8508A
Users Manual
ADC Adjustment
ADC (analog to digital converter) adjustment aligns the different resolutions available
from the 8508A analog to digital converter, so that there are no significant differences in
readings when changing resolutions with a constant input value. It is recommended that
ADC CAL is only performed if performance verification indicates significant resolution
differences. If required, it is recommended that ADC adjustment is performed before any
other calibrations.
No external equipment or signals are required to perform ADC adjustment.
Procedure
1. Ensure that no signals are present on the 8508A inputs. The 8508A may be left
connected to the calibrator as shown above provided the calibrator output is set to
STANDBY.
2. On the 8508A, Press
CAL to enter the CALIBRATION menu, and select SPCL.
3. Select
Adc to initiate the adjustment operation, which will take approximately 3
minutes to complete.
Adjustment is complete when the
Busy legend goes out.
DC Voltage Adjustment
Warning
The Calibrator can deliver a lethal electric shock.
To avoid electric shock when performing the following adjustment
procedures:
• Never touch any lead or terminal unless you are absolutely certain
that no dangerous voltage is present.
• Make sure that signal leads are in a safe condition before you
handle them in any way.
Initial Setup
1. On the 8508A, press the
CAL key.
2. Press the
DCV key.
3. Press the
CONFIG key and deselect FILT.
4.
Press the DCV key and select 1 kV range.
5. In adjustment mode the resolution defaults to
RESL7 in the DCV function. It is
recommended that this resolution is used for adjustment of all DCV ranges.
6. Confirm that the 8508A is configured for internal guard (External Guard is
deselected) by checking that the
ExGd legend does not appear on the left-hand
display.
7. Ensure that the calibrator output is set to
STANDBY and configured for Internal
Guard (
EX GRD is deselected).
8. Connect the Calibrator to the 8508A as shown in Figure 6-1.
Note
After making the connections allow at least 30 minutes for thermal emfs in
the leads to stabilize.
6-14
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