
2-4 Using the Calibrator
UM4.6:CS6003 Original — December 1991
The operator station case on the calibrator front panel will not hold DIN
standard operator or display stations. The calibrator can, however, be
ordered with a DIN standard operator station case. The DIN standard
case is separate from the calibrator and sits on small rubber feet. A DIN
standard operator or display station mounts in the DIN standard case
and the appropriate cable connects the case to the card being
calibrated.
2.2.2.7 Breakout Terminals
The breakout terminals provide connections between the card being
tested and external devices. Each breakout terminal is a combination
binding post and standard banana jack. The numbered breakout
terminals provide access to the input and output channels of the
multiplexer I/O cards. The VO terminals provide connections to voltage
output cards. The CO1 and CO2 terminals provide connections to the
channels of current output cards. The MVI terminals allow the input of an
external voltage source. On the VO, MVI, CO1 and CO2 breakout
terminals, the black terminals indicate the grounded side of the pairs of
terminals. The +24V and +5V terminals provide external access to
internal calibrator supply voltages at a maximum of 0.1 amp for reference
and logic levels. The breakout terminals labeled 250 ohm LOAD are the
ends of a 250 ohm (
±
0.1 percent) resistor. Current outputs can be
connected across the resistor so that they can be measured by a
voltmeter.
2.2.2.8 Internal/External Switch
The switch labeled INT/EXT allows an external voltage source, input
through the calibrator +MVI and –MVI breakout terminals, to replace the
calibrator internal 5 volt reference. This is not required for any of the
present calibration or test procedures and the switch should be in the
INT position at all times.
2.2.2.9 Service Transfer Test Switch
The SVCE XFER TEST switch is used only during the functional test of a
service transfer unit. At all other times the SVCE XFER TEST switch
should be in the CONT OUT position.
2.2.2.10 Channel Select Switch
The CHANNEL SELECT switch determines which channel of the card
being calibrated, is being viewed by the calibrator. The channel selected
is displayed by a seven-segment LED.
2.2.2.11 Numerical Display
The calibrator numerical display consists of four, seven-segment LEDs. It
is used to display the results of several different tests. It also displays the
card identity codes of the multiplexer cards.
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