EXPONENT-The EXPONENT button allows entry of expo-
nent data onto the display.
DATA-The DATA group of buttons allow the entry of
numerical data on the display.
AUTO-When activated (LED on), the auto button selects
the auto function for incr/decr of the source data. Refer to
Example 5 for auto mode notes.
TRIG-The TRIG button selects the trigger function for ex-
ternal trigger input via the rear panel connector. When ac-
tivated (LED on), an external trigger input pulse of the
specifications shown in Figure 2-5, triggers the Model 224 to
increment or decrement the displayed source value. When
deactivated, (LED off), the trigger function is disabled.
2.6 DETAILED REAR PANEL DESCRIPTION
OUTPUT-The OUTPUT connector is a Teflon @ insulated
female triax connector.
GUARD-The GUARD terminal provides a low impedance
voltage source that is equal to the output compliance voltage.
The GUARD terminal is useful in reducing leakage currents
for critical applications. Refer to Example 7.
OUTPUT COMMON-The OUTPUT COMMON terminal
provides easy access to the inner shield of the output connec-
tor. The inner shield of the output connector is output LO.
CHASSIS GROUND-The CHASSIS GROUND terminal
provides easy access to chassis ground (earth ground).
CAUTION
Do not float the instrument above 250Vrms.
Instrument damage may occur. Refer to the
specifications preceding Section 1.
EXTERNAL TRIGGER INPUT-The EXTERNAL TRIGGER
INPUT connector accepts an input trigger pulse that has the
specifications shown in Figure 2-5. Depending on the mode
(auto/manual) the pulse triggers the instrument to incre-
ment/decrement the selected digit (source value) upon
receiving the pulse. This is a female BNC connector. This
connector is active only when the front panel TRIG button is
activated (LED on).
EXTERNAL TRIGGER OUTPUT-The EXTERNAL TRIG-
GER OUTPUT connector provides an output pulse with the
specifications shown in Figure 2-5. This pulse is present only
when the selected digit (source value) has completed the in-
crement or decrement action. Trigger output is independent
of front panel trigger mode.
FUSE-This is the line power fuse and it is rated as listed in
Table 5-1.
CAUTION
Do not install a fuse with a higher rating
than specified in Table 5-l. Instrument
damage may result.
LINE RECEPTACLE-The line power receptacle mates with
a three wire line cord. Refer to Table 2-l for line power re-
quirements.
*IEEE-488 INTERFACE-This connector provides IEEE-488
bus connection to the Model 2243. The connector mates
with the Model 7008-3 and 7008-6 IEEE cables.
*ADDRESS-The address switches are used to set the
primary address of the Model 2243 IEEE-488 interface. The
factory set value is 19(1001 I). The primary address is undated
only upon power up.
*DIGITAL l/O-The digital I/O port consists of four input
and four output lines as well as IEEE common and + 5VDC.
The output will drive one TTL load. The instrument can be
programmed to generate an SRQ upon any change in the
four bit input data.
*These connectors are present only when the Model 2243
IEEE-488 option is installed in the Model 224. For more in-
formation concerning these connectors refer to the Model
2243 Instruction Manual.
2-15/2-16
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