Installation Procedures for the InstroTek Universal Base
Fig.2
Board (UBB)
June 24 2013
The UBB is designed as an easy replacement for Troxler models 3411, 3430, 3440
baseboards as well as the InstroTek 3500. Certain tools are required to install and setup
the UBB for it to function correctly. The InstroTek warranty on this product requires that
only authorized, trained service personnel familiar with these types of products conduct
the installation and setup. Once the UBB is installed, the gauge should be re-calibrated or
verified according to ASTM D2922.
Model 3401 and 3411 Baseboard Installation are covered in Section A
Model 3430 and 3440 Baseboard Installation are covered in Section B
InstroTek Model 3500 Baseboard Installation are covered in Section C
Electronic Adjustment and Setup Procedure are covered in Section D
Tools Required:
• Soldering iron and solder
• De-soldering iron or solder remover (3411 only)
• Phillips screwdriver
• 5/16” nut driver
• Small jewelers screwdriver or Potentiometer adjusting screwdriver
• Oscilloscope
• Digital multi-meter (DMM)
• High voltage probe
SECTION A – Installing the UBB in a 3401 or 3411 Gauge:
Use the following parts from the existing 3411/3401
gauge along with your new UBB to complete this
task
1- GM tube holders and screws(2)
2- GM tubes with nylon spring supports and
springs (2 each)
3- He3 tube (1)
4- metal base plate (1)
5- Copper grounding spring (2)
6- Curved He3 tube support and screw (1each)
7- Screws and washers that attach circuit board
to metal plate.
8- Screws and washers that attach baseboard
assembly to gauge
1
Fig. 1
Fig. 5
Disassembling the existing baseboard:
1. Turn off the gauge and place the gauge on a
standard block. Remove the top shell,
disconnect the batteries, discharge the high
voltage and remove the existing baseboard
and metal plate assembly.
2. Remove the He3 tube from the assembly by
removing the curved support bracket and
then pulling the tube downward away from
the baseboard.
3. Use a 5/16 nut driver to remove the screws
securing the GM tube holders. The GM
tube holders are slotted and are held by the
metal plate. One end of the GM tube holder
will still be connected to the baseboard by
soldered resistors. Slide off the other one
and remove the tubes. Figs 1, 2 and 3.
4. Do not discard the copper grounding
springs, as they are needed with the new
UBB assembly.
5. The nylon spring supports and small coil
springs are located in the resistor connected
end of the GM tubes and may drop out if the
tube is turned downward during removal.
Save these.
6. Separate the metal base plate from the
baseboard by removing the screws on the
top of the baseboard.
7. Slide the metal base plate off the remaining
GM tube holder.
8. From the top of the board, use a de-
soldering tool to disconnect the resistors
from the baseboard. This will allow you to
remove the remaining GM tube holder from
the old baseboard.
9. You are now ready to assemble your new
UBB board.
Assembling the new UBB baseboard:
1. Remove the metal cover from the UBB by
removing the screws.
2. Locate the 3 groups of jumpers on the UBB.
Fig 5.
Fig.3
Reuse these parts
Fig.6
2
3. The groups of jumpers are marked as
Fig 6b
S4
S6
“3411” “3430” or “3440/ 3500” switches.
4. To configure the UBB for operation as a
3401/3411baseboard, only the group of
jumpers marked as 3411 switches need to
remain shorted by means of the jumpers.
Carefully remove all of the jumpers from
the groups marked as 3430 switches and
3440/3500 switches by cutting them with
wire cutters.
5. Locate the groups of jumpers marked S4 and
S6. Leave the jumpers marked 3411. Cut
the jumpers marked 3500/3430.Fig 6b
6. Place one copper grounding spring between
the bottom side of the UBB and the GM
tube holder with the resistors. Ensure the
resistor leads from the GM tube holder
extend through the solder holes of the UBB.
Secure the GM tube holder with the
mounting screws. Solder the resistor leads
to the UBB at GM1 and GM2 points. Fig.6.
7. Slide the metal base plate into the grooves
on the GM tube holder.
8. Secure the UBB to the metal base plate with
the screws taken out.
9. Place the GM tubes into the secured GM
tube holder making sure the end of the GM
tube with springs and nylon spring supports
are the end inserted into this connector.
10. Install the other copper ground spring and
GM tube holder by sliding it onto the metal
base plate and securing it to the UBB with
the appropriate screws. Fig. 7 and 8.
11. Reinstall the He3 tube and mounting
bracket. Fig.9.
12. Place the complete assembly back into the
gauge and secure it with the appropriate
screws.
13. Connect the batteries and control board
(front panel) to the UBB.
14. The UBB assembly is now complete and
ready for electrical adjustment and setup.
15. Proceed to Section D.
Fig.7
Fig.8
Fig.9
3
Loading...