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D.3 Temposonics II Digital System Signals
Figure D-1
Digital System signals
D.4 Wiring Check
Improper wiring can cause either an erratic output or complete loss of output signal. The following
instructions should be followed to check all connections.
1. Disconnect or remove DC power to the system.
2. Trace all wiring from the counter card to the transducer. Ensure that maximum cable length and type is
observed.
3. Check system grounds. Figure D-3 shows a typical circuit diagram with the required and optional
grounds. Ensure that circuit ground is made at only one location to avoid ground loops. If erratic or
unstable output is encountered, recheck all earth grounds and cable grounds.
4. Disconnect transducer from the DIB while the power is off.
5. Connect the J1 connector to the DIB and restore power.
6. Check for the voltages listed below on the J2 (6-pin) connector on the DIB with respect to J2, pin-B
(Ground).
A = +12 to +15 Vdc
D = -13 to -15 Vdc
F = +11.5 to +12 Vdc
20µs 15µs
(+) Interrogation pulse sent to LDT (pin 10)
(-) Interrogation pulse sent to LDT (Pin 9)
RS422 (-) Start/Stop (pin 3)
RS422 (+) Start/Stop (pin 4)
DPM (-) Gate Out (pin 3)
DPM (+) Gate Out (pin 4)
Return Pulse from LDT (pin 8)
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