SOP FS1001A Tuning

From PTAGISWiki

	Standard Operating Procedure
Subject:	SOP FS1001A Tuning
Author:	Darren Chase
Approved by:	Don Warf

Contents 1 Objective 2 Scope 3 Responsibilities 4 Tools Required 5 Procedure 5.1 Course tuning 5.2 Fine Tuning 5.3 Final Transceiver Settings for operation 5.4 Notes 6 References

Objective

This procedure is to ensure that the calibration process of the FS1001A is consistently performed and accurate regardless of whom the installer maybe within the PTOC group.

Scope

This calibration procedure is limited to the FS1001A Adult transceiver relating to a new installation.

Responsibilities

It will be the responsibility of the technical installer assigned to a project to follow this process in its entirety in order to certify the installation prior to the facility actively interrogating Pit-tagged fish.

Tools Required

The following tools or equivalents will be required to perform this procedure.

• Fluke 192C Scopemeter or equivalent
• Fluke 87III True RMS Multimeter
• Potentiometer adjusting tool (Tweaker)
• Tektronix Current Probe P6021
• Agilent 10436B 10:1 scope probe
• TXI400BE test stick or equivalent

Procedure

Course tuning

1. Voltage setting
   • Place DVM test leads on the +VE and 0VE test loops located on the left side of the transceiver. (Reference picture for location.)
     
   • Adjust RP-2 (Reference picture for location) for a DVM reading of 13.5 VDC +/- 200mV. This will only be a nominal setting and may require further adjustments given the physical characteristics of the installation.
     

   

   Exciter Voltage Adjustment

2. Set the position of the variable capacitor.
   
   • Rotate the vari-cap fully counter clock wise. CCW position adds capacitance to the circuit.
     
   • Rotate the vari-cap 2 complete turns clock wise. CW subtracts capacitance from the circuit. This will be the starting position.
     
3. Jumper Matrix Selection.
   
   • Using the Fluke ScopeMeter 192C, attach the Tektronix current probe, pt# P6021, to the orange wire located on J2. (Reference Picture for location)
     

   

   Current Probe

   • Start by removing jumpers located at the top of the matrix that are associated with the least amount of capacitance. Refer to matrix chart below.
     

   

   Capacitor Selection

   • While continuing to remove jumpers, watch trace B, blue in color on the oscilloscope, for a significant increase in amplitude (see note 1).
     
4. Exciter Tuning Capacitor
   
   • Now that the jumpers have been selected to maximize the amplitude you will use the Exciter Tuning capacitor to peak the current further. Watching the scope display you can adjust the variable capacitor in either direction but if the direction you start causes the current on the scope display to decrease adjust the capacitor in the opposite direction. Continue adjusting the variable capacitor until the current peaks and then starts to decrease. You should be able to peak the current and have adjustments in both directions of the variable capacitor.
     
   • If you continue in a direction to achieve the peak and run out of adjustment it may be necessary to add or subtract 1000pf using the jumpers. The direction you are turning the variable capacitor will determine if you add or subtract capacitance, If you are adjusting in the Counter Clockwise direction you will need to “add” if you are adjusting in the Clockwise direction you will need to “subtract” capacitance.
     
   • You will need to return the Exciter Tuning Capacitor to the peak current on the display (see note 2).
     
   • After you have peaked the current you may need to calibrate the display on the transceiver LCD to match the current readings on the scopemeter. This display can be found by hitting the enter key from the main or scan menu, there are three titles displayed
     1. Phase- This shows the exciter drive/antenna phase (%).
        
     2. Signal – This is the level of signal at the reader input.
        
     3. Current – Indicates the current in the antenna (peak to peak Amps).
        

   If the displays do not match you can calibrate the LCD display by using the “Current Gain” sub-menu which is located under the “Diagnostic” primary menu (see note 3). The default “current gain” percentage is 100% to decrease the LCD display down adjust the number below 100 and adjust above 100 to increase the display. Once the displays have been matched you can use the LCD for future Current readings.
   

5. Remove the current probe from the orange wire.
   

Fine Tuning

1. Equalization Circuit - Before doing any of the following steps for fine tuning you must change some of the “default” settings on the transceiver. You need to turn “unique” off and the “buzzer” both sub-menus are located under the “Reader” primary menu (see note 3).
   
   • Turn power off and remove the three screws holding down the Virtual Timer Tag (VTT) board located on the analog board. Allow the VTT board to hang by the wires that are connected to the pick up coil. Remove the aluminum RF shield to reveal the potentiometer for the Equalizer and Comparator circuits . (Reference picture for location)
     

   

   Equalizer Circuit

   • Insert the agilent scope probe into the PTP1 test point on the analog board and turn the transceiver on.
     
