Calibration Errors - Protek 9216A User Manual

Calibration Errors

These error messages can be generated by the open, short, and standard calibration
procedures. If the 9216A fails calibration, try running the procedure again. Repeated
failure can indicate a hardware problem. The parameter limits are fixed and are set so
that all units should easily calibrate within those limits. The messages are listed alphabet-
ically, also listed is the status value returned by the *CAL? command.
Message
Cal Error
Cal Error
Cal Error
Cal Error
RS-232 Problems
Make sure that the RS-232 baud rate, parity, and word size are set to match that ex-
pected by the controlling computer. The default settings are 1200 baud, no parity, 8 bit
data. The 9216A always sends two stop bits, and will correctly receive data sent with ei-
ther one or two stop bits.
When connecting to a PC, use a standard PC serial cable, not a "null-modem" cable.
The 9216A is a DCE (Data Communications Equipment) device, and so should be con-
nected with a "staight" cable to a DTE device (Data Terminal Equipment).
"minimum" cable will pass pins 2, 3 and 7. For hardware handshaking, pins 5 and 20
(CTS and DTR) should be passed. Occasionally, pin 6 and 8 (DSR and CD) will be
needed; these lines are always asserted by the 9216A.
0 the 100 k range failed
1 the 6.4 k range failed
the 400  range failed
2
the 25  range failed
3
Status Meaning
1 The measurement is bad due to overload, A/D error, or math
error. This error can occur during short circuit, open circuit,
and standard resistor calibration.
2 The impedance measured in the short circuit calibration was
too large. The 9216A expects the impedance to be < 50 ,
and the resistance to be less than 10 . Make sure that the
fixture has a good low impedance short in it during short cir-
cuit calibration.
3 The impedance measured in the open circuit calibration is too
small. The 9216A expects the impedance to be > 10 k at all
frequencies and ranges. Make sure that there are no parts in
the fixture during open circuit calibration. Also, keep hands
and other objects away from the fixture during calibration.
4 Standard resistor calibration error. The 9216A expects that
standard resistor calibration will not change the value of the in-
ternal resistors by more than + 3%. Check to be sure that the
correct calibration resistor for the range being calibrated is in
the fixture.
42
The