Seaward IRT 1557 - Manual (Page 11)

IRT1557
Operating Instructions
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4 Unit Description
The IRT 1557 is a hand held, insulation resistance and
continuity tester. Tests are selected using the rotary
switch.
4.1 Identifying parts of the unit
The numbering below refers to fig. 1 and fig. 2.
1. LCD Display
2. Function keys
3. TEST key
4. Rotary Switch
5. Test lead inputs
4.2 Keypad operation
Key Function
Buzzer ON/OFF
LOCK function
Zero Test lead resistance null
Backlight ON/OFF
TEST Start measurement