Calibration Errors
These error messages can be generated by the open, short, and standard calibration procedures. If
the Model Z9216 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 alphabetically, also listed is the status value returned by
the *CAL? command.
Message
Status Meaning
Cal Error 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.
Cal Error 2 The impedance measured in the short circuit calibration was too large.
The Model Z9216 expects the impedance to be < 50 Ω, and the resistance
to be less than 10 Ω. Make sure that the fixture has a good low
impedance short in it during short circuit calibration.
Cal Error 3 The impedance measured in the open circuit calibration is too small. The
Model Z9216 expects the impedance to be > 10 kΩ 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.
Cal Error 4 Standard resistor calibration error. The Model Z9216 expects that
standard resistor calibration will not change the value of the internal
resistors by more than ± 3 %. Check to be sure that the correct calibration
resistor for the range being calibrated is in the fixture.
GPIB Problems
First, make sure that the GPIB interface is installed. Second, the GPIB address of the Model Z9216
must be set to match that expected by the controlling computer. The default GPIB address is 17, so it
is a good idea to use this address when writing programs for the Model Z9216. Any address from 0 to
30 may be set using the rear panel switches SW2.
The Model Z9216 will ignore its front panel keypad when Remote Enable (REM) has been
asserted by the GPIB. This "REMOTE" state is indicated by the REM LED. To return to LOCAL
operation (i.e. to enable the front panel), press the backspace key. Controlling programs may inhibit
the ability to return to LOCAL operation by asserting the Local-Lockout state (LLO).
A linefeed character is sent with End or Identify (EOI) to terminate strings from the Model Z9216.
Be certain that your GPIB controller has been configured to accept this sequence.
RS-232 Problems
Make sure that the RS-232 baud rate, parity, and word size are set to match that expected by the
controlling computer. The default settings are 1200 baud, no parity, 8 bit data. The Model Z9216
always sends two stop bits, and will correctly receive data sent with either one or two stop bits.
When connecting to a PC, use a standard PC serial cable, not a "null-modem" cable. The Model
Z9216 is a DCE (Data Communications Equipment) device, and so should be connected with a
"straight" cable to a DTE device (Data Terminal Equipment). The "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 Model Z9216.
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