   • Set up for the scope is as follows:
     • Scope Channel A
     • Coupling AC
     • Measure Peak to Peak
     • 500mV/Div
     • Sweep 5mS/div
   • Place the Equalization Calibration Tool onto the transceiver. The test tag should be reading and the buzzer should audible and almost constant in tone.
     
     • View the signal on the scopemeter and adjust RP2 on the analog board Counter Clockwise until the tag stops reading. The waveform should appear to have two signals one being lower in amplitude than the other. Begin adjusting RP2 clockwise while watching the waveform on the scopemeter. Adjust RP2 until the signals are equal in amplitude. You want to adjust RP2 so that there is very little gap between the AM modulated signal. As you approach equal amplitude for both signals you will hear the buzzer begin to become almost monotone with almost no hesitations. (Reference Picture)
       

   

   FDXB Signal

   • Turn the transceiver off and remove the Equalization Calibration Tool and re-assemble the RF shield and VTT board. Make sure that the SW1 on the VTT board is set to the “on” position.
     
2. Comparator Adjustment
   
   • Turn the transceiver on. Locate RP1 on the analog board and adjust 10 full turns Counter Clockwise, adjust 3 full turns clockwise.
     
   • Verify the signal from the PTP1 test point with no tag in the field has a peak to peak signal less than 200mV.
     
   • Remove the probe from PTP1.
     
3. Virtual Timer Tag
   
   • Before making adjustments to the VTT you will need to turn off the buzzer in the Reader Menu and turn on the Test Tag in the Diagnostic Menu.
     
   • While viewing the Hit Rate on the LCD adjust the potentiometer RV1 Counterclockwise until the Hit Rate is approximately 85% (see note 4).
     
   • Adjust the Exciter Tuning Capacitor to maximize the reading percentage on the display, Since you have tuned Exciter Tuning Capacitor you should be close to the maximum reading possible.
     
   • Adjust RV1 on the VTT board until the hit rate is at 100%. Shut and latch the door on the transceiver, view the Hit Rate, if it falls below 100% adjust the Exciter Tuning Capacitor Counter Clockwise approximately 1/8 turn and shut and latch the door repeat this step until you have reached 100% with the door shut and latched (see note 5).
     
   • Turn the test tag off.
     
   • Make sure that you use the selection underneath the Diagnostics menu to turn the Timer Tag off and that the switch on the VTT board is left in the On position.

Final Transceiver Settings for operation

After the transceiver has been tuned there are some settings that need to changed from the default settings for PTOC operations they are listed below.

1. Reader menu
   • 1. Unique to OFF
     2. Buzzer to OFF
        
2. Diagnostic Menu
   • 1. Current Alarm Threshold to 300mV below the current displayed with the door shut.
     2. Test Tag Delay to 60 minutes.
     3. Report Delay to once per file, if the file duration was 3 hours the delay would be 180 minutes.
     4. Noise Delay to 0000.
        

Once the transceiver is tuned and the settings have been changed you can view what PTOC personnel call the tuning menu by hitting the enter key from the Main or Scan menu. There are three settings displayed they are Phase, Signal, and Current.

Notes

NOTE 1: Because you will want to remove the capacitance in very small amounts to ensure that you are peaking the current and did not pass over the peak you will need to keep track of the total capacitance remaining after removing a jumper. If the 10,000 pf capacitor is the last remaining cap in the matrix and needs to be removed, you should replace it with enough jumpers to give a value as close to 10,000pf as possible. The same theory should be followed when replacing the 4700’s and 2200pf capacitors.

NOTE 2: It may be necessary to adjust the scopemeter volts/div for better screen sensitivity while adjusting the variable capacitor.

NOTE 3: The procedure for stepping through the menus of the transceiver is described in detail in the Destron-Fearing FS1001A User Manual Section 5 – Menu Structure and Operation.

NOTE 4: The LCD display refresh rate is 4 seconds so when you are adjusting the hit rate you need to let the display refresh before you make any other adjustment.

NOTE 5: The door has a loading effect when shut and latched. The loading varies from transceiver to transceiver so the adjustment to the Exciter Tuning Capacitor can also vary. The loading however does change the tune in the same manner for each transceiver and that is it will take the phase further clockwise on the Exciter Tuning Capacitor so to combat the loading the Capacitor has to be adjusted counter clockwise the amount that the door changes the Phase in the clockwise rotation.

References

No references were required for this procedure.