SECTION 2
Getting Started
2.3.1
Current Measurements
The steps below outline the basic procedure for using the
Mode1486/487 to make current measurements from the
front panel:
1.
2.
3.
4.
5.
6.
7.
8.
Perform factory initialization as follows to return the
instnunent to factory default conditions:
A.
B.
C.
Press and rele&e MFNIJ until the following
message is displayed:
DEFAULTS
OK
Use the rotary knob, or the4 and b keys to dis-
play the following message:
DEFAULTS FACTORY
Press MENU. The instrument will return to the
normal IneasuTement display state.
Note: Performing factory initialization is a con-
venient method to return the instrument to typi-
cally used operating states. Using factoiy de-
faults, zero check is enabled, autorange is en-
abled, and filter (digital + analog) is enabled.
Connect the rear panel triax INPUT connector to the
current source. For example, Figure 2-5 shows a
Keithley Model 263 source connected to the Model
486/4si
On the Model 486/487, press SHIFT and then COR-
RECT to perform zero cormztion. This will cancel
ally inted offsets.
On the Model 486/487, disable zero check by press-
ingZEROCHECK.The~OCHECKindicatorwill
turn off.
If you intend to suppress an offset current from the
external current source, perform the following steps:
A. Apply the current to be suppressed to the input.
That current will be measured and displayed on
the Model 4861487.
B. On the Model 486/487, press REL. The current
will be suppressed as indicated by the zeroed
display.
Apply the signal current to be measured to the input
of the Model 486/487.
Read the current measurement on the display of the
Model 486/487.
When the measurement is complete, enable zero
check to avoid accidental overloads to the instru-
ment. In general, zero check should be left enabled
while the instrument is tuned on but not in use.
2.3.2 V/I Ohms Measurements
(Model 487)
NOTE
The following procedure demonstrates how
to properly use the V-Source of the Model 487.
Keep in mind that the V-Source can be used as
an &dependent source for any appropriate
application.
For V/I Ohms resistance measurements, the Model 487
sources a voltage to a device under test (DUT) and meas-
ures the subsequent current. The resistance value of the
DLIT is automatically calculated (R = V/I) and displayed
in ohms.
The steps below outline the basic procedure for using the
Model 487 to make V/I Ohms measurements from the
front panel:
1. Performfactory initializationasfollows toretumthe
instroment to factors default conditions:
A.
B.
C.
Press and relea;e MENU until the following
message is displayed:
DEFAULTS OK
Use the rotary knob, or the 4 and b keys to dis-
play the following message:
DEFAULTS
FACTORY
Press MENU. The instrument WiII return to the
normal measurement display state.
Note: Performing factory initition is a con-
venient method to return the instrument to typi-
cally used operathg states. Using factory de-
faults, zero check is enabled, autorange is en-
abled, filter (digital + anslog) is enabled, I-limit is
set to 2.5mA.
2. SelecttheV/IOhmsfunctionbypressingSHIFTand
then OHMS (v/I).
3. With the DUT installed in an appropriate test fixture,
connect it to the V-Source and picosmmeter of the
Model 487. Figure 2-6 shows how to connect a DUT
that is installed in the Keithley Model 8002A t&t fix-
ture to the Model 487.
WARNING
To prevent contact with possible hazardous
voltages, make sure the Model 487 interlock
2-6
To Next Page
Loading...
Need help?
General
