HP E8402A, User And Service Manual, Page: 169 / 249

Programming the Enhanced Monitor 171
Chapter 3
Comments
•
Data is stored every 10 seconds over a 1 hour period. The first integer in the
data block is the most recent reading. Integer data values retrieved by the
TRACe?
query are scaled to obtain useful information. The conversion
formula are:
-- Measurement conversion:
-- Time conversion:
•
TRACe:PREamble should always follow its trace data. Otherwise, the xorigin
is undefined.
Error Conditions
The following table lists the most common error conditions and causes. Error
numbers and corresponding messages can be found using
SYSTem:ERRor?
query.
Reset Condition
*RST has no effect on the TRACe data.
Related
Commands
TRACe?, TRACe:POINts?
TRACe:POINts?
<
name
>
TRACe:POINts?
returns the number of points in the <name> trace. This same data
is available through
TRAC:PRE?
At this time, 360 points are kept for each trace
except the external 5Vdc supply (P5EXt). Refer to TRACe[:DATA]:PREamble for
detailed information.
measurement data value
(
y
reference
)
– y
inc rement
]
y
origin
+
× (
=
time data point number x
refer ence
)
–
( [
x
incre ment
]
x
or igin
+
×
=
Number Message Probable Cause
-224 “Illegal Parameter” The <name> parameter was not correct.
-109 “Missing Parameter” The <name> parameter was omitted.