3-2
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
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
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
.
The
Z-CHK
key is used to enable and disable zero check.
2.
Enable or disable guard as needed (see
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.
shows connections for
unguarded measurements, and
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
) should 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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