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MODEL M550 |
CAMAC 8-CHANNEL
LVDT SCANNER
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- Conditions eight LVDT-type position transducers.
- Self-scanning with onboard microprocessor.
- Presents scaled, normalized position data to the CAMAC dataway.
- 16-bit resolution with programmable noise filtering.
- Single-width CAMAC module.
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The Model M550 is a single-width CAMAC module which will acquire position data from up to eight LVDT (linear variable differential transformer) position sensors. The LVDT sensors are excited by an ultrastable synthesized sinewave generator, and conditioned by a precision 16-bit A/D converter followed by digital signal processing. The resident microprocessor supervises scanning and signal conditioning, and places updated position data in CAMAC-accessible dual-ported data registers for instant access from the CAMAC dataway. |
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The M550 provides 16-bit resolution, allowing submicron measurement with commercially available LVDTs. Users may select a range of DSP filtering factors to trade off position noise against acquisition rate.
The M550 provides unprecedented signal acquisition accuracy. Total RMS error (including absolute error, noise, and all drifts) is typically under 1.5 LSBs, equivalent to less than 25 PPM of full-scale span. |
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MODEL M550 CAMAC LVDT DATA ACQUISITION MODULE SPECIFICATIONS |
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| CONFORMANCE |
Meets all mandatory requirements of IEEE-583-1982 CAMAC specifications. |
| PACKAGING |
Single-width CAMAC module. |
| LVDT DRIVE |
- Standard 3 volts RMS, 2.4 KHz; other levels and frequencies available. Drive is differential to minimize capacitive error effects. Wiring shorts on any channel will not damage the module or disturb measurements of other channels.
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| RESOLUTION |
16 bits |
| ACCURACY |
Better than ±50 PPM. |
| STABILITY |
Temperature influence < 1 PPM per °C; Long-term drift < 4 PPM per year. |
| SCAN TIME |
Time to scan all eight channels varies from 84ms to 1.8 seconds depending on user-selected filtering factors. |
| DATA FORMAT |
Signed, two's complement 16 bit data. |
| CONNECTOR |
Two front-panel mounted female DB-25s, five leads per LVDT. |
M550 COMMAND
STRUCTURE |
| F(0) A(n) |
Read LVDT position, channel n (n=0 to 7) |
| F(0) A(n+8) |
Read LVDT parameters |
| F(16) A(n+8) |
Write LVDT parameters |
| F(1) A(n) |
Read LVDT secondary voltage |
| F(1) A(9) |
Read phase angle |
| F(1) A(10) |
Read scan counter |
| F(1) A(12) |
Read module type |
| F(1) A(13) |
Read firmware ID |
| F(1) A(14) |
Read firmware revision |
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| All CAMAC data transfers are 16 bits: Z * S2 reset is switchable. |
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Highland Technology Model M550 8-channel LVDT Data Aquisition CAMAC Module Data Sheet |
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