Keithley 224 User Manual

Table 2-3. Front Panel Controls
Control
POWER ON/OFF
OPERATE
SOURCE
V-LIMIT
I-LIMIT
TIME
DIGIT
INCR
DECR
CANCEL
ENTER
EXPONENT
DATA
AUTO
TRIG
Description
Turns the instrument on or off.
When activated (LED on), the Model 224 outputs the displayed value of current.
When deactivated (LED off), the Model 224 is set to standby (O.OOO-6A is present
at the output).
When activated (LED on), the source data function is selected and displayed.
When deactivated (LED off), the source data is not displayed.
When activated (LED on), the voltage compliance is displayed. When deactivated
(LED off), the voltage compliance is not displayed.
I-LIMIT button selects the window of output current limit. Default value is
+ .OOOO-OA. When activated (LED on), the current (I) limit is displayed. The HI limit
is displayed first. When the l-limit button is pressed a second time the LO limit is
displayed. When deactivated (LED off), the l-limit is not displayed. This function
is used only in the auto mode.
When activated (LED on), the time function for the auto INCRIDECR is
displayed for inspection or modification.
Pressing the DIGIT button selects a display digit (c segment is flashing) for
alteration. Pressing the button while in the digit function selects the next digit
on the right for alteration. The DIGIT button wraps the modify digit around to the
most significant digit on the display if the DIGIT button is pressed when the cur-
sor is on the next to least significant digit.
In the manual mode, each time the button is pressed the selected digit is in-
cremented by one count. In the auto mode, the selected digit is incremented and
therefore, the source value, automatically at the programmed time rate, When the
programmed HI limit is reached the error message is displayed and the display re-
mains at the HI limit. This function has the mathematical capability of carry. The
least significant digit does not increment.
In the manual mode, each time the button is pressed the selected digit is
decremented by one count. In the auto mode, the selected digit is decremented
and therefore the source value, automatically at the programmed time rate. When
the programmed Ld limit is reached the error message is displayed and the display
remains at the LO limit. This function has the mathematical capability.
of borrow. The least significant digit does not decrement.
When activated, the CANCEL button momentarily blanks the display and ter-
minates the data modifying operation.
The ENTER button loads the displayed data into the Model 224.
The EXPONENT allows entry of exponent data onto the display.
The data group of buttons allows the entry of numerical data onto the display.
When activated (LED on), the AUTO button selects the auto function for
INCR/DECR of the source data.
When activated (LED on), an external trigger pulse via the rear panel triggers
the instrument to increment or decrement the display digit. When deactivated
(LED off), the trigger function is disabled.
2-3

Keithley 224 Specifications

General

Brand	Keithley
Model	224
Category	Power Supply
Language	English