Model 2701 User’s Manual FORMat and Misc SYSTem Commands 14-3
For buffer readings recalled from the front panel, the relative timestamp is referenced to
the first reading stored in the buffer (absolute format) which is timestamped at 0 seconds
and to the time between each stored reading (delta format). For remote programming, you
can only return the absolute or delta timestamp. The following command is used to select
relative timestamp format for the buffer:
TRACe:TSTamp:FORMat ’ Select timestamp format; ABSolute or DELTa.
Reading number — The reading counter starts at zero when the Model 2701 is turned on.
When returning buffer readings using TRACe:DATA?, each reading will be referenced to
the first reading, which is #0. The following command will reset the counter:
SYSTem:RNUMber:RESet.
Channel number — The channel number indicates the switching module channel for the
reading. Channel number 000 indicates that no channel was closed.
Limits — For the ASCII data format, limit test results are returned as a 4-bit binary
number “abcd” where:
a = High limit 2
b = Low limit 2
c = High limit 1
d = Low limit 1
A “0” indicates that the limit has passed, while a “1” indicates that the limit has failed.
For the binary data formats, the limits information must be decoded from the returned
value (0 to 15). Convert the value to its binary equivalent for “abcd” where “d” is the LSD
and “a” is the MSD. For example, the value 10 converted to its binary equivalent is1010.
That means High Limit 2 and High Limit 1 have failed.
Figure 14-1
ASCII data format
+1.23456789E-03VDC, +11.664SECS, +236RDNG, 000, 0000LIMITS
Reading* Timestamp
Units
Channel
Number
Limits
Code
Reading
Number
Units:
VDC = DC Volts
VAC = AC Volts
ADC = DC Current
AAC = AC Current
OHM = 2-Wire Resistance or Continuity
OHM4W = 4-Wire Resistance
*An overflow reading is displayed as +9.9E37 with no limits.
Units:
HZ = Frequency
SECS = Period
C = Temperature in C
F = Temperature in F
K = Temperature in K
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