HP E8402A, User And Service Manual, Page: 84 / 249

86 Programming the Enhanced Monitor Chapter 3
HISTory:VOLTage[:HISTogram]?
<
supply
>[,MIN|MAX]
HISTory:VOLTage[:HISTogram]? <supply> returns the voltage histogram data held
for the <supply>. Ten values are returned for the amount of time the <supply>’s
voltage spent in ten different current ranges. Those voltage ranges can be queried
with the MIN and MAX optional parameter. The units of the time values returned
are HOURs by default, but can be changed with the
HISTory:UNIT[:TIME] command.
The units returned with the MIN or MAX parameters are millivolts.
Parameters
Returned Data
Comments
•
HIST: VOLTage? P5 returns 10 time values, units set/queried by H IST:UNIT .
•
HIST: VOLTage? P5,MAX
returns 10 voltages (in millivolts) representing the
maximums for each voltage range for the 5 volt supply.
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
A *RST has no effect on the HISTory subsystem.
Related
Commands
HISTory:VOLTage:MAXimum?, HISTory:VOLTage:CMINimum?,
HISTory:VOLTage:MINimum?, HISTory:RESet:VOLTage,
HISTory:UNITs[:TIME]
Name Type Range Default Description
< supply> enum. P5, P12, N12, P24,
N24, N5PT2, N2,
P5STby none Selects the power supply whose
voltage histogram is desired.
optional
parameter enum. MIN, MAX none Returns the maximums or
minimums volts (in millivolts).
Type Range Default Description
<range1> int32 0-2147483647 none lowest voltage range.
<range2> int32 0-2147483647 none second voltage range.
<range3> int32 0-2147483647 none third voltage range.
<range4> int32 0-2147483647 none fourth voltage range.
<range5> int32 0-2147483647 none fifth voltage range.
<range6> int32 0-2147483647 none sixth voltage range.
<range7> int32 0-2147483647 none seventh voltage range.
<range8> int32 0-2147483647 none eighth voltage range.
<range9> int32 0-2147483647 none ninth voltage range.
<range10> int32 0-2147483647 none highest voltage range.
Number Message Probable Cause
-224 “Illegal Parameter” The <supply> or optional parameter not correct.
-109 “Missing Parameter” The <supply> parameter was omitted.
-311 “Memory error” the historical data’s memory is not available.