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cso:instruments:fts:cables [2011-03-08 20:42]
sradford
cso:instruments:fts:cables [2011-03-08 20:43] (current)
sradford
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 +====== Cabling ======
  
 +<​file>​
 +                                CABLES.TXT
 +--------------------------------------------------------------------------------
 +Poliahu-[FTS.TEXT]CABLES.TXT ​ Tacos-[SERABYN.FTS.TEXT]CABLES.TXT ​       01-30-97
 +--------------------------------------------------------------------------------
 +
 +IMPORTANT:
 +
 +TO AVOID IEEE BUS ERRORS, disconnect all IEEE cables beyond the A/D.
 +
 +TO AVOID SPIKES AS MUCH AS POSSIBLE, make sure that there is no ground connection
 +between the computer/​ADC boxes and the metal strips on the table.
 +
 +--------------------------------------------------------------------------------
 +This guide describes the cabling setup for the FTS. The electronic components
 +include the facility bolometer, our FTS Bessel filter box and FTS Trigger Box,
 +the IOtech A/D, the Heidenhain linear encoder, our home-made FTS electronics
 +drive box and MOTOR/​LIMITS box, the Galil motor controller, and the amplifier
 +boxes for the Galil motors. The manuals which describe the equipment inside the
 +FTS electronics box (Heidenhain encoder electronics,​ the switching power
 +supply, and the Precision Micro controller board) can be found in a red binder
 +in the FTS cabinet on the third floor of the CSO. 
 +
 +All the electronics on the FTS optics table are plugged into a power strip on
 +the table. ​ Make sure this is turned on before proceeding.
 +
 +
 +
 + ​  ​      FRONT PANEL CONNECTORS ON FTS ELECTRONICS BOX:
 +
 ++---------------------------------------------------------------------------+
 +|                                                                           |
 +|                                             ​[==6==] ​                      |
 +| ((1)) [===2===] [===3===] ​ [==4==] ​ [==5==] ​                         !    |
 +|                                               ​(7) ​                   *    |
 +|                                                                      8    |
 ++---------------------------------------------------------------------------+
 +
 +1. Heidenhain Encoder ->​ Heidenhain gray cable to linear encoder
 +2.     NOT USED; NOT CONNECTED INTERNALLY
 +3. Antenna Computer ->​ DB-conn. to SERIAL PORT 14 cable
 +4.     NOT USED, and DON'T USE: NOT interchangable with "​Encoder 1 Out."
 +5. Motor Encoder 1 ->​ DB-conn. to gray cable to "​Motor ​
 +                                          Encoder"​ on LIMTS/MOTOR box
 +6. Paddle Box ->​ DB-conn. to cable to manual paddle box
 +7. Motor Drive ->​ BNC cable to "Motor Drive" coax
 +                                          connector on LIMTS/MOTOR box
 +8. Power Switch
 +
 +
 +1.  Fat grey cable (funky European one) to Heidenhain linear encoder on the
 +    translation stage. Inside box -> Heidenhain decoding electronics box.
 +
 +2.  Not connected internally
 +
 +3.  RS-232 communcations from terminal server (cable with D-connector ​
 +    labelled FTS Serial Port 14 wends its way around the back of the sidecab ​
 +    and circuitously makes its way to the LINOTRONIX terminal server under
 +    the Laserprinter).
 +    Internally -> Precision Micro motion controller board. ​ The ribbon cable 
 +    inside the electronics box must also be plugged in to the controller board.
 +  ​
 +4.  Internally to Precision Micro i/o channel 2 =>NOT USED<=
 +
 +5.  Externally to the rotational encoder on the DC motor which drives the FTS. 
 +    Internally -> Precision Micro i/o channel 1. 
 +
 +6.  To paddle box. Internally to Precision Micro i/o channel 1. Paddle toggle ​
 +    switch must be set to "​Board"​ to send controller commands to the motor.
 +
 +7.  Motor Drive: provides the drive voltage for the FTS motor. Internally -> 
 +    Precision Micro i/o channel 1.  The other end of motor coax is connected ​
 +    to the Limit Switch/​Motor Box, whence the signal travels to the hard
 +    limit switches and back before finally being sent to the motor via a pair
 +    of banana pin connectors on the back of the Limit Switch/​Motor Box.
 +    NOTE: Wrap the motor with heater tape to keep it happy in cold weather. It 
 +    should be run off a variac with about 20V output.
 +
 +Note on 5,6,7: On the Precision Micro board, the channel 1 connector has pins 
 +    providing the motor drive voltage, and accepting the input from the motor'​s
 +    rotational encoder. To avoid cross-talk, these two signals are carried ​
 +    externally by two separate cables: as listed above, the encoder is on #5, 
 +    and the motor drive on #7. The paddle box, which also uses the motor drive
 +    voltage, is on #6.
