Agilent Technologies E1476A User Manual page 85

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84 Switchbox Command Reference
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Special Case of Using Upper Range 99 in the Channel List:
as 99 (such as @100:199) automatically scans all channels on the card number
specified by cc, but does not close tree relays 90 through 94.
When ROUTe:SCAN is executed, the channel list is checked for
Defining Scan List:
valid card and channel numbers. An error is generated for an invalid channel list.
When a valid <channel_list> is defined, INITiate[:IMMediate]
Scanning Operation:
begins the scan and closes the first channel in the <channel_list>. Successive
triggers from the source specified by TRIGger:SOURce advance the scan through
the <channel_list>.
Four-Wire Resistance Scanning:
<channel_list> (see [ROUTe:]SCAN:MODE command).
See the ABORt command.
Stopping Scan:
Closing the VSA, VSB, CS, RTA and RTB Tree Relays:
through 94 is automatically controlled by the firmware during a scan and is based on
the settings of ROUTe:SCAN:PORT and ROUTe:SCAN:MODE. These are invalid
channels to explicitly place in a ROUTe:SCAN <channel_list>.
[ROUTe:]CLOSe, [ROUTe:]OPEN, [ROUTe:]SCAN:MODE,
Related Commands:
[ROUTe:]SCAN:PORT, TRIGger, TRIGger:SOURce
All channels open.
*RST Condition:
Scanning Using External Devices
This BASIC language example shows how to scan channels using the E1406
Command Module and an E3457A Digital Multimeter via GPIB. This example uses
the E1406 Command Module "Trig Out" port to synchronize the E1476A Multiplexer
module (in a switchbox configuration) to the 3457A multimeter.
The trigger pulse from the "Trig Out" port triggers the 3457A multimeter for a
measurement. See Chapter 2 for typical user connections to the multiplexer. The
addresses used are 70900 for the E1406 Command Module, 722 for the 3457A
Multimeter, and 70914 for the E1476A Multiplexer.
Specifying the last channel
ROUTe:SCAN:MODE FRES restricts the valid
The proper state of channels 90
Multimeter to ext trig and measure dc volts
Enable "Trig Out" port on cmd module
Set switchbox to receive Bus triggers
Set switchbox to measure voltage
during scanning
Set switchbox to close the appropriate tree
relays during scanning
Select the channel list
Start scanning cycle
Start count loop
Enter multimeter reading into A
Print reading in A
Trigger the switchbox to advance the
channel list
Increment count
Chapter 4