Metek EX1200A SERIES, User Manual

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VTI Instruments Corp.
70 EX1200A Series Basic Mainframe Operation
Device Reset Mode
Depressing the button for a longer time (greater than 1 s but less than or equal to 10 s) causes the
EX1200A to reset in the same manner as clicking the Reset button on the browser interface. All
switch modules, for instance, will move their switches to the predefined “reset” state. There is no
LED indication for this reset mode.
Device Reboot/LCI Reset Mode
To perform an LCI reset and an immediate reboot of the EX1200A, depress the reset button for
longer than 10 s, wait for the LAN LED to flash red, then release the button. This will return the
EX1200A to the power-on default state. The network configuration will be restored to factory
defaults in accordance with the LCI reset procedure described in the LXI Specification. The
EX1200A reverts to the default network configuration (DHCP and Auto IP enabled) instead of its
previous settings. VXI-11 Discovery (supported by the VISA IO-Libraries) can be used to
determine the IP address of the instrument.
DMM B
US
Some mainframes (EX1262A, EX1266A, and EX1268A configurations) provide a five-line bus
routed through the backplane to the onboard DMM. The lines are analogous to the five front panel
banana-jack connections on the DMM (see
Section 4 ). The bus is also accessible via the 9-pin rear
DMM BUS I/O connector which allows a signal to be routed to an external DMM or to extend the
bus to multiple mainframes.
Voltage and Resistance Measurements
CH1_COMH (Pin A15)
CH1_COML (Pin A14)
K76
CH2_COMH (Pin E17)
CH2_COML (Pin E16)
K77
D
M
M
B
u
s
BPL_HI
BPL_LO
4-Wire Resistance
K78
K79
D
M
M
B
u
s
BPL_SHI
BPL_SLO
CH1_COMH (Pin A15)
CH1_COML (Pin A14)
CH2_COMH (Pin E17)
CH2_COML (Pin E16)
Current Measurements (2 A Max)
K80
K81
D
M
M
B
u
s
BPL_DAMPS
BPL_LO
CH1_COMH (Pin A15)
CH1_COML (Pin A14)
CH2_COMH (Pin E17)
CH2_COML (Pin E16)
+HI, -LO Voltage and resistance measurements
+SHI, -SLO Sense lines for 4-wire resistance measurements (used with +HI and -LO)
+DAMPS Current measurement (used with -LO)
F
IGURE
3-2:T
YPICAL
DMM B
US
C
ONNECTIVITY
(EX1200-3072 S
HOWN
)
Figure 3-2 shows typical connections available through a switch module to the DMM bus on the
backplane. This direct backplane connection is not available on all cards (refer to the
EX1200A
Series Switch Card User’s Manual
for specific plug-in module capabilities). The DMM can be
configured to take readings through the front panel banana-jacks or the backplane bus
programmatically or through the SFP/browser interface of the DMM. Please see
Section 4 for
more information on taking measurements with the DMM.
Slots configured for a matrix bus are not tied to a DMM bus. To use the onboard DMM with a
matrix bus card, external wiring should be used to connect the desired front panel matrix output to
the DMM, either through the front panel banana-jack connectors or through the 9-pin DMM bus
I/O connector.