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When only post-arm readings are specified, an error will occur when the
total number of readings (ARM:COUNt * TRIGger:COUNt) is greater than
524,288 readings. However, an error will not occur if the arm count or
trigger count is set to INFinity, or if the readings are going the VME bus or
Local bus directly from the A/D converter.
When pre-arm readings are included in a measurement sequence with an
arm count > 1, digitizer memory is segmented. When memory is segmented,
the maximum number of arms is 128 and the maximum number of pre-arm
and post-arm readings per arm is 524,288 / (number of arms rounded up to a
power of 2).
Note If the arm count is set to INFinity, use the ABORt command to return the
digitizer to the idle state.
Arm Rate When the arm count is greater than one and the sample rate is derived from
the digitizer’s internal oscillator, the next arm occurs 0.5
µs after the last
reading in the burst. This rate will vary with other references.
Immediate Arming Once the digitizer has been placed in the wait-for-arm state with the
INITiate command, the digitizer can be armed immediately with the
following command, regardless of the arm source:
ARM[:STARt][:IMMediate]
ARM:IMM is also the only way to arm the digitizer when the arm source is
HOLD and the digitizer is in the wait-for-arm state.
ARM:IMM decrements the arm count by 1, and any programmed delay
(other than the inherent delay) is ignored.
ARM Synchronization
Signals
As indicated in the block diagram of Figure 3-5, the arm signal can be
"routed" to the following locations:
"Ext 1" BNC port
ECLTRG trigger lines
TTLTRG trigger lines
118 Understandin
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the HP E1429 Di
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itizer Chapter 3