User`s manual
98 Agilent E8462A Relay Multiplexer Command Reference
[ROUTe:]SCAN:MODE
[ROUTe:]SCAN:MODE <mode> Sets the multiplexer channels defined by the
[ROUTe:]SCAN <channel_list> command for none, volts, two-wire ohms, or
four-wire ohms measurements.
Parameters
Comments Order of Command Execution: The [ROUTe:]SCAN:MODE and
[ROUTe:]FUNCtion commands must be executed before the [ROUTe:]SCAN
<
channel_list> command.
RES Mode versus 4-wire: When [ROUTe:]FUNC is WIRE4, WIRE4X2 OR
WIRE4X4, RES Mode will operate the same as FRES.
NONE and VOLT Mode: When selected, channel_list is setup for volts
measurements.
VOLT mode is also used when making two-wire ohms measurements
using two-wire multimeters.
RES Mode in WIRE2: When selected, channel_list is setup for two-wire ohms
measurements. Control relays 9002 and 9009 are closed to connect Terminal 4
(Ter4) to Terminal 0 (Ter0) and Terminal 5 (Ter5) to Terminal 1 (Ter1). Ter4 and
Ter5 could be used to connect to the Ohmmeter’s current source. When
SCAN:PORT ABUS is selected, control relays 9203 and 9204 are also closed to
connect Analog H2 and Analog L2 which are the Analog Bus connections to the
Ohmmeter’s current source. When selected, the multimeter SENSE/SOURCE leads
are used to make the measurement. When using the HI/LO leads on a multimeter to
make the measurement, use the
VOLT mode.
FRES Mode: When selected, channel_list is setup for four-wire ohms
measurements. This mode is supported by the WIRE4, WIRE4X2 and WIRE4X4
FUNCtions. All channels of WIRE4 may be routed to the Analog Bus, but only the
lowest bank of WIRE4X2 and WIRE4X4 may be routed to the Analog Bus.
*RST Condition:
[ROUTe:]SCAN:MODE NONE
Example Selecting the Four-Wire Ohms Measurement
This example selects the four-wire ohms measurement mode (
FRES) on card #1 of
a single-module switchbox.
FUNC 1,WIRE4
Set mode to four-wire.
TRIG:SOUR EXT
Selects external trigger source.
SCAN:MODE FRES
Selects four-wire scan mode.
SCAN (@130:137)
Scan channels 30 to 37.
INIT
Starts scanning cycle.
Parameter
Name
Parameter
Type Range of Values
Default
Value
mode
discrete NONE|VOLT|RES|FRES NONE