Keysight Technologies E4981A, Service Manual

Page: 151 / 152

Appendix D 149
Error Messages
Warning Message
D.
Er
ro
r M
e
ssa
g
e
s
Warning Message
A warning message is dispalyed in the instrument status display area in the lower-left part
of the display. Pressing any of the front panel keys or executing the :DISP:CCL command
clears the message.
This message simply appears on the display since it is not known to remote environments
such as GPIB. This message is not displayed when another error message has been already
displayed in the instrument message/warning area.
The warning messages for this instrument are as follows.
WARNING: Need corr meas
When the OPEN correction, SHORT correction or LOAD correction 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 correction, SHORT correction and LOAD correction are
automatically turned OFF.
WARNING: Need load meas
This is displayed when you turn ON the LOAD correction 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 correction data. In this case, the LOAD correction is
turned ON, but you need to measure the LOAD correction data again for accurate
measurement.
WARNING: Need open meas
This is displayed when you turn ON the OPEN correction 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 correction data. In this case, the OPEN correction is
turned ON, but you need to measure the OPEN correction data again for accurate
measurement.
WARNING: Need short meas
This is displayed when you turn ON the SHORT correction 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 correction data. In this case, the SHORT correction
is turned ON, but you need to measure the SHORT correction data again for accurate
measurement.
WARNING: Out of limit
This is displayed if the correction data is out of the valid range when measuring the
correction data. The valid range for each type of correction is as follows.
In the above table, Y is the measured admittance value, Z is the measured impedance
value, and Zref is the LOAD correction standard definition value.
Type of correction Valid range
OPEN correction |Y| < 20
μ
S
SHORT correction |Z| < 20
Ω
LOAD correction |Zref|
∞
0.9 < |Z| < |Zref|
∞
1.1