E-2 Example Programs Model 6485 Picoammeter Instruction Manual
Programming examples
This section contains example programs (pseudo-code) to achieve speed specifications
(for a specific example of a QuickBasic program using SRQ, see Figure G-2):
1000 readings/second into internal buffer
NOTE This program configures the Model 6485 to 0.01 PLC, digital filters off, front
panel off, auto-zero off, as well as takes and stores 2500 readings.
*RST ' Return 6485 to RST defaults.
TRIG:DEL 0 ' Set trigger delay to zero seconds
TRIG:COUNT 2500 ' Set trigger count to 2500
SENS:CURR:RANG:AUTO OFF ' Turn auto-range off
SENS:CURR:NPLC .01 ' Set integration rate to .01 PLC
SENS:CURR:RANG .002 ' Use 2mA range
SYST:ZCH OFF ' Turn zero check off
SYST:AZER:STAT OFF ' Turn auto-zero off
DISP:ENAB OFF ' Turn display off
*CLS ' Clear status model
TRAC:POIN 2500 ' Set buffer size to 2500
TRAC:CLE ' Clear buffer
TRAC:FEED:CONT NEXT ' Set storage control to start on next
' reading
STAT:MEAS:ENAB 512 ' Enable buffer full measurement event
*SRE 1 ' Enable SRQ on buffer full measurement
' event
*OPC? ' operation complete query
' (synchronize completion of commands)
read back result of *opc?
INIT ' start taking and storing readings
wait for GPIB SRQ line to go true
DISP:ENAB ON ' turn display back on
TRAC:DATA? ' Request data from buffer
read back result
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