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SECTION 3
Operation
+
3.10.2
Additional
Error
The accuracy specifications
are based on making meas-
urements
at the input connectors
of the instrument.
When using cables to connect to a DUT, additional error
is introduced
due to stray capacitance
and voltage drop.
Additional
Error in High Impedance
Region:
The additional error in the high impedance region that is
caused by test cables is summarized
in Table 3-5.
Additional
Error in Low Impedance
Region:
Test cables add the following error to I Z I measurements
of <2fiR:
l
120Hz, 1kHz: 0.2m Q
0 1OkHz: 0.3mQ
l
100kHz: 1.5mfi
Table 3-5.
Additional Error of I Z I Caused by
Test Cables (Reference Data)
3.11
ERROR MESSAGES
Errors may result from the following:
1. Self-check (power-up test or zero measurement
dur-
ing OPEN or SHORT correction).
2. Invalid front panel setting.
3. Programming
error over the GPIB bus.
On power-up,
the instrument
performs self-tests on its
memory elements and denotes a failure with one of the
following messages that cannot be cleared:
Self-test Failure Messages:
Message
Description
EEEEE
nnnnn
Memory Failure
where:
n=2
Invalid cal constants
n = 4-7
RAM error
n= 9
ROM error
The error messages
caused by improper
operation
that
are displayed by the instrument
are listed and explained
in Table 3-6.
It is
ossible to get the following
messages
on the IAl
and I5 B DISPLAYS if the instrument is exposed to exces-
sive noise fields:
IAIDISPLAY:
FFFFF
m
DISPLAY:
66666
To clear this error, turn off power and turn power back on
after three seconds. If this error occurs frequently, the in-
strument may be defective. Contact your sales represen-
tative or the factory.
Clearing Error Messages
Once an error message is displayed,
it will remain dis-
played until it is cleared by the operator. The instrument
is effectively
inoperable
while the error message is dis-
played.
Clear from front panel -
An error message can be
cleared by pressing any front panel key. In this case,
the operation inherent to the key does function.
Clear over the GPIB bus - An error can be reset by
sending the device clear command (DCL, SDC) over
the bus.
Note: If "EEEEE"
or "FFFFF" is displayed
on the
mDISPLAY
section or when an error number ex-
ceeds 50, the instrument is not functioning
properly.
Turn off power, and then turn power on again after
three seconds. If the error message does not clear, the
instrument is defective. Contact your sales represen-
tative or the factory.
3-20
+
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