Keithley 263 User Manual

APPLICATIONS
1. Current Range Calibration (steps 6,7 and 8)--In these
1. Valhalla 2500 Current Source
steps precision resistors (Valhalla Model 2500 Current
2. ES1 1050 Decade Resistor
Source and ES1 Model SR-1050) and a DC calibrator
(Fluke Model 343A) are used to source current. Instead,
3. Keithley R-289-10G Resistors (2)
use the Model 263 to source 19mA, 190/rA, 1.9fiA and
4. Keithley R-289-100G Resistor
19~4 to the Model 619. To connect the output of the
5. Guildline 9520 Teraohmmeter
Model 263 to the input of the Model 619 use a triax
6. Guarded Test Fixture
cable.
2. 20ka Range (Ohms Reference) Calibration (step lO)-
This step uses the ES1 1010 Decade resistor to source
19kn to the Model 619. Instead, use the Model 263 to
source lOk0 to the Model 263.
3. 20GQ Range Calibration (steps 11 and 12)~These steps
use resistors that are installed in a shielded, guarded
fixture that must be built. The actual resistance of this
“ohms source” is then measured by a teraohmmeter
(Guildlme Model 9520). A much simpler alternative is
to use the Model 263 to source 1OGfl to the Model 619.
The Model 263 must be in the guarded configuration
and connected to the Model 619 through the Model 6191
Guarded Input Adapter (see Figure 5-8).
4. Range Verification-Use the Model 263 to verify the ac-
curacy of the current and resistance ranges (except 2TQ
range).
Using the Model 263 as described above eliminates the
need for the following equipment listed in Table 7-2 of the
calibration procedure.
5.4.3 Model 614 Electrometer Calibration
Referring the calibration procedure in the Model 614 In-
struction Manual, use the Model 263 as follows:
1. Volts Calibration (steps 6, 7 and 9)-Use the Model 263
as a voltage source in place of the Fluke 343A DC
Calibrator.
2. Current andResistance Calibration (steps 5, 6 and 7)-
These steps use precision resistors (ES1 DB-62) and a
DC voltage calibrator (Fluke 343A) to source current.
Instead, use the Model 263 to source 1.9OoOOnA to the
Model 614.
NOTE: The Model 263 can be used to verify the ac-
curacy of all ranges of the Model 614.
Using the Model 263 as described above eliminates the
need for the Fluke 343A DC Calibrator and the ES1 DB-62
Decade Resistor.
. - - - _ _ _ _ _ _
MODEL 263
MODEL 6191 ADAPTER
LO
BANANA CABLE
HI
IJ-
.._ -_
; OUTPUT
619 ELECTROMETER
Figure 5-6. Sourcing Guarded Ohms to Electrometer Using an Input Adapter
5-15

Keithley 263 Specifications

General

Brand	Keithley
Model	263
Category	Test Equipment
Language	English