30
Using the Password to Access Calibration or Change the Password
With the password set, pressing
calibration
...
on the
UTILITIES
screen will now
show:
ENTER PASSWORD
----
When the correct password has been entered from the keyboard the display changes to the
opening screen of the calibration routine and calibration can proceed as described in the
Calibration Routine section. If an incorrect password is entered the message
INCORRECT
PASSWORD!
is shown for two seconds before the display reverts to the
UTILITIES
menu.
With the opening screen of the calibration routine displayed after correctly entering the password,
the password can be changed by pressing
password
...
soft
−
key and following the procedure
described in Setting the Password. If the password is set to 0000 again, password protection is
removed.
The password is held in Flash. In the event of the password being forgotten, contact the
manufacturer for help in resetting the instrument.
Calibration Routine
The calibration procedure proper is entered by pressing
continue
on the opening Calibration
screen; pressing
exit
returns the display to the
UTILITIES
menu. At each step the display
changes to prompt the user to adjust the rotary control or cursor keys, until the reading on the
specified instrument is at the value given. The cursor keys provide coarse adjustment, and the
rotary control fine adjustment. Pressing
next
increments the procedure to the next step;
pressing
prev
ious decrements back to the previous step. Alternatively, pressing
exit
returns the display to the last CAL screen at which the user can choose to either
save new
values,
recall old values
or
calibrate again.
The first two displays specify the connections and adjustment method. The subsequent displays,
CAL 01 to CAL 15, permit all adjustable parameters to be calibrated.
The full procedure is listed below; the name of the control signal being adjusted at each step and
the default DAC value are shown in brackets. The display itself shows a summary of the step
adjustment procedure and the actual DAC value.
CAL 01
Output DC offset zero; adjust for 0V ± 5mV (DCOFFSET, 0007).
CAL 02
Output DC ve full scale; adjust for 10V ± 20mV (DCOFFSET, -1973).
CAL 03
Output DC offset -ve full scale; check for -10V ± 20mV (DCOFFSET, 1959).
CAL 04
Multiplier control zero offset; adjust for minimum output (AMPL, 0008).
CAL 05
Multiplier offset; adjust for 0V +/-5mV (MULTOFST –1494).
CAL 06
Squarewave, note offset.
CAL 07
Waveform offset; adjust for CAL06 value ± 10mV (WAVOFST, -0293).
CAL 08
Waveform full-scale; adjust for 10V +/-10mV (AMPL, 1814).
CAL 09
Squarewave full scale; adjust for 10V ± 10mV (SQLEVEL, 0701).
CAL 10
–20dB output attenuator; adjust for 1V ± 1mV (AMPL, 1813).
CAL 11
–40dB output attenuator; adjust for 0·1V ± 0·1mV (AMPL, 1818).
CAL 12
–10dB intermediate attenuator; adjust for 3.16V ±10mV (AMPL 1798).
CAL 13
Squarewave symmetry (50%); adjust for 50us ± 0·1us (SYM, 0000). 10kHz
CAL 14
Squarewave symmetry (75%); adjust for 75us ± 0·1us (SYM, -0513). 10kHz
CAL 15
Clock calibrate. 10MHz at main and aux outputs; adjust to ±1ppm. Fail if outside
these limits, ±1700 shown on the display (CLKCAL).
