Front Panel
Detects overcurrent in the power line for equipment
under test and activates a protective device.
(Rated current : 20 A)
: ON (for normal measuring operation)
: OFF (idle condition or when overcurrent
protection device has been triggered)
See (p. 31)
Covers the terminal block to prevent electric shock.
Turn the circuit breaker off ( ) before opening the
cover.
See (p. 37)
Outputs voltage based on the power supplied to
[LINE IN] (p. 25).
Also used to connect the power cord of equipment
under test.
See (p. 36)
Five-inch liquid crystal display unit with a touch
panel function.
Also provided with input key functions.
The backlight (p. 136) can be set to turn OFF auto-
matically.
Turns the main instrument ON and OFF.
See (p. 38)
1. Circuit breaker
2. Terminal block cover
3. Terminal block
4. Liquid crystal display unit (LCD)
5. Power switch
Generates a beep sound when a key is pressed, and
activates a warning buzzer.
See (p. 135)
Used to adjust screen contrast.
Turning the dial to the right darkens the display; turn-
ing to the left lightens the display.
Use this dial when the display requires adjustment.
Insulates the voltage supplied to [LINE IN] (p. 25)
using the built-in transformer and outputs a 1:1 volt-
age from terminal T3. Effective only when B1 or B2
network is selected. (only ST5540)
See (p. 75)
Input 110% of the rated voltage to [LINE IN] (p.
25) using the isolation transformer to use the T3
terminal. The T3 terminal will only output a 110% of
the rated voltage when the same voltage is input to
[LINE IN].
Lights when high volltage is generated at the T1 - T3
terminals.
Used to measure leakage current other than Earth
leakage current. The T2 terminal is provided with a
protective fuse.
(fuse rating : 250 V, F50 mAL)
See (p. 75), (p. 282)
6. Buzzer
7. Contrast adjustment dial
8. 110% voltage output terminal (terminal T3)
9. Warning lamp
10. Measuring terminals (terminals T1)
11. Measuring terminals (terminals T2)
1
2
3
4
5
6
7
8
9
11
10
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