Monroe-electronics Electrostatic Fieldmeter - Portable - model 257D Manuale Utente Scaricare il pdf (Pagina 6)

Section 4

OPERATION

The POWER, BACKLIGHT and RANGE switches on the front panel are push/push

toggles and need to be depressed for at least a half second for the unit to respond. The

TEST switch is a momentary. Pressing the POWER switch once turns power ON and

pressing a second time turns power OFF. Pressing the TEST switch performs a system

test and releasing it resumes normal operation.

A. POWER – Press for ON, press for OFF –performs this function for either AC or

battery operation.

B. BACKLIGHT – At power up, in both AC and DC operation the backlight and status

light are on. Subsequent pressing of the backlight button will cycle as follows:

Both Off

Status Light Only

Backlight Only

Backlight and Status Light

C. RANGE – Toggles between 2 kV/cm and 20 kV/cm range. Normally, start with the

high range and increase sensitivity for better resolution if the field is less than 2

kV/cm.

D. TEST – In a normally functioning system when this button is pressed, the meter and

output will immediately go to a significantly more negative value than the measured

value and then return to the measured value when the button is released.

E. ZERO – This 10-turn potentiometer zeros the instrument to accommodate offsets

generated in the probe. Total span is equivalent to about 300 volts when the probe

is immersed in a zero field. It should be set to produce an indicated value of zero

(with the probe in a zero field). See Section 6 for more details.

F. STATUS – The STATUS light is a tri-color (and OFF) LED.

AC Power,

Unit ON

LED Green

DC Power,

Unit ON

Battery OK LED Amber

DC Power,

Unit ON

Low Battery LED

Alternates

Red/Green

When a low battery condition (< 10.5v DC operation) is detected the display

backlight will blink ON and OFF for 5 minutes and then the unit will shut down.

When in AC operation and power OFF, if charge > 100ma the status light will

blink yellow if it is on. Pressing the backlight switch will toggle it ON/OFF.

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Monroe-electronics Electrostatic Fieldmeter - Portable - model 257D Manuale Utente Pagina 6