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3.11
Measurement Control Codes
3.11.1 The 2251A offers a number of features which assist in setting up measurement features.
Enables Continuous measurement mode
Enables Single (One-Shot)measurement mode
Trigger a measurement (T1 mode) or start a Totalize
measurement
Stop Totalize Measurement
Read current value of totalize measurement in progress
Math function Disable/Enable
Stop Delay Disable/Enable
Average a sample of 100 Disable/Enable
Special function Disable/Enable
Reset measurement
NOTES:
1.
In continuous measurement mode, the output buffer is updated at the end of
each gate period. If the buffer is being read when the gate period ends,
updating is delayed until reading is complete.
2.
In single-measurement mode, the output buffer is cleared every time a T2
command is received.
3.
In making manual totalize measurements, T2 and T3 commands are used with
the TA command with Special Function 61 enabled. In this mode, the
reading executed in successive totalize periods are cumulative; (the RE
command resets the count to 0 when required).
4.
The RF command is sent during manual totalize each time a reading is
required, before the T2 command has been sent to stop the totalize
measurement.
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Table 3.12 - Measurement Control Codes
Function
Code
T0 (See NOTE 1)
T1 (See NOTE 2)
T2 (See NOTE 3)
T3 (See NOTE 3)
RF (See NOTE 4)
MD/ME
DD/DE
NA/AE
SFD/SFE
RE
3-15
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