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DP5 Programmer‟s Guide Rev A4
5.1.43 RTDD - Set Custom RTD Oneshot Delay
Command:
Parameter:
Units:
Default:
Range:
RTDD
[###]
decimated clocks
none
1 - 127
Dependencies: RTDE must precede RTDD
Supported:
FW6.00 and later
Related:
RTDE, RTDS, RTDT, RTDW
Description:
RTDD is used to fine-tune the timing of the RTD logic. It may be needed for events with
very slow risetimes, or configurations where the shaper produces a non-trapezoidal/cusp
shape. For these events, the peak of the shaped event may not occur when it is expected.
The standard RTD timing parameters are calculated when the RTDE command is
received, so the RTDW & RTDD commands must come after RTDE, so that they can
override the standard timing.
To fine-tune the RTD timing:
1. Use DACO=SHAPED and AUO2=5 (for RTD_ONESHOT). Use an oscilloscope to
view both signals. Trigger on either.
2. Use the parameters for RTDW and RTDD to adjust the width and delay of the
RTD_ONESHOT signal – it should bracket the time during which the peak occurs for a
variety of pulses.
Errors:
An INVALID PARAMETER error will be returned if the parameter is not in the range
specified.
Example:
RTDD=60;
Amptek Inc.
// Override the standard RTD timing – set the
// RTD Oneshot delay to 60 decimated clocks
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