 +
 +
 +
 + ​  ​      BACK PANEL CONNECTORS ON FTS ELECTRONICS BOX:
 +
 ++---------------------------------------------------------------------------+
 +|                                                                           |
 +|                                                                           |
 +|                                                         . .               |
 +|          (1)  (2)                                       ​(3) ​              |
 +|                                                                           |
 ++---------------------------------------------------------------------------+
 +
 +1. Reference Pulse Out -> BNC to FTS Trigger box to A/D ch 2 
 +2. Trigger Pulses Out           ​-> ​     BNC to FTS Trigger box to A/D trigger
 +3. AC Power cord                ->      Clean (ORANGE) AC outlet
 +
 +1.  Reference pulse out on BNC. Internally from Heidenhain decoding box. 
 +    -> Ref In on FTS Trigger Box, then out of Ref Out on same box, and
 +    -> IOtech A/D channel 2 
 +
 +2.  Trigger pulses out on BNC. Internally from Heidenhain decoding box. 
 +    -> Trig In on FTS Trigger Box, then out of Trig Out on same box, and
 +    -> External Trigger BNC on back of IOtech A/D
 +    Both Trig In & Trig Out are sent to an oscilloscope.
 +
 +--------------------------------------------------------------------------------
 +                      MOTION CONTROLLER HAND PADDLE
 +
 +                                   ||
 +                            +------++------+
 +                            |      Up      |
 +                            | (1)  !       |
 +                            |     ​Down ​    |
 +                            |              |
 +                            |      /\      |
 +                            | (2) (  )     |
 +                            |      ^^      |
 +                            |              |
 +                            |    Manual ​   |
 +                            | (3)  !       |
 +                            |    Board     |
 +                            +--------------+
 +
 +3. -Switch to toggle between manual and computer operation. ​ To accept commands
 +    from the antenna computer/​FTS program, this switch MUST be set to "​Board"​.
 +2. -Speed control knob for manual motion control.
 +1. -Motor enable switch. ​ When (3) is set to "​Manual",​ pushing this switch up 
 +    drives the translation stage upward. Pushing this switch down, downward.
 +    (Up is toward the beamsplitter).
 +
 + ​--------------------------------------------------------------------------------
 +                              LIMIT SWITCH/​MOTOR BOX
 +
 +                                                   Mtr+ Mtr-
 +                                                     ​o ​  o
 +                           ​----------------------------------+
 +                          /                                 /|
 +                         / ​                                / |
 +                        /                                 / ​ |    Encoder
 +                       ​----------------------------------- ​  |
 +                       | hard limits ​      soft limits ​  ​| ​  | <-  [====]
 +                       ​| ​  ​o ​   o            o    o  (-) |   |
 +                       ​| ​                    ​o ​   o  (+) |   |
 +                       ​| ​                                ​| ​  |
 +                       ​| ​                                ​| ​ /
 +                       ​| ​    ( )             ​[======] ​   | /
 +                       | Motor Drive       Motor Encoder |/
 +                       ​----------------------------------+
 +
 +The "Motor drive" and "Motor encoder"​ connectors are cabled to the
 +corresponding connectors on the FTS electronics box.  Encoder and motor cables
 +are kept separate to avoid crosstalk. ​ The Motor+ and Motor- banana connectors
 +and encoder connector in the back of the box must also be plugged into the
 +motor. There are two sets of limit switches on the stage: hard and soft.  Hard
 +limits cut off all power to the motor when they are tripped. ​ In contrast, the
 +soft limits are connected to the Motion controller card inside the FTS
 +electronics box via the motor encoder cable, and allow the stage to be stopped
 +by software before it reaches the point of no return. ​ Make sure top (+) and 
 +bottom (-) limit switches are plugged in to their appropriate sockets. ​
 +--------------------------------------------------------------------------------
 +
 +          FTS TRIGGER BOX (in control room; power switch in back)
 +
 +   ​-Trigger In & Reference In from the FTS electronics box via BNCs which
 +    go through the air vent. Trigger In also to oscilloscope.
 +   ​-Trigger Out to IOtech A/D External Trigger via BNC. Also to oscilloscope.
 +   ​-Reference Out to A/D channel 2 via BNC. 
 +   -NOT USED WITH NEW 10 MICRON ENCODER: Sample Select from back of IOtech D/A 
 +    via special BNC cable with edge connector. Provides 0 or 5 V depending on
 +    20 or 10 micron sampling, respectively.
 +--------------------------------------------------------------------------------
 +
 + FTS BESSEL FILTER BOX (in control room; power switch in back)
 +
 +   -IN: raw signal from "​Bolometer"​ coax 
 +   -OUT: filtered signal to A/D channel 1
 +   -Zero DC offset and select 3 dB frequency cutoff using the two knobs.
