Calibration Program
The Model 617 must be placed in the calibration program
in order to perform the front panel digital calibration pro-
cedures. Select the calibration program as follows:
Turn off the instrument for at least three seconds if it
is presently turned on.
Press and hold the PROGRAM SELECT button and
then turn on the power.
The instrument powers up as normal, but the CAL pro-
gram is accessible in the program menu.
Select the calibration program by pressing PROGRAM
SELECT repeatedly until the following message is
displayed briefly:
CAL
A normal reading will now be displayed except that the
exponent decimal points will be dislayed to indicate that
the instrument is in the calibration mode.
With the instrument in the calibration mode, perform the
following procedures to calibrate the Model 6l7 from the
front panel.
Amps Calibration
Calibration of the amps function should be performed in
the following order: ZOOpA, 2OnA, ZOfi, and 2OmA ranges.
Once these ranges are calibrated, the remaining ranges are
automatically calibrated. Use the AMPS (active) function
of the Model 263 to source current. Proceed as follows:
1. Connect the Model 263 Calibrator/Source to the Model
677 as shown in Figure 9.
2. Place the Model 617 in the amps function and select
the 2OOpA range.
3. On the Model 6l7, enable zero check and zero correct
in that order.
4. Program the Model 263 to output OO.OO+A and release
zero check on the Model 617.
5. After allowing the reading to settle for a few seconds,
zero the display of the Model 617 by pressing
suPPREss.
6. Program the Model 263 to output 19O.OOOpA.
7. Adjust the display of the Model 617 to read 19OOOpA
using the ADJUST buttons of the Model 617.
8. Program the Model 263 to output OO.OOOpA by press-
ing ZERO on the Model 263.
9. On the Model 617, disable zero correct and suppress.
10. Using Table 5 as a guide, select the next electrometer
range and calibrator range, and repeat the basic pro-
cedure in steps 3 through 9. Calibrate all the elec-
trometer ranges listed in the table.
Table 5. Model 617 Amps Calibration
263 Output
617 Range 263 Range current 617 Reading
200 pA 200 pA 190.000 pA 190.00 pA
20 n‘4
20 IL4 19.oooonA
19.ooonA
20 PA 20 fiA 19.0000 PA
19.000 pA
2OIl-A 2OIL4 19.oooom4 19.ooomA
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
617 as shown in Figure 9.
2. Place the Model 617 in the coulombs function and select
the 20nC range.
3. While in standby, program the Model 263 to source
19,OOOOnC.
4. On the Model 617, enable zero check and then zero cor-
rect. Disable zero check and enable suppress to null the
effects of zero check hop.
5. Press the OPERATE button on the Model 263. The
calibrator will source for one second.
6. Adjust the display of the Model 617 for a reading of
19.000nC using the ADJUST buttons of the Model 617.
7. Repeat steps 4 through 6 until the reading on the Model
617 reads 19.000nC after OPERATE is pressed on the
calibrator.
8. Place the Model 677 in zero check.
Volts Calibration
Calibration of the volts function should be performed in
the following order: 2OOmV, 2V, ZOV, and 200V ranges. The
2OOV range will require that an external 19OV source be ap-
plied to the Model 263. Proceed as follows:
1. Connect the Model 263 to the Model 617 as shown in
Figure 9.
A-11
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