1-10 Front Panel Operation Model 6517A Getting Started Manual
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/disable zero check.
2. Enable or disable guard as needed. See “Guarding” at the end of this procedure.
NOTE
With guard enabled (ON), the “Grd” message is displayed. However, if zero cor-
rect is already enabled (“ZCor” displayed), then “Grd” will not be displayed.
3. To achieve optimum accuracy for low voltage measurements, zero correct the
Model 6517A. 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
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 1-3A shows connec-
tions for unguarded measurements, and Figure 1-3B 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 1-3
B
) 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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