B. Press the numbers that correspond to the desired
V-limit (Default is 3V.I
C. Press ENTER.
4. Select the desired source value. (Default is O.OOO-6A.)
There are two ways to select the source value: auto and
manual.
Manual Selection:
A. Press SOURCE.
B. Press the numbers (DATA keys) that correspond to the
desired source value. The source value ranges are from
-101 .OO-3A to O.OOO-6A to + 101.003A.
C. Press ENTER.
Auto Selection:
A. Press TIME. (Selects the output range mode. Default is
5Omsec. 1
B. Press the numbers that correspond to the desired in-
crement/decrement rate. The rate ranges from
50.00~3sec to 999.9sec.
C. Press ENTER.
D. Press SOURCE.
E. Press DIGIT the desired amount of times to select the
digit that is to be modified. The DIGIT button reverts
the modify digit to the most significant digit if the DIGIT
button is pressed when the cursor is presently on the
digit just before the least significant digit. The least
significant digit does not increment or decrement.
F. Press AUTO.
G. Press the INCR button to increment the displayed
value. Press DECR button to decrement the displayed
value.
NOTE
The INCR function has the mathematical carry
capability. The DECR function has the
mathematical borrow capability. The least
significant digit and the exponent digit do not in-
crement or decrement. Use manual selection to
modify these digits.
H. Press AUTO to stop the display at the desired value.
5. Connect the appropriate load.
6. Press OPERATE to output the displayed value. The output
is programmed to O.OOO-6A when not in the operate mode
and the display remains the same.
NOTE
The output load must be noninductive. A small
amount of inductance in the load can be
tolerated if the inductive reaction voltage
(L $ 1 is limited to less than 105V. Refer to
paragraph 2.3.5.
2.3.8 Front Panel Messages
The Model 224 has several front panel messages. These
messages appear throughout the operation of the Model 224
and are listed in Table 2-5.
2.3.9 Examples of Operation
The following examples present several operating methods
and variations.
Example 1 Output 10mA: In this example the Model 224
will be programmed to output a source value of 10mA with a
compliance voltage of IOV.
Required Output: 10mA with 1OV compliance.
Use the following procedure to program the Model 224 to
output the preceding parameters.
1. Turn on the Model 224. Allow one hour for warm up.
2. Press SOURCE,l,O,EXPONENT,3,ENTER. (Programs a
source value of lOmA.
3. Press V-LIMIT,l,O,ENTER. (Programs V-LIMIT of 1OV).
4. Connect load.
5. Press OPERATE.
If the ENTER button is not pressed in the sequence indicated
the operation will not take place as intended. Upon the actua-
tion of step 5 the Model 224 outputs 1OmA with a 1OV com-
pliance limit. Press the SOURCE button to verify that the
1OmA was actually programmed into the Model 224. Press
the V-LIMIT button to verify that the 1OV limit was actually
programmed into the Model 224.
Example 2 Output POnA: In this example the Model 224 will
be programmed to output a source value of 20nA with a
compliance of 26V.
Required Output: 20nA with a 26V compliance limit.
Use the following procedure to program the Model 224 to
output the preceding parameters.
1. Turn on the Model 224 and allow one hour for warm up.
2. Press SOURCE,2,0,EXPONENT,S,ENTER. (Programs a
source value of 20nA.I
3. Press WLIMIT,2,6,ENTER. (Programs a 26V compliance
limit.)
4. Connect load.
5. Press OPERATE.
Example 3 Output 20nA: In this example the Model 224 will
be programmed to output a source value of 20nA with a
compliance voltage of 26V. This example is the same as Ex-
ample 2 except for the method used to program the source
value.
Required Output: 20nA with a 26V compliance limit.
Use the following procedure to program the Model 224 to
output the preceding parameters.
1. Turn on the Model 224 and allow one hour for warm up.
2. Press SOURCE,O,.,0,2,EXPONENT,G,ENTER. (Programs
a source value of 20nA.I
2-7
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