Long Integration Readings; Pulse Current Readings; Mav (Message Available Bit) - Keithley 2302 Instruction Manual

Long integration readings

When taking long integration readings, make sure to set the timeout value longer than the
integration time. For example, if the integration period is 15 seconds, set the "GPIB timeout for
>
responses" 15000. Setting the "GPIB timeout for responses" greater than the integration time
ensures that a GPIB timeout does not occur while the Model 2306 is integrating the reading. The
GPIB timeout may need to be set to a value greater than twice the long integration time for cases
where the triggered edge was just missed (refer to Figure 4-2).

Pulse current readings

When taking a pulse current low readings with a low time of 500ms and a pulse average of
50, the integration will take 25 seconds. Since the integration period is 25 seconds, set the "GPIB
timeout for responses"
current average readings is similar.

MAV (Message Available Bit)

The MAV is an alternative to setting the GPIB timeout for responses. The MAV is the
message available bit of the status register. Enabling the MAV bit causes an SRQ to occur when
the instrument has a message to send to the computer.
When using the MAV, two additional commands are required *SRE 16 and the command that
waits for SRQ (specific to programming language).
Example
Command
*SRE 16
READ?
Programming language specific
Programming language specific
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
>
25000. Setting timeout when taking pulse current high and pulse
GPIB Operation
Description
Sets the MAV bit to enable. This
command is required before the send-
ing READ? command.
Requests power supply to trigger a
reading for the selected function on
the battery channel (channel 1).
Wait for SRQ.
Request power supply to talk.
7-5