Section 2 - Operation; Introduction; Preparation For Use; Correct Line Voltage - Keithley 224 Instruction Manual

SECTION 2
OPERATION
2.1 INTRODUCTION
This section contains operating instructions for the Model
224 Programmable Current Source. The operating instruc-
tions are divided into several categories including: prepara-
tion for use, operation, applications and detailed front and
rear panel descriptions.
For simple "getting started" information refer to paragraph
2.3.7 General Operating Procedure.
For front and rear panel illustrations of the Model 224 refer to
Figure 2-1.
2.2 PREPARATION FOR USE
2.2.1 Correct Line Voltage
Connect the Model 224 to a properly grounded power recep-
tacle. Refer to Table 2-l for the range of line voltage that the
Model 224 can operate on. For fuse replacement or line
voltage selection refer to Section 5 Maintenance.
WARNING
Ground the instrument through a properly earth
grounded receptacle before operation. Failure to
ground the instrument can result in severe per-
sonal injury or death in the event of a short cir-
cuit or malfunction.
Table 2-l. Line Voltage Setting
For instruments equipped with low voltage
transformer TR-187.
2.2.2 Power Up
After the Model 224 is connected to a properly grounded
power source it can be powered up. When the instrument is
turned on it goes through a power up sequence that is out-
lined as follows:
1. Immediately after turning on the Model 224 via the power
switch, the display will indicate the following for several
seconds.
A. This is a display test. The operator can note inoperative
display segments by comparing the Model 224's display
with the above figure.
B. In addition, the pushbutton and the TALK, LISTEN and
REMOTE indicators will light. All indicators will light
simultaneously if operating correctly.
2. After the display test is complete the Model 224 displays
the software revision level for approximately one second.
The following is an example of software revision level B
2.2.
Example:
/---KF-j
3. If the Model 2243 IEEE interface is installed, the Model 224
displays the primary address for approximately one sec-
cond. The primary address of the Model 2243 is factory
set at 19. If the Model 2243 is not installed in the Model
224, the power up sequence skips this step and goes on to
step 4.
4. At this point the Model 224 reverts to the default condi-
tions listed in Table 2-2.
2.2.3 Warm Up
To achieve rated accuracy the Model 224 requires one hour
for warm up.
2.3 OPERATING INSTRUCTIONS
2.3.1 Environmental Conditions
Operation of the Model 224 should be at an ambient
temperature within the range of O°C to 50°C, up to 35OC at
70% noncondensing relative humidity. Environmental condi-
tions for storage are from -25OC to 7OOC.
2.3.2 Front Panel Controls
Model 224 front panel controls are listed in Table 2-3. Their
operation and function are briefly described in the table. For
detailed information concerning the Model 224 front panel
refer to paragraph 2.5 and Figure 2-1.
2.3.3 Rear Panel Description
The rear panel of the Model 224 has several terminals and
connectors. These are listed and described in Table 2-4. For
detailed information concerning the rear panel refer to
paragraph 2.6 and Figure 2-1.
2-1