
see whetehr the battery is put in
the opposite direction
Are batteries
charged sufficiently?
Take the battery out
for charging
Is battery cover
screwed up?
Screw up the
lens cover
15. 14
Storage and Maintenance
When the thermal riflescope will be not used for a
long time, store the it in a dry, well-ventilated
environment and charge the thermal imager at least
four hours every two months during the storage
The infrared lens of the thermal imager is coated
with an anti-reflection film. Clean the lens only when
dirt or smudges are present. Frequent scrubbing may
damage the lens coating.
To clean non-optical surfaces of the riflescope, do not
scrub with chemical solvents or cleaners. On exterior
surfaces, wipe with a soft and dry microfiber cloth.
FAULT DETECTION FAULT LOCATING SOLUTIONS
After startup, image
quality is poor and blurry
Lens is not
focused
Rotate the lens focusing ring till
the image becoems clear
Image has bright line, black
edge / blurred screen
Image needs
to be corrected
Do shutter /
scene calibration
Image
is blurring
Infrered lens
is polluted
Rotate the lens focusing ring till
the image becoems clear
Interface is
not clear
Use special cloth to
clean the lens
Different distance
is observed
Lens is not
focused
Rotate the lens focusing ring till
the image becoems clear
Eyepieceʼs visibility
is not proper
Lens is not
focused
Adjust the visibility
based on the Manual
Thermal imager, during
use, shuts down suddenly
The battery cover
becomes loose
Screw up the battery
compartment cover
Targeting is still
unsuccessful after multiple
time of calibration
The initial position of
the aim line does not
return to zero
Adjust the initial position of
the aim line to “0”
Precision reduces
obviously during use
The connecting base
becomes loose
Check to see whether the
connecting base is
completely locked.
16. Burris Company • 331 East 8th St.,
Greeley, CO 80631 (970) 356-1670
BurrisOptics.com • Facebook.com/BurrisOptics
10
Warranty
The Burris Thermal Riflescope products are covered
by Limited Warranty and Burris will repair or replace
your product if it is defective. Do not disassemble the
riflescope as this will void the warranty. Contact your
nearest Burris dealer for assistance.
For detailed warranty information scan the QR
codes below.
US Warranty International Warranty
This manual is available in German, French, Italian
and Spanish translations at https:
https://www.burrisoptics.com/sites/default/files/-
content/products/manuals/thermal/riflescope