IEEE-488 Reference
4-189
Description These commands are used to program the negative transition (NTR) registers. A negative tran-
sition is defined as a 1 to 0 state change in the condition register. Thus, when an event is pro-
grammed for a negative transition, the appropriate bit in the corresponding event register will set
when the corresponding bit in the condition register changes from 1 to 0. For example, if bit B9
of the Negative Transition Register of of the Measurement Transition Filter is set, then the buffer
full event is programmed for a negative transition. The BFL bit (B9) in the Measurement Event
Register will set when the trace buffer is no longer full. For details on register structure, see para-
graph 4.6.
The NTR registers are shown in Figures 4-34B through 4-39B. Included is the decimal weight
of each bit. The sum of the decimal weights of the bits that you wish to set is the parameter
(<NRf>) that is sent with the command. For example, to program RAV (B5) and BFL (B9) mea-
surement events for negative transitions, send the following command:
:stat:meas:ntr 544
where; BFL (bit B9) = Decimal 512
RAV (bit B5) = Decimal 32
<NRf> = 544
Effects of negative transitions on the Measurement Event Register:
Negative transition effect on
Measurement event Measurement Event Register
Reading overflow Sets B0 when a reading has gone from overflow to normal.
Low limit 1 Sets B1 when the reading is no longer less than the low limit 1 setting.
High limit 1 Sets B2 when the reading is no longer greater than the low limit 1 setting.
Low limit 2 Sets B3 when the reading is no longer less than the low limit 2 setting.
High limit 2 Sets B4 when the reading is no longer greater than the high limit 2 setting.
Reading available Sets B5 when the next reading is being taken.
Buffer available Sets B7 when the trace buffer has become empty.
Buffer half full Sets B8 when the trace buffer is no longer half full.
Buffer full Sets B9 when the trace buffer is no longer full.
Buffer pretriggered Sets when the trace buffer pretrigger operations are completed.
Effects of negative transitions on the Questionable Event Register:
Negative transition effect on
Questionable event Questionable Event Register
Temperature summary Sets B4 when a valid reference junction measurement follows an invalid
reference junction measurement.
Calibration summary Sets B8 when an invalid calibration constant clears after a successful
calibration.
Command warning Sets B14 when a Signal Oriented Measurement Command parameter
executes correctly after a previous Signal Oriented Measurement Com-
mand parameter has been ignored.
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