 +
 +The Bessel filter is normally set to 80 Hz. The 6-pole Bessel filter provides
 +maximally flat phase response. The Bessel filter box also includes a 20 kHz
 +1-pole RC low pass filter to try to eliminate high freq. spikes. It can be
 +removed if desired. The signal from the Bessel filter is inverted by FTSRUN. ​
 +--------------------------------------------------------------------------------
 +
 +        IOTECH A/D model ADC488/16A (in control room)
 +
 +     Used in differential mode.
 +
 +     16 bit, -5 to 5 V A/D (corresponding to +/- 30000 DN). 1 bit = 0.167 mV.
 +     Uses IOtech model SCSI488/D to convert from SCSI to IEEE488/​GPIB.
 +     Use the short GPIB cable: * LONG GPIB CABLES GIVE IEEE ERRORS *
 +     Dip switches inside A/D: S102-open, S103-closed,​ but it matters little.
 +
 +    -External Trigger In from Trig Out on FTS Trigger Box via BNC
 +    -D/A output on edge connector to Sample Select on FTS Trigger Box via BNC. 
 +     Uses hybrid edge-connector/​BNC thing.
 +
 +    -Analog Inputs: Channel 1 = Bolometer Channel 2 = Ref Pulse
 +
 +     Use special D-connector to 2 BNC cable thing. Each channel has three pins
 +     ​available:​ Hi, Lo, and Ground. The connector is wired so that for channel
 +     1 only, Lo and Ground are shorted together. Since the bolometer and Bessel
 +     ​filter box both float, the bolo ground is thus defined at the A/D input. ​
 +
 +  Pins in 1: Ch 1 Hi 15: Ch 2 Hi
 +D-connector:​ 2: Ch 1 Lo 16: Ch 2 Lo
 + 14: Ch 1 Ground, tied to 2 3: Ch 2 Ground: no connection
 +--------------------------------------------------------------------------------
 +
 +          GALIL CABLING
 +
 +The Galil is currently mounted on the LINOTRONIX terminal server port 2. The
 +terminal server is connected to the back of the Galil Control box in the
 +sidecab. A thick gray cable sends the signals from the control box (via a
 +iconnector on its backside marked "​holo"​) to the amplifier box (via its "Galil
 +Control"​ connector) which, along with its transformer box, is mounted on the
 +FTS optical table. The only cable to be disconnected from these boxes is the
 +"Galil Control"​ cable, which comes through the hood on the platform. Always
 +leave all other cables connected to the two Galil boxes, even in storage. ​
 +    ​
 +From the amplifier box, 4 cables (2 pairs) go to the DC motors which drive the
 +rotating mirror. Each pair of cables consists of an encoder cable to the DB
 +connector on the bracket, and a motor drive cable, which first splits into a
 +pair of black and white wires, and then goes to two separate "​slip-on"​
 +connectors. The correct motor/cable combinations are marked with Y & Z on the
 +cables and on the FTS bracket. The labels "​black"​ and "​white"​ are also written
 +on the motors near the correct slip-on connectors. ​
 +--------------------------------------------------------------------------------
 +
 +     ​  ​      ​BOLOMETER CABLING
 +
 +    The bolometer "​output"​ signal is transported via a BNC cable to the control
 +room through the air vent and above the ceiling panels. Normal gain for low
 +frequency filters is 5000. The signal is first sent to the low-pass Bessel
 +filter box. After filtering, the bolometer signal goes into channel 1 of the
 +IOtech A/D via the 2-BNC to D-connector thing. The signal is also T'd off at
 +the input to the A/D and sent to the strip chart, which is used for pointing.
 +Disconnect the strip chart for observing! ​
 +
 +For operation of the bolometer with the FTS, the preamp gain should normally be
 +set to 5000. However, FTSRUN will inform you if it wants a different setting
 +for a given gain. It is important to remember to 
 +
 +               !!!! CHANGE AMP BATTERIES EVERY 6-8 HOURS !!!! 
 +
 +The preamp batteries need only be changed once every few days. The capacitor in
 +the high pass filter inside the bolometer has been changed, to lower the
 +filter'​s cuton frequency (to flatten the phase in the passband). A 33 microfarad ​
 +capacitor is soldered in parallel with a 10 microfarad capacitor already in the 
 +preamp to give a time constant of 0.4 sec, or a cuton frequency of about 0.4 Hz. 
 +This is now left in place for all bolometer observing. In addition, for FTS 
 +spectroscopy,​ we also add a clip lead with 50 muf, to lower the cuton to 0.1 Hz.
 +
 +</​file>​
cso/instruments/fts/cables.txt · Last modified: 2011-03-08 20:43 by sradford
 
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