rotary switch, or switched back on again by pressing the [TEST] button.
Backlight operation (LT320 and LT330)
The LT320 and LT330 LCD display may be backlit, to allow readings to be
seen in adverse lighting conditions. The backlight function can be selected
at any time while the instrument is switched on by pressing the
BACKLIGHT
J
button.
The backlight function will switch off automatically 15 seconds after the
instrument has finished testing.
Display warning symbols
G
Refer to user manual.
Any time the warning triangle is displayed the operator should refer to the
user manual for further information.
L
Range lock
Displayed at any time the [TEST] button is locked in the on position.
Battery condition indication. Refer to page 18.
f
Fuse blown indicator, appears when an instrument fuse has failed.
Refer to page 17.
>280V
Displayed on the LT310 indicates a supply voltage in excess of that
allowed is present.
>480V
Displayed on the LT320 indicates a supply voltage in excess of that
allowed is present.
hot
Indicates the instrument needs to cool down before it can continue
loop testing
Noise on the circuit under test may affect the reading
Setup procedure
Reverse polarity or line/neutral swapping
This feature is only available on the following models
LT310-EN-SC LT320-EN-SC
LT310-FR-SC
LT320-FR-SC
LT310-DE-SC
LT320-DE-SC
LT310-ES-SC
LT320-ES-SC
LT310-IT-SC
LT320-IT-SC
LT310-NL-SC
LT320-NL-SC
LT310-NO-SC
LT320-NO-SC
The set-up menu allows the user to change the way the instrument
behaves when testing on a supply with Line and Neutral connections
swapped. Tests may be permitted or prohibited.
To select Polarity reversal acceptance or rejection:
1. With the instrument switched OFF, hold down the [TEST] button and
turn the range knob to any ON position.
2. Keep the button held down until the instrument displays the ‘SET’
warning.
3. Now release the [TEST] button.
4. Press the [TEST] button again to view the current setting for
line/neutral swapping.
5. The display shows ‘L+L’ (instrument will perform tests with L & N
swapped) or ‘L+N’ (instrument will not perform tests with L & N
swapped).
6. Press the [LOCK] button or the PFC button to change the setting.
7. Press the [TEST] button to exit from the set-up menu.
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