Special Considerations - HP E1313A Manual

Special
Considerations
Maximum Tare
Capability
Changing Gains or
Filters
Unexpected Channel
Offsets or Overloads
140 Understanding the HP E1313/E1413
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Here are some things to keep in mind when using
The tare value that can be compensated for is dependent on the instrument
range and SCP channel gain settings. The following table lists these limits:
Table 4-6. Maximum CALibration:TARE Offsets
A/D range Offset V
± ± V F.Scale
Gain x1
16 3.2213
4 .82101
1 .23061
.25 .07581
.0625 .03792
If you decide to change a channel's SCP setup after a
operation you must perform a
constants and reset the " range floor" for the stored Tare value. You must
also consider the tare capability of the range/gain setup you are changing to.
For instance, if the actual offset present is 0.6 Volts and was " Tared" for a
4 Volt range/Gain x1 setup, moving to a 1 Volt range/Gain x1 setup will
return overload values for that channel since the 1 Volt range is below the
range floor as set by
CALibration:TARE
in Chapter 5 for more on values returned for overload
FORMat[:DATA]
readings.
This can occur when your HP E1313/E1413's Flash Memory contains
offset constants that are no longer appropriate for its
CALibration:TARE
current application. Execute
the tare constants in RAM. Measure the affected channels again. If the
problems go away, you can now reset the tare constants in Flash memory by
executing CALibration:STORe TARE
CALibration:TARE
Offset V Offset V
Gain x8 Gain x16
.40104 .20009
.10101 .05007
.02721 .01317
.00786 .00349
.00312 .00112
CALibration:TARE
*CAL? operation to generate new DAC
. See the table under
CALibration:TARE:RESet
.
.
Offset V
Gain x64
.04970
.01220
.00297
.00055
n/a
then to reset
*CAL?
Chapter 4