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THE PIN FUNCTION
Because the 1750 has a significant number of measurement parameters that are user defined and may
have an impact on measurement accuracy, a lockout feature is supplied with each 1750. This lockout
feature is referred to as a PIN function, which prevents unauthorized access to instrument settings
critical to the operation of the 1750. It also prevents an operator from accidentally changing the
instrument settings. The PIN function may be enabled or disabled by a user provided that the correct
code is entered to gain access to the PIN menu. The instrument settings which are protected by the
PIN function are as follows; Resistance Range, Trigger Mode, Delay Time, Communication Mode, Line
Frequency, and access to the Calibration menu.
Enabling or Disabling the PIN Function
To enable the PIN function, follow the steps below:
a) Press the [MENU/CLEAR] key then press the [0] key.
b) You will be prompted to enter a three-digit PIN code. Enter the three-digit code and press enter.
(Use the [MENU/CLEAR] key to erase numbers if necessary).
NOTE: The 1750 is shipped from the factory with a PIN of “555”
c) If the PIN function is off, then you will be prompted “Turn PIN ON?” If the PIN function is ON,
then you will be prompted “Turn PIN OFF?” To acknowledge turning the PIN function on or off,
simply press the [ENTER] key. A Message will appear on the display to acknowledge the PIN
functions new state before returning to the 1750s main display.
d) If you choose not to change the state of the PIN function, then simply press the [MENU/CLEAR]
key to prompt an error message. This will exit the PIN menu and return to the main display.
Changing a PIN Number
To change an existing PIN Number, follow the steps below:
a) Press the [MENU/CLEAR] key then press the [0] key.
b) You will be prompted to enter a three-digit PIN code. Enter the three-digit code and press enter.
(Use the [MENU/CLEAR] key to erase numbers if necessary).
c) If the PIN function is off, then you will be prompted “Turn PIN ON?” If the PIN function is ON,
then you will be prompted “Turn PIN OFF?”
d) Press the “0” key and the message, “Change PIN # ?” will appear on the screen.
e) Press the [ENTER] key and a new screen appears. This screen will show the old PIN number.
f) The PIN number is changed by keying in the new PIN numbers and pressing [ENTER]. You can
escape this screen without changing the old PIN number by pressing [MENU/CLEAR] > [ENTER].
(Use the [MENU/CLEAR] key to erase numbers if necessary).
To Disable an Unknown PIN
In case an unknown PIN number needs to be disabled, a “back door” has been created to bypass the
PIN function. To bypass the PIN function, simply enter the code, [9][9][9], as the PIN number. Upon
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