272 Appendix F
Error Messages
Error number:
Warning Messages (WARNING)
Warning messages are displayed to warn users. They are displayed in the lower row of the
display of the 4288A. You cannot read them out using the GPIB command.
WARNING: Need corr meas
When the OPEN compensation, SHORT compensation or LOAD compensation is ON, this
is displayed when you change the setup of the cable length or measurement frequency shift
(1 MHz). In this case, the OPEN compensation, SHORT compensation and LOAD
compensation are automatically turned OFF.
WARNING: Need load meas
This is displayed when you turn ON the LOAD compensation from the front panel
although the setups of the cable length and measurement frequency shift (1 MHz) differ
from those when measuring/setting up the LOAD compensation data. In this case, the
LOAD compensation is turned ON, but you need to measure the LOAD compensation data
again for accurate measurement.
WARNING: Need open meas
This is displayed when you turn ON the OPEN compensation from the front panel although
the setups of the cable length and measurement frequency shift (1 MHz) differ from those
when measuring/setting up the OPEN compensation data. In this case, the OPEN
compensation is turned ON, but you need to measure the OPEN compensation data again
for accurate measurement.
WARNING: Need short meas
This is displayed when you turn ON the SHORT compensation from the front panel
although the setups of the cable length and measurement frequency shift (1 MHz) differ
from those when measuring/setting up the SHORT compensation data. In this case, the
SHORT compensation is turned ON, but you need to measure the SHORT compensation
data again for accurate measurement.
WARNING: Out of limit
This is displayed if the compensation data is out of the valid range when measuring the
compensation data. The valid range for each type of compensation is as follows.
In the above table, Y is the measured admittance value, Z is the measured impedance
value, and Zref is the LOAD compensation standard definition value.
Type of compensation Valid range
OPEN compensation |Y| < 20
µS
SHORT compensation |Z| < 20
Ω
LOAD compensation |Zref| × 0.9 < |Z| < |Zref| × 1.1
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