4
Remote Operations Using the IEEE 488 Interface
Triggering and Reading Operations
If no trigger has been received to generate a conversion of the input signal, then the
response to this command will represent the most-recent measurement. If a trigger has
already been received, this query will wait for the completion of the measurement before
placing the result in the output queue.
The value represents the applied signal together with any mathematical modifications
selected with the Math facility. Overload is represented by a value of ±200.0000E+33
and the O-L bit set in the measurement event status register.
Power On and Reset Conditions
All previous results are cleared at power ON and Reset.
Frequency Readings
FREQ?
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Reading Recall - Frequency Readings
FREQ?
(Nr3) Recalls the frequency associated with the most-recently triggered measurement.
A value of 200.0000E+33 is returned if the measurement circuits cannot produce a result.
If no trigger has been received to generate a conversion of the input signal, then the
response to this command will be the frequency of the most-recent measurement. If a
trigger has already been received, this query will wait for the completion of the
measurement before placing the result in the output queue.
Access to the Internal Buffer Memory
Set and Arm Block Measurement Mode
BLOCK
phs
Nrf
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Set and Arm Block Measurement Mode
BLOCK
Arms the measurement system diversion of measurements to the internal buffer store, and
enters the required number of diverted results.
Nrf
A numeric value for the number of measurements to be stored. This value must lie
between 1 and 6000 measurements inclusive. Note that numbers will be rounded to an
integer.
Putting Readings into Memory
Readings are placed into consecutive stores numbered from 1 to 6000. An example for a
block of 16 readings is given below:
stores 16 readings
BLOCK 16
First reading Last reading
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
22
. .
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Block of 16 readings
4-37
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