Keithley 224

3-2
3.5.2 100µA and 10µA Range Verification
1. Replace the 100 Ω resistor in Figure 3-1 with the 100k Ω
resistor specified in Table 3-1.
2. Select the 20VDC range on the Model 192.
A. Program the Model 224 to output +00.00-6A. Verify
that the reading on the Model 192 does not exceed
+10mV.
B. Program the Model 224 to output +0.000-6A. Verify
that the reading on the Model 192 does not exceed
+1mV.
3. Program the Model 224 to output +100.00-6A with a 20V
compliance limit.
4. Verify the reading on the Model 192 to be between 10.016
and 9.984V.
5. Program the Model 224 to standby (press OPERATE).
6. Select the 2VDC range on the Model 192.
7. Program the Model 224 to output +10.00-6A with a 20V
compliance limit.
8. Verify the reading on the Model 192 to be between
+1.0016 to 0.9984V.
9. Repeat steps 2 through 8 with negative output current.
The verification of the Model 224’s accuracy is now complete.
HI
LO
100Ω
DCV ACV
PMT
TO
HI
HI
LO
LO
Ω SENSE
RECALL
TE
MODEL 192
FRONT PANEL
Ω
1.4kV MAX
MODEL 220
REAR PANEL
!
Figure 3-1. 100mA to 1mA Range Verification