3-2 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008
Section 3: Basic Measurements Model 6517B Electrometer User’s Manual
Introduction
This section provides information on taking basic measurements. For more detailed information,
see Section 4 and the Keithley Instruments Model 6517B Reference Manual.
Changing functions
To avoid erratic operation, always enable zero check (“ZeroCheck” displayed) before selecting one
of the other measurement functions (V, I, R, or Q). The Z-CHK key controls zero check (see Ze
ro
check fo
r more information)
Voltage measurements
Assuming “BENCH” reset conditions, the basic procedure is as follows:
1. With zero check enabled (“ZeroCheck” displayed), select the volts function by pressing V.
Th
e Z-CHK key is used to enable and disable zero check.
2. Enable or disable guard as needed (see Guarding for more information). Note that with
guard enabled (ON), the “Grd” message is displayed. However, if zero correct is already
enabled (“ZCor” displayed), then “Grd” will not be displayed.
3. To achieve optimum accuracy for low voltage measurements, zero correct the Model
6517B. To do this, use the RANGE key to select the lowest measurement range (2V)
and press REL. With zero correct enabled, the REL indicator is on. Note that with zero
correct enabled, the “ZCor” message is displayed. However, if guard is already enabled
(“Grd” displayed), then “ZCor” will not be displayed.
4. 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 voltage.
5. Connect the test cable(s) to the voltage to be measured. Figure 3-1A shows connections for
unguarded measurements, and Figure 3-1B shows connections for guarded
measurements.
WARNING Hazardous voltage may be present on the inner shield of the triax cable when
GUARD is on. A safety shield connected to safety earth ground (as shown in
Figure 3-1B) sh
ould be used for voltage measurements at or above 30V.
CAUTION Do not apply more than 250V peak (DC to 60Hz) to the input or instrument
damage may occur.
6. Press Z-CHK to disable zero check and take a reading from the display.
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