Keithley 220 User Manual

8. Program the Output to the operate mode by pressing the
pressing the START/STOP
TWO SACK TO BACK LENER
DIODES. MOTOROLA ,hl,20ZS,a
Figure 2-3. Limiting inductive Reaction Voltage
2.4.2 Examples of Operation
The following examples depict several operating levels and
conditions.
2.4 OPERATION OF THE MODEL 220
The Model 220 has several diierent operating parameters.
These parameters (step, single continuous, source, V-limit,
dwell time etc) are to be programmed using the following
general procedure. Several examples of exact programming
are given after the following.
2.4.1 Model 220 General Operating Procedure
NOTE
Upon power up or upon actuation of the RESET
button the Model 220 is set to memory location 1.
1. Turn on the Model 220 and allow one hour for warm up for
rated accuracy operation.
2. Select memory location.
A. Press MEMORY.
B. Press the number(s) of the desired memory location (1 to
100).
C. Press ENTER.
3. Program the desired source.
A. Press SOURCE.
6. Press the numbarks) of the desired source current
(.0000-9mA to lOl.OOmAI. Note that upon power-up the
source is sat to .OOOO-9.
C. Press ENTER.
4. Program the appropriate V-limit.
A. Press V-limit.
B. Press the number(s) of the appropriate compliance
voltage limit (1 to 105V in one volt increments). Upon
power-up the V-limit is set to 1V.
C. Press ENTER.
5. Program the desired dwell time.
A. Press DWELL TIME.
B. Press the number(s) of the appropriate dwell time
13msec to 999.9sec in 1 msec increments.) Upon power-
up the dwell time of memory location 1 is set to 3.000-3
sec.
C. Press ENTER.
6. Select the desired program mode Istep, single or con-
tinuousl.
7. Connect appropriate load.
NOTE
The output load must be noninductive. A small
amount of inductance in the load can be tolerated
if the inductive reaction voltage L# is limited to
less than 105V. Refer to paragraph 2.3.5.
Example 1 Error Message-The Model 220 will display an
error message if it is programmed into a parameter value that is
outside of the range of the instrument. Table 2-2 lists the con-
ditions that cause an error message. For example program the
Model 220 for memon/ location 102.
1. Press MEMORY.
2. Press 1, 0, 2.
3. Press ENTER.
After the ENTER button is pressed, the Model 220 displays the
following for approximately one second. Then the Model 220
returns to the previous display of the memory location,
/I
Table 2-2. Erroi Message Conditions
Parameters Limits
Source
/ Greater than 101 .OOmA
i
-Limit
Greater than 105V or an entrY of 000.
Dwell time
Greater than 999.9sec. less than 3msec.
Memory Greater than 100 or an entry of 000.
Example 2-In this example the Model 220 will be programm-
ed to output a current of 1OmA with a 1OV compliance limit,
Required Outpur: 1OmA with 1OV compliance.
Use the following procedure to program the Model 220 to out-
put the preceding parameters.
1. Select a memory location, if memory location 1 is not
desired.
2. Press SOURCE, 1, 0, EXPONENT, 3. ENTER. (Programs a
source value of 10mA.J
3. Press V-LIMIT, 1, 0, ENTER. (Programs 1OV V-Limit.)
4. Connect load.
5. Press OPERATE.
NOTE
If the ENTER button is not pressed in the
sequence indicated, the display data will not be
programmed into the appropriate marnon/ loca-
tion
Upon the actuation of step 5 the Model 220 outputs 1OmA
with a 1OV compliance limit. Press the SOURCE button to
2-5

Keithley 220 Specifications

General

Brand	Keithley
Model	220
Category	Measuring Instruments
Language	English