Trek 323 User Manual

Model 323

High-Sensitivity , DC Stable Electrostatic Voltmeter

! Measurement Range:

0 to ±100 V DC or Peak AC

! Sensitivity: 5 mV

! Speed of Response:

Less than 300 ms for a 100 V step

! Measurement Accuracy:

Better Than 0.05% of Full

The Trek Model 323 Electrostatic Voltmeter performs highly sensitive voltage measurements using a variety of Trek sideview probes with various body types (round, square).

The Model 323 is a versatile instrument used for a variety of electrostatic applications including materials evaluation, electret studies, charge accumulation on disk drive assemblies, and other extremely sensitive ESD sensitive components.

The Model 323 is specifically designed for high sensitivity applications and performs highly accurate, noncontacting measurement of electrostatic potentials of 0 to 100 V over a wide range of probe-to-surface distances.

The Model 323 has adjustments to compensate for many sensitive testing conditions. The response Speed control adjusts the speed/noise tradeoff of the AC response. The Drift/Spacing Null Adjustment

offset voltage as the probe to test surface spacing changes.

minimizes the variation in zero

Scale

! Null Voltage Source:

10 Volt Nulling Supply

! Response Speed Control:

AC Response Adjusted for Speed/Noise

! Drift Spacing/Null

Adjustment: Minimizes Variations in voltage values as probe to test surface spacing changes

! Available Monitor Outputs:

The front panel has an easy to read 3½ digit LED display. The detected output voltage can be monitored through a 1:1 voltage monitor output and a switch selectable scale of 10:1 or 20:1 voltage monitor output.

Trek patented low impedance probes assure measurement accuracy essentially independent of probe-to-test-surface spacing, humidity conditions, and contamination such as airborne dust, toner, ions and chemicals.

Measurement and Power Solutions

www.trekinc.com

1:1 of Voltage Monitor Output 10:1 or 20:1 (switch selectable)

! Additional Probes Available

! Compliant

Model 323 Specifications

All specifications are with a Model 6000B-8 probe with a probe-to-surface separation of 1 mm.

Model 10/40A Specifications

Performance Features (cont.) Features (cont.)

Measurement Range Probe-to-Surface Separation Voltage Monitor Output

0 to ±100 V DC or peak AC. 1 mm to 3 mm. A buffered 0 to ±10 V output

providing a representation of the

measured voltage.

Scale Factors

10:1 of the measured voltage or 20:1 of the measured voltage

(switch selectable).

Output Current

5 mA.

Output Impedance

0.1 W, nominal.

General

Dimensions

108 mm H x 223 mm W x 380 mm D (4.25" H x 8.75" W x 15" D).

Weight

3.6 kg (8 lb).

Voltage Monitor Connector

BNC connector.

Ground Receptacle

Banana jack.

AC Line Cord Receptacle

Standard three-prong line cord with integral fuse holder.

Line Supply

Factory set for one of two voltage ranges: 90 to 127 V AC or 180 to 250 V AC, at 48 to 63 Hz (specify when ordering).

Operating Conditions

Temperature

0 °C to 40 °C.

Relative Humidity

To 90%, noncondensing.

Sensitivity

5 mV.

Accuracy

DC Accuracy

Better than 0.05% of full scale.

Voltage Monitor Output

Better than ±0.05% of full scale.

Voltage Display

Better than or equal to ±2 counts, referred to the voltage monitor.

Speed of Response (10% to 90%)

Less than 300 ms for a 100 V step (adjustable).

Stability

Drift with Time

Less than 50 ppm/hour, noncumulative.

Drift with Temperature

1:1 Monitor Output

Less than 10 mV/°C

10:1 Monitor Output

Less than 5 mV/°C

20:1 Monitor Output

Less than 5 mV/°C

Features

Null Voltage Source

A calibrated 10-turn dial representing a 10 volt supply, with switch selectable polarity, used to produce zero volts output when the probe is coupled to a known zero volt surface.

Range

±10 volts

Accuracy

Resolution

20 mV.

Response Speed Control

A front panel potentiometer that adjusts the speed/noise interrelationship of the Model 323 AC response.

Voltage Display

3½ digit LED display.

Range

Switch selectable for ±10 V

or ±100 V full scale.

Resolution

10 V Range

0.01 V.

100 V Range

0.1 V.

Zero Offset

±2 counts, referred to the

voltage monitor.

Sampling Rate

3 readings per second.

Drift/Spacing Null Adjustment

This back panel adjustment minimizes the variation in monitored voltage values as the probe to test surface spacing changes.

Voltage Monitor Output (1:1 ratio)

A buffered 0 to ±100 V output providing a representation of the measured voltage.

Scale Factor

1:1 of the measured voltage.

Output Noise

Less than 20 mV rms (measured using the true rms feature of the Hewlett Packard Model 34401A digital multimeter).

Output Current

5 mA.

Output Impedance

100 W, nominal.

Model 323 Ordering Information

Model 323 Electrostatic Voltmeter Trek Certification

Item Part No.

Model 323-L (90 to 127 V AC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323-L

Model 323-H (180 to 250 V AC) . . . . . . . . . . . . . . . . . . . . . . . . . . 323-H

Probes

Model 6000B-8 Probe (side-viewing, round body) . . . . . . . . . . 17054

Model 6000B-16 Probe (side-viewing, square body) . . . . . . . . 17047

TREK, INC. • 190 Walnut Street • Lockport, NY 14094 • USA • 800-FOR TREK

(fax) • www.trekinc.com • sales@trekinc.com 716-438-7555 • 716-201-1804

TREK, INC. certifies that each Model 323 is tested and calibrated to specifications using measurement equipment traceable to the National Institute of Standards and Technology or traceable to consensus standards. A Certificate of Calibration accompanies each instrument when it is shipped from the factory.