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cso:instruments:fts:cables [2011-03-08 20:42] 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> |