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Introductory Model 821HH Infinitron®
Hand-held Contacting Electrostatic Voltmeter

The Trek Model 821HH Infinitron® Hand-Held Electrostatic Voltmeter represents the next generation of contacting precision surface voltage measuring instruments which provide input characteristics far beyond the limits of any currently available hand-held voltmeter product.

Featuring an input capacitance of less than 0.01 pF and an input resistance of greater than 100 TΩ, the Model 821HH can easily measure the voltage level of both conductive and insulative objects and surfaces with virtually zero charge transfer to the measurement probe.

This results in stable high accuracy voltage measurement capability for ESD sensitive components such as semiconductors, LEDs, MR head sensors, etc., without the fear of generating an ESD event upon contact.

The “no ESD event” capability is due to the probe tips assuming the voltage level of the measured object surface as the tip approaches. Thus at the point of actual contact the tip is already at the voltage level of the measured object/surface, which results in no current flow at the time of contact.






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Performance


Measurement Range
0 to ±2 kV DC.

Accuracy

At the Voltage Monitor Output
Better than ±1% of full scale.

At the Voltage Display
Better than ±1% of full scale, ±1 digit.

Bandwidth (-3 dB)
1000V pp sine wave: better than 1kHz (-3dB).

Input Characteristics
Resistance greater than 1 x 1014Ω
Capacitance less than 1 x 10-14F

Stability
Drift with Time (probe in free air)
Less than 2 V/second.

Features

Displayed Information

Voltage Display Range
0 to ±2000V at a resolution of 1V.

Zero Offset

Battery Status

Time/Date

Temperature

Maximum and Minimum Readings

Automatic Shutoff
User setable: 5 minutes, 10 minutes, 15 minutes or disabled

Voltage Monitor Output
An output provides a low-voltage replica of the measured voltage (1.3mm jack).

Scale
1/1000th of measured voltage.

Offset Voltage
Less than ±10 mV.

Output Noise
Less than 10 mV rms
(measured using the true rms feature of the Hewlett Packard Model 34401A digital multimeter).

Speed of Response (10% to 90%)
Less than 500 μs for an input step change of 1kV.

Power ON/OFF
A push-button switch.

Record / Hold
Pressing the Record/Bold button will hold the measurement, while pressing and holding the Record / Hold button will record and store the reading.

Menu
A push-button switch for entering the menu system to Review Data, Erase Memory and Set Auto Off functions.

General

Power Requirements
Internal NiMH battery or an
external 15 V 1Amp supply/charger.

Operating Time
>8 hours of continuous operation.

Ground Reference Receptacle
Banana jack.

Operating Conditions
Temperature
15°C to 35° C

Relative Humidity
5% to 75%, noncondensing.

Dimensions
240 mm H x 140 mm W x 52 ½ mm D
(9 ½”H x 5 ½ W x 2” D)

Weight
1.13 kg (2.5 lb) with battery.

Voltage Monitor Connector
2.5 mm plug.

Accessories Supplied

Operator’s Manual.
15V @ 1 Amp, universal input AC/DC adapter.
Output Monitor Cable with 2.5 mm plug.
USB Cable.

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