Extech Instruments 421509 User Manual download pdf (Page 7)

Lo Limit

Pin 3 (+)

Pin 4 (-)

Figure 4

Hi Limit

Pin 1 (+)

Pin 2 (-)

Figure 3

Pin 5

Pin 1

Figure 1

Pin 2

Pin 4

Pin 6

Pin 3

Pin 5 (+)

Pin 6 (-)

Figure 2

5to30V

Setup Mode

The operating functions for the setup mode are printed between the bracket “[ ]” signs on

each button. Press the SET [ ] button in normal mode to switch to the setup mode. The

indicator “SET” will be shown on the left side of the display. Press SET [ ] again to return to

normal mode.

Hi/Lo Limit Setup

In Setup Mode, press the [Limits] button to enter the Hi/Lo setup function. The “LIMIT”,

“HI”, and main display will blink on the LCD and the previous settings will be displayed.

Press the number buttons (printed in white) on the overlay to set Hi and Lo limit values.

The button “-“ (same as the ESC overlay) can be used to set a negative value. Setting is

from left to right digit. Press the ENTER button to confirm each setting.

Mini DIN Hi/Lo Alarm Output

The alarm output jack (refer to Figure 1), located on the top of the meter, can be used to

power external warning or switching devices when programmed Hi/Lo alarm limits are

reached. To enable this function, an external power source (5 to 30VDC, 5mA max) must

be used to supply power to the connected device. Connect the power source (5-30VDC)

between pin 5 (+) and pin 6 (-) of the connector (refer to Figure 2). For the Hi limit output,

connect a device between pin 1 (+) and pin 2 (-) (refer to Figure 3). For the Lo limit output,

connect a device between pin 3 (+) and pin 4 (-) (refer to Figure 4).

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

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Extech Instruments 421509 User Manual Page 7