Keithley 2002 User Manual

IEEE-488 Reference
3-149
:FEED? Query buffer feed
This command is used to select the source of readings to be placed in the buffer. With SENSe[1]
selected, raw readings are placed in the buffer when storage is performed. With CALCulate[1]
selected, calculated math readings (POLYnomial or PERCent or NONE) are placed in the
buffer.
With NONE selected, no readings are placed in the buffer when storage is performed over the
bus.
PRINT #1, "output 16; :trac:feed calc; feed?" ' CALC1 buffer readings
PRINT #1, "enter 16" ' Get response from 2002
:[PERCent] <n>
:TRACe:FEED:PRETrigger:AMOunt:[PERCent] <n> Specify percentof pre-trigger readings
<n> = 0 to 100 % of buffer for pre-trigger readings
DEFault 50% of buffer for pre-trigger readings
MINimum 0% of buffer for pre-trigger readings
MAXimum 100% of buffer for pre-trigger readings
:[PERCent]?
This command is used to specify how much of the defined buffer (:POINts) will be used to store
pre-triggered readings. When a pre-trigger store is started (see :FEED:CONTrol), readings are
continuously stored in the buffer. When the pre-trigger event occurs (see :PRETrig-
ger:SOURce), post-trigger readings will then fill the part of the buffer that is not reserved for
pre-trigger readings.
For example, assume 25% of a 100 point buffer is reserved for pre-trigger readings. When the
pre-trigger store is started, readings continuously fill the buffer. When the pre-trigger event
occurs, subsequent readings will then be stored starting at buffer location 26 and continue until
buffer location 100 is filled. Storage stops after buffer location 100 is filled. The result is 25 pre-
trigger readings and 75 post-trigger readings. See paragraph 2.8.2 for more information about
pre-trigger.
PRINT #1, "output 16; :trac:feed:pret:amo 25; amo?" ' 25% for pre-trigger
rdgs
PRINT #1, "enter 16" ' Get response from 2002
:READings <n>
:TRACe:FEED:PRETrigger:AMOunt:READings <n> Specify number of pre-trigger readings
No memory
option MEM 1 MEM 2
<n> = 0 to 404 0 to 1381 0 to 5980 (Full)
0 to 2027 0 to 6909 0 to 29908 (Compact)
MAXimum Present buffer size (which is set by TRACe:POINts)
DEFault Half present buffer size (which is set by TRACe:POINts)
MINimum 0 (all cases)
Query
Description
Program fragment
Parameters
Query
Description
Program fragment
Parameters

Keithley 2002 Specifications

General

Resolution	8.5 digits
DC Voltage Accuracy	±0.0006%
Maximum DC Voltage	1000 V
Maximum AC Voltage	750 V
Maximum DC Current	3 A
Maximum AC Current	3 A
Connectivity	GPIB, RS-232
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
Resistance Range	10 Ω to 1 GΩ
Model	2002
Category	Multimeter
Interface	GPIB, RS-232
AC Current Accuracy	±0.1%
Frequency Range	0.1Hz to 300kHz
Display	VFD
Type	Digital
Power Supply	100-240V AC, 50/60Hz
Current Range (DC)	100 μA to 3 A
Current Accuracy (DC)	±0.01%
Current Range (AC)	100 μA to 3 A
Current Accuracy (AC)	±0.1%
DC Current Range	100 μA to 3 A
AC Current Range	100 μA to 3 A