Maintenance
7-5
Proceed as follows:
1. Connect the Model 263 Calibrator/Source to the Model
6512, as shown in Figure 7-3.
2. Place the Model 6512 in the amps function, and select
the 200pA range.
3. On the Model 6512, enable zero check and zero correct
in that order.
4. Program the Model 263 to output 00.000pA, and release
zero check on the Model 6512.
5. After allowing the reading to settle for a few seconds,
press SUPPRESS to zero the display of the Model 6512.
6. Program the Model 263 to output 190.000pA.
7. Adjust the display of the Model 6512 to read 190.00pA
using the Model 6512 ADJUST buttons.
8. Program the Model 263 to output 00.000pA by pressing
ZERO on the Model 263.
9. On the Model 6512, disable zero correct and suppress.
10. Using Table 7-3 as a guide, select the next electrometer
range and calibrator range, and repeat the basic proce-
dure in steps 3 through 9. Calibrate all the electrometer
ranges listed in the table.
NOTE: Use AMPS (active) mode of Model 263 to source current.
7.4.11 Coulombs calibration
Use the following procedure to calibrate the 20nC range.
Once this range is calibrated, the two remaining ranges are
automatically calibrated.
1. Connect the Model 263 Calibrator/Source to the Model
6512, as shown in Figure 7-3.
2. Place the Model 6512 in the coulombs function, and se-
lect the 20nC range.
3. While in standby, program the Model 263 to source
19.0000nC.
4. On the Model 6512, enable zero check and then zero
correct. Disable zero check, and enable suppress to null
the effects of zero check hop.
5. Press the OPERATE button on the Model 263. The cal-
ibrator will source for one second.
6. Adjust the display of the Model 6512 for a reading of
19.000nC using the ADJUST buttons of the Model 6512.
7. Repeat steps 4 through 6 until the reading on the Model
6512 reads 19.000nC after OPERATE is pressed on the
Model 263 calibrator.
8. Enable the Model 6512 zero check mode.
Table 7-3
Model 6512 amps calibration summary
6512 & 263
range
263 output
current
6512 reading
200pA
20nA
20µA
20mA
190.000pA
19.0000nA
19.000µA
19.000mA
190.00pA
19.000nA
19.000µA
19.000mA
Figure 7-3
Connections for Model 6512 calibration
OUTPUT
2-SL0T
TRIAX
CABLE
INPUT
MODEL 263
MODEL 6512
6171 3-SLOT MALE TO
2-LUG FEMALE TRIAX ADAPTER
COM
BANANA CABLE
COMMON
Summary of Contents for 6512
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