Keithley 2002 User Manual

IEEE-488 Reference
3-69
PRINT #1, "output 16; :calc:data?" ' Query result of CALC1
PRINT #1, "enter 16" ' Get response message from 2002
:FRESh?
:CALCulate[1]:DATA:FRESh? Recalculate CALC 1
This query command is used to return a new (fresh) math result of CALC1. This command will
not request the same result twice. If a new reading is triggered, this command will wait until the
math result is available. When CALC1 is disabled, there is no difference between SENS:-
DATA:FRES? and CALC:DATA:FRES?.
PRINT #1, "output 16; :calc:data:fresh?" ' Query new result of CALC1
PRINT #1, "enter 16" ' Get response from 2002
:IMMediate
:CALCulate[1]:IMMediate Recalculate CALC 1
:IMMediate? Perform calculation and read result (equivalent to :CALCulate[1]:IMMediate;
DATA?)
When you change the math calculation, the next instrument reading reflects the new calculation
(assuming CALC 1 math is enabled). If the instrument is not in a continuous measurement mode
(i.e. waiting for a trigger), the displayed reading will not update to reflect the new calculation
until the next reading conversion occurs.
This action command allows you to reprocess the current input data to reflect a new calculation.
For example, assume the instrument is in a non-continuous measurement mode and requires a
manual trigger to cause the next reading conversion. Changing the calculation will not affect the
currently displayed reading. However, sending the :IMMediate command reprocesses that dis-
played reading to reflect the new calculation. Note that sending the :IMMediate command does
not initiate a reading conversion.
An alternate way to perform the calculation and read the result is by using the query form of the
command (:IMMediate?). When this command is sent, the calculation is performed and the
result is queried.
PRINT #1, "output 16; :syst:pres?" ' Select defaults
PRINT #1, "output 16; :trig:sour bus" ' Place 2002 in one-shot measure mode
SLEEP 3 ' Wait three seconds
PRINT #1, "output 16; :calc:form pol" ' Select polynomial math calculation
PRINT #1, "output 16; :calc:kmat:ma0f 50" ' Set "a0" to 50
PRINT #1, "output 16; :calc:stat on" ' Enable MATH calculation
SLEEP 3 ' Wait three seconds
PRINT #1, "output 16; :cal:imm" ' Perform calculation (adds 50 to
reading)
:CALCulate2
This Calculate subsystem is used to configure and control CALC 2 operations on readings
stored in the buffer.
Program fragment
Description
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Query
Description
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3.12.2

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