Figure 18-4 Connections For Mainframe Resistance Accuracy Verification - Keithley 6430 Instruction Manual

Mainframe resistance measurement accuracy
Use the following steps to verify that Model 6430 resistance measurement accuracy is
within specified limits. This procedure involves applying accurate resistances from a resistance
calibrator and then verifying that Model 6430 resistance measurements are within required
limits.
NOTE
CAUTION
1.
Figure 18-4
Connections for
mainframe resistance
accuracy verification
Before making resistance measurements, put the Model 6430 in the AUTO SOURCE
mode (press CONFIG, then Ω , select SOURCE, select AUTO, then press ENTER).
Before testing the 20Ω and 200Ω ohms ranges, make sure your resistance
calibrator can safely handle the default test currents for those ranges
(100mA and 10mA for the 20Ω and 200Ω ranges respectively). If not, use
the Model 6430 MANUAL ohms mode, and set the test current to the max-
imum safe calibrator current. Note that Model 6430 measurement accu-
racy is reduced and reading limits should be recalculated using the
additional uncertainty when using MANUAL ohms. See the specifications
in Appendix A for details.
With the power off, connect the resistance calibrator to the Model 6430 INPUT/
OUTPUT and 4-WIRE SENSE jacks as shown in Figure 18-4. Be sure to use the 4-wire
connections as shown.
Model 6430
WARNING: WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY. NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
5V
HI
PK
MADE IN
V, Ω,
U.S.A.
GUARD
250V 250V 5V
5V
PEAK PEAK PEAK
PEAK
GUARD
SENSE
LO
4-WIRE INPUT/
42V
SENSE OUTPUT
PEAK
IEEE-488
(ENTER IEEE ADDRESS
WITH FRONT PANEL MENU) TRIGGER
LINK
RS232
CAUTION: CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
Resistance Calibrator
REMOTE !
PreAmp
LINE FUSE
SLOWBLOW
2.5A, 250V
LINE RATING
100-240VAC
50, 60, HZ
100VA MAX
INTERLOCK-
DIGITAL I/O
Output HI
Output LO
Performance Verification
Sense HI
Sense LO
18-15