Model 6517B Electrometer Reference Manual Section 16: Verification procedure
6517B-901-01 Rev. C / August 2015 16-13
Calculating ohms reading limits
Ohms reading limits must be calculated from the actual standard resistance value and the appropriate
Model 6517B specifications. For example, assume that the 2 GΩ range is being tested, and the
specifications are:
 Model 6517B 2 GΩ range accuracy: ±(0.225 % of reading + 1 count)
 1 GΩ resistor actual value: 1.025 GΩ
Calculated reading limits are as follows:
Reading limits = 1.025 GΩ ±[(1.025 GΩ  0.225 %) + 10 kΩ]
Reading limits = 1.025 GΩ ± 2.31625 MΩ
Reading limits = 1.02268 GΩ to 1.02732 GΩ
Before performing the ohms verification procedures, calculate the reading limits for each range, and
enter the limits where indicated in the Limits for ohms verification table.
Instrument setup
Before performing the ohms verification procedures, you must make certain that the instrument is
properly configured as follows. Failure to do so results in erroneous or erratic measurements.
Step 1: Select the auto voltage source mode
1. Press CONFIG and then R.
2. Select VSOURCE in the displayed menu, and then press ENTER.
3. Select AUTO in the VSOURCE SETTING menu, and then press ENTER.
4. Press EXIT to return to normal display.
Step 2: Select internal voltage source connections
1. Press CONFIG and then OPER.
2. Select METER-CONNECT in the CONFIGURE V-SOURCE menu, and then press ENTER.
3. Select ON in the SOURCE-METER CONNECT menu, and then press ENTER.
4. Press EXIT to return to normal display.
Step 3: Disable voltage source resistive limit
1. Press CONFIG and then OPER.
2. Select RESISTIVE-LIMIT in the displayed menu, and then press ENTER.
3. Select OFF, and then press ENTER.
4. Press EXIT to return to normal display.
Step 4: Remove ground link
Remove the shorting link between COMMON and chassis ground on the rear panel. Floating
COMMON eliminates ground loops that might result in noise problems.
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