VTI Instruments Corp.
24
EX2500A Module Description
User Configurable Switches
•
CLK10 IN 50 OHM TERMINATION IN/OUT
: when “IN” is selected, a 50
Ω impedance
to ground is presented to the incoming waveform. This is useful when connecting these ports
to 50
Ω BNC
-to-SMB cables. When “OUT” is selected, the 50
Ω termination is removed.
The default for this switch is “OUT” (switch in the up position).
•
CLK10 OUT TURNED ON/OFF
: when “ON” is selected, a 10 MHz clock signal is
available at EXT CLK OUT. When “OFF” is selected, the 10 MHz clock signal is not routed
to the SMB connector.
The default for this switch is “OFF” (switch in the up position).
•
CLK10 OUT (NOT) INTERTED
: when “NOT INVERTED” is selected, the 10 MHz clock
signal on the CLK OUT port is in phase with the on-board oscillator. When “inverted”, the
10 MHz clock signal is 180° out-of-phase with the oscillator.
The default for this switch is “NOT INVERTED” (switch in the down position).
•
TRIG IN 50 OHM TERMINATION IN/OUT
: when “IN” is selected, a 50
Ω termination is
presented to the incoming trigger signal. This is useful when connecting these ports to 50
Ω
BNC-to-SMB cables. When “OUT” is selected, the 50
Ω termination is removed.
The default for this switch is “OUT” (switch in the up position).
•
ON-BOARD OSCILLATOR TRIM DIS-CONNECTED/CONNECTED
: when the
EX2500A is loaded with the TCXO or OCXO option, this switch enables the 10 MHz output
to be trimmed. When “connected” is selected, the clock trim is enabled for the TCXO/OCXO
options. The position of this switch is irrelevant with the standard oscillator option. When
“DIS-CONNECTED”, or in the up position, the TCXO/OCXO clock trim is disabled.
The default for this switch is “CONNECTED” (switch in the down position).
•
ON-BOARD OSCIALLATOR POWER ON/OFF
: when “ON” is selected, the VXIbus
backplane CLK10 + and CLK10 – signals are enabled. This switch should be in the down
default position in most applications.
The default for this switch is “ON” (switch in the down position).
•
EXTERNAL/ON-BOARD OSCIALLATOR SELECTED
: when “ON-BOARD” is
selected, the EX2500A’s on-board oscillator (CLK10, TCXO, or OCXO) is selected. When
“EXTERNAL” is selected, the front panel SMB CLK10 input signal is used for the VXIbus
backplane CLK10 + and CLK10 – signals.
The default for this switch is “IN” (switch in the down position).
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