Keithley 6512, Instruction Manual

Page: 93 / 156

Performance Verification
5-3
1. Using the COUL (active) charge source of the Model
263, select the 2nC range.
2. Place the Model 263 in the coulombs function, and per-
form zero correction by enabling zero check and zero
correct in that order.
3. Disable zero check on the Model 6512.
Table 5-1
Limits for amps verification
6512
range 263
function 263
output Allowable reading
(1 Year, 18°C-28°C)
20mA
2mA
200µA
20µA
2µA
200nA
20nA
2nA
200pA
20pA
2pA AMPS
AMPS
AMPS
AMPS
AMPS
AMPS
AMPS
AMPS
AMPS V/R
AMPS V/R
AMPS V/R 19.000mA
1.90000mA
190.000µA
19.0000µA
1.90000µA
190.000nA
19.0000nA
1.90000nA
190.000pA
19.0000pA
1.90000pA 18.978 - 19.022mA
1.8973 - 1.9027mA
189.76 - 190.24µA
18.976 - 19.024µA
1.8973 - 1.9027µA
189.59 - 190.41nA
18.965 - 19.035nA
1.8962 - 1.9038nA
187.45 - 192.55pA
18.770 - 19.230pA
1.8811 - 1.9189pA
Figure 5-1
Connections for amps and coulombs verification
OUTPUT
2-SL
TRIAX C
MODEL 263
4. Program the Model 263 to output 1.90000nC, and press
OPERATE to source charge to the Model 6512.
5. Verify that the Model 6512 reading is between 1.8943
and 1.9057nC.
5.5.4 Volts verification
NOTE
Current and charge verification must be
performed before volts verification.
Connect the Model 6512 and 190V calibration source to the
Model 263, as shown in Figure 5-2, and perform volts verifi-
cation as follows:
1. On the Model 6512, enable zero check, and select the
200mV range.
2. Check to see that the display reads 000.00 ±1 count. If
not, enable zero correct.
3. Program the Model 263 to output 190.000mV.
4. Disable zero check, and verify that the reading on the
Model 6512 is within the limits listed in Table 5-2.
5. Using Table 5-2 as a guide, repeat steps 1 through 4 for
the 2V and 20V ranges.
6. Set the Model 6512 to the 200V range.
7. Set the external calibration source to output 190.000V to
the Model 263.
8. Source 190.000V to the Model 6512 by pressing SHIFT
VOLTS on the Model 263.
9. Verify that the reading on the Model 6512 is within the
limits listed in the table.
* Reading limits shown include Model 6512 and Model 263 accuracy specifications.
5.5.3 Coulombs verification
Connect the Model 6512 to the Model 263 as shown in Figure 5-1, and perform coulombs verification as follows: