3. Press VLIMIT,2,6,ENTER. (Programs a compliance
voltage of 26V.I
4. Connect load.
5. Press OPERATE.
Upon actuation of step 5 the Model 224 outputs 20nA with a
26V compliance limit. The end result of this example is the
same as the end result of Example 2. The only difference is
the method used to program the source value. Press the
SOURCE button to verify that 20nA was actually pro-
grammed into the Model 224. Once the SOURCE button has
been activated the source value is displayed on the front
panel. Press the V-LIMIT button to verify that a 26V com-
pliance limit was actually programmed into the Model 224.
Once the V-LIMIT button has been activated the V-limit is
displayed on the front panel.
Table 2-5. Front Panel Messages
’
Message
Description
T-TITJ
+H30fMd3 p
ower up display segment test.
m
HI limit of the l-limit.
p7c-j
LO limit of the l-limit.
b--
Example of the software revision level.
-7c-T-y
Factory set value of the IEEE-488 interface.
Err]
Error, one of the following conditions exists.
Selecting source value that is out of the range of the Model 224.
(Greater than 101 .OO-3A or less than -101 .OO-3A).
Selecting auto time of less than 50.00~3sec or greater than 999.9sec.
Selecting l-limit that is less than -101 .OO-3A or greater than 101 .OO-3A.
Selecting V-limit that is less than 1V or greater than 105V.
Selecting source value that is less than or greater than the programmed
limits. (Auto mode only)
Selected LO limit is higher than selected HI limit after auto is pressed.
When l-limit or full scale is reached in auto mode.
Example 4 Manual INCWDECR Operation: The value of
current can be modified either manually or automatically.
This example shows how to modify the current value manual-
IY.
Manual INCR/DECR Notes:
1. The DIGIT button must be pressed the desired number of
times to select the digit that is to be modified.
2. The term increment means that the increasing direction is
toward the positive current limit. The term decrement
‘means that the decreasing direction is toward the negative
current limit.
3. The displayed value is also the output value.
4. In this mode, the AUTO, INCR and DECR LED’s are
turned off.
5. The INCR function has the mathematical carry capability.
6. The DECR function has the mathematical borrow capabil-
ity.
7. The least significant digit does not increment or decre-
ment.
8. The exponent digit does not increment or decrement.
9. Only the source can be modified by INCR or DECR.
2-8
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