6517B-900-01 Rev. A / Jun 2008 Return to Section Topics 3-5
Model 6517B Electrometer User’s Manual Section 3: Basic Measurements
Resistance measurements
NOTE Accurate high resistance measurements require the use of a low-leakage test fixture.
The following procedure requires “BEN
CH” default settings (see Restoring bench defaults for
more information).
1. With zero check enabled (“ZeroCheck” displaye
d), select the ohms function by pressing R.
2. Select Auto V-Source ohms. In this mode, the V-Source is automatically set to a voltage
(nominally 40V or 400V) that optimizes measurement accuracy (see Auto V-Source for
more information). Note that default “BENCH” settings selects Manual V-Source ohms. In
this mode, you must manually set the V-Source level for the measurement. See Section 4
for details on using the V-Source.
WARNING Selecting Auto V-Source ohms may set the V-Source to 400V. Hazardous
voltages may be present on the output and guard terminals that could cause
personal injury or death.
3. Select a measurement range or use autoranging:
a. To automatically select the most sensitive range, enable autorange. The AUTO key
enables and disables autorange. When enabled, the AUTO annunciator is on.
b. For manual ranging, use the RANGE and
keys to select a measurement range
consistent with the expected resistance.
4. Connect the Model 6517B to the test fixture. Generic connections are shown in Figure 3-3.
Note that this connection scheme requires that ammeter LO be internally connected to
V-Source LO (see Configuring V-Source for more information). For optimum accuracy,
leakage currents in the test fixture can be cancelled by performing REL on the current
component of the measurement (see Amps Rel for more information).
5. Disable zero check by pressing OPER, then press Z-CHK to source voltage to the test
fixture device under test (DUT).
6. Take a reading from the display.
7. Place the V-Source in standby when finished by again pressing OPER.
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