64 cHAPTER 8: Service
Model 425 Gaussmeter
5. Check that the USB driver is installed properly and that the device is functioning.
In Microsoft Windows®, the device status can be checked using the Device Man-
ager. Click Ports (COM & LPT) or Other Devices in the device type list, and then
right-click Lake Shore Model 425 gaussmeter. Click Properties.
8.3.3 Intermittent
Lockups
1. Check cable connections and length.
2. Increase delay between all commands to 100 ms to make sure instrument is not
being overloaded.
3. Ensure that the USB cable is not unplugged and that the Model 425 is not pow-
ered down while the com port is open.
The USB driver creates a com port when the USB connection is detected, and removes the
com port when the USB connection is no longer detected. Removal of the com port while
in use by software can cause the software to lock up or crash.
8.4 Line Voltage
The Model 425 will operate between the range of 100 VAC to 240 VAC, 50 Hz or 60 Hz
configurations so that it can be operated from line power anywhere in the world. No
manual switches need to be configured for different voltage operations.
8.5 Factory Reset
Menu
It is sometimes necessary to reset instrument parameter values to factory defaults.
Instrument parameters are stored in nonvolatile memory called EEPROM, and can be
cleared without affecting instrument calibration.
8.5.1 Default Values
The factory defaults can be reset using the factory reset menu. To access the factory
reset menu, press and hold Escape for 3 s. The firmware version screen will appear;
press Enter to advance to the instrument serial number information screen, and
press Enter to go onto the factory reset menu. Once the menu appears, set default
values to yes, then press Enter to confirm and execute the reset. Press Escape at any
time to return to the normal display. Default parameter values are listed in TABLE 8-1
Menu navigation:
Escape (press and hold for 3 s)
Interface command: DFLT
Parameter Default
Measurement
Measurement mode DC
DC filter On
RMS measurement band Narrow
Autorange On
Field compensation On
Max hold Off
Relative Off
Display
Brightness 10%
Field units Gauss
Alarm and relay
Alarm Off
Alarm mode Magnitude
Alarm trigger Outside
Alarm audible On
Alarm sort On
Relay Off
Keypad locking Mode Unlocked
TABLE 8-1 Default parameter values
To Next Page
Loading...
