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3-15
3.11
Measurement Control Codes
3.11.1 The 2251A offers a number of features which assist in setting up measurement features.
Table 3.12 - Measurement Control Codes
Function
Code
Enables Continuous measurement mode
T0 (See NOTE 1)
Enables Single (One-Shot)measurement mode
T1 (See NOTE 2)
Trigger a measurement (T1 mode) or start a Totalize
T2 (See NOTE 3)
measurement
Stop Totalize Measurement
T3 (See NOTE 3)
Read current value of totalize measurement in progress
RF (See NOTE 4)
Math function Disable/Enable
MD/ME
Stop Delay Disable/Enable
DD/DE
Average a sample of 100 Disable/Enable
NA/AE
Special function Disable/Enable
SFD/SFE
Reset measurement
RE
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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