MKS Ion Systems 775 Bedienungsanleitung

Electrostatic

Fieldmeter

Model 775

Instruction Manual

#19-0775-M Ver. 2

Contents

1 Description............................................................................ 1

2 Operation............................................................................... 2

Powering the Meter ............................................................................... 2

Battery Check ......................................................................................... 2

Zeroing the Meter .................................................................................. 2

Taking and Holding a Reading ............................................................... 3

Measurement Accuracy ......................................................................... 4

3 Maintenance......................................................................... 5

4 Specifications ...................................................................... 6

5 Warranty and Service ......................................................... 7

#19-0775-M 1 Ver. 2

Description

Ion Systems Model 775 Electrostatic Fieldmeter is a compact electro-

static fieldmeter used to accurately locate and measure static charge

potentials.

The 775 Fieldmeter features both Sample and Hold measurement

modes that allow measurements to be made in places that would be

difficult to reach or see with other instruments. A set of ranging

lights ensure accurate and repeatable measurement. No range

switching is required as the digital display covers the range of 0 to

±19.99 kilovolts. An analog output jack provides a 1 volt output

corresponding to a 10 kilovolt reading on the meter display. The

circuitry has been designed to make accurate measurements in areas

using air ionization.

The 775 Electrostatic Fieldmeter features

• Pocket-size convenience

• Sample and Hold measurement modes

• Distance ranging lights

• Conductive case and ground snap

• Digital display

• 9 Volt battery power

• Analog output

• A special designed for use in ionized areas

#19-0775-M 2 Ver. 2

Operation

Powering the Meter

The Model 775 has a slide switch for ON/OFF and a push button

switch for modes. The ZERO knob can be turned to the left or right

to change the zero setting of the display.

Push the slide switch actuator into its upper (ON) position. The

display will come on. To turn the meter OFF, slide the switch down

to its lower OFF position. The display should now be off.

Battery Check

After turning on power to the meter, check the display and make

sure that the low battery indicator “BAT” is not showing on the

display. If the “BAT” indicator is lit, replace the battery as described

in Chapter 3: Maintenance before using the meter.

Zeroing the Meter

Turn on the meter with the on/off switch. Put the meter in the

SAMPLE mode (up position). Place the meter 1 inch (2.54 cm) from

a grounded metal surface. If necessary, adjust the ZERO control

until the display reads zero.

#19-0775-M 3 Ver. 2

Taking and Holding a Reading

Place the meter 1 inch (2.54 cm) from the object to be measured.

This distance is measured from the stainless steel front panel to the

surface of the object. The meter now displays a reading of the elec-

trostatic field in kilovolts per inch.

With the meter in position 1 inch (2.54 cm) from the object being

measured, press the push-button so that it latches in the upper or

HOLD position. This freezes the reading on the display and allow the

meter to be moved to a position where it can be more easily read or

saved for later reference. When the meter is in the HOLD position,

the word HOLD will appear in the display.

Note The Model 775 is built in a conductive case that

provides the ground reference for the measuring

circuit. For accurate measurements and zeroing,

ensure that the person holding the meter

grounded or discharged by touching ground, or

that the meter is grounded using the ground snap

on the rear of the case.

Note In the SAMPLE position the RANGING LIGHTS

are on. The RANGING LIGHTS are provided to

help you place the meter at the correct distance

from an object. The lights are factory- adjusted to

produce a concentric ring bullseye pattern on a

flat, opaque surface 1 inch (2.54 cm) from the

front edge of the meter. This can most easily be

seen by aiming the meter at a sheet of white

paper.

#19-0775-M 4 Ver. 2

Measurement Accuracy

The accuracy of measurement is dependent on a stable ground refer-

ence and the 1 inch (2.54 cm) measuring distance as previously

noted. It is also dependent on the aspect ratio, relating the size of the

object to be measured to the measurement distance. This ratio

should be at least 3 for best accuracy, meaning that the object should

be at least a 3 inches square (7.62 cm square) when measuring at a 1

inch (2.54 cm) distance.

Accurate measurements may be made at other measurement

distances by scaling the meter range and observing the proper aspect

ratio. For example, at a measurement distance of 3 inches (7.62 cm),

multiply the meter reading by 3 to give a range of 0 to 59.97 kilovolts.

For accuracy, the object being measured at this distance should be at

least a 9 inches square (22.86 cm square).

Note In the HOLD position the RANGING LIGHTS are

off. When the push-button is returned to the

SAMPLE position, the RANGING LIGHTS goes on

and the word HOLD disappears from the display.

#19-0775-M 5 Ver. 2

Maintenance

The only maintenance necessary for the Model 775 Fieldmeter is

occasional changing of the 9V battery. Slide off the battery compart-

ment door on the back of the unit. Carefully remove the battery from

the compartment, noting the routing of the battery clip wires, and

detach the battery clip. Replace with a 9V alkaline battery of the same

type. Carefully reinsert the battery in the compartment, routing the

wires so that they do not interfere with the battery compartment

door. Slide the battery compartment door back into position.

The Model 775 Fieldmeter is factory-calibrated to an accuracy of

better than 5%. No attempts should be made to recalibrate the unit

without factory authorization. The accuracy of measurement is

dependent on stable ground reference and measurement at a precise

1 inch (2.54 cm) distance. The Model 775 Fieldmeter has a basic

accuracy of ±5% measured with 1000 volts on the plate.

#19-0775-M 6 Ver. 2

Specifications

Input: VDC alkaline battery, battery life in excess of 40 hours,

battery included

Display: 3 1/2 digits, 0.4" (1 cm) digit height

Output: Analog output through miniature jack, 1 V corresponds to 10

Reponse: 5 Hz at analog output, digital display updates 3 times per

second

Features: HOLD and low BATTERY indicators, automatic polarity

Controls: On/off slide switch, SAMPLE/HOLD pushbutton, ZERO

control

Range: ±0.00 to 19.99 KV at 1" (2.5 cm); higher voltages may be

measured at distances greater than 1"

Accuracy: ±5%, chopper stabilized (accuracy unaffected by air ioniza-

tion); least significant digit of display indicates tens of volts

Environment Operates at 0-40

Ground Ground through conductive case or snap fastener

Dimensions 4.2"L x 2.4"W x 0.9"D (10.7 x 6.1 x 2.3 cm)

Weight 5 oz. with battery (141.8 g)

Certifications

#19-0775-M 7 Ver. 2

Warranty and Service

Ion provides a limited warranty for the Model 775 Fieldmeter. New

products manufactured or sold by Ion are guaranteed to be free from

defects in material or workmanship for a period of two (2) years

from date of initial shipment. Ion’s liability under its new product

warranty is limited to servicing (evaluating, repairing, or replacing)

any unit returned to Ion that has not been subjected to misuse,

neglect, lack of routine maintenance, repair, alteration, or accident.

In no event shall Ion be liable for collateral or consequential

damages.

Caution: The 775 Fieldmeter is a precision electronic instrument. It

must not be subjected to extremes of shock and vibration. Damage

to the field sensor may result from dropping the unit from an exces-

sive height onto a hard surface. Such damage is not covered by the

warranty.

The case of the 775 Fieldmeter is sealed. Breaking the seal voids the

warranty.

To obtain service under this warranty, please contact Ion Technical

Support.

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