Trek 668B User Manual

Model 668B

Precision, High-Voltage
Reference Supply

! Output Voltage Range

0 to +3 kV DC
0 to -3 kV DC

! Output Current Range

0 to ±5 mA DC

! Output Accuracy

The Trek Model 668B is a precision, high-voltage, reference
power supply with an adjustable output voltage range of 0 to
3 kV DC or 0 to -3 kV DC and an output current capability of up to
±5 mA DC.

Front panel push-buttons are used to select the desired output
voltage with 100 mV resolution. Each decade of the output
voltage is independently controlled by its own set of up and
down push buttons.

Current control is provided by front panel selection of either
supply trip-off or limiting at the preset current value.

Nine programmable memory locations are provided for saving
and recalling frequently used output voltage and current
settings.

A voltage setting (including polarity) and a current limit or trip
value can be stored in each memory location.

The memory locations can be accessed from the front panel or
through an optional digital communications interface.

An easy-to-read, sixteen-character LED display indicates the
output voltage, the current limit or current value, as well as the
memory location currently selected.

The Digital Enable feature provides a connection for a TTL
signal or a switching device to turn on and off the high voltage
remotely. The optional digital communications interface is well
suited for automated test equipment applications.

Better than 0.015%
of Full Scale

! Nine Programmable

Memory locations

! Adjustable Current Limit

or Current Trip Value

! Optional Digital

Communications
Interface

! Easy-to-Read

16-Character
LED Display

! Easy-to-Use

The 668B can be operated on a bench top or, with optional
hardware, in a 19-inch rack.

Measurement and Power Solutions

www.trekinc.com

Push-Button
Controls

TM

Model 668B Specifications

All specifications are with no load unless otherwise noted.

Model 10/40A Specifications

Output General Features (cont.)

Output Voltage Range

Adjustable from 0 to +3 kV DC or
0 to -3 kV DC.

Output Voltage Resolution

100 mV.

Output Current Range

0 to ±5 mA DC.

Performance

Output Voltage Accuracy

Better than 0.015% of full scale.

Zero Offset Voltage

Less than 50 mV.

Output Noise

Less than 15 mV rms (measured using
the true rms feature of the Hewlett
Packard Model 34401A digital
multimeter).

Regulation

Line

Better than 0.0025% for a line change
from 90 V to 126 V AC or 180 V to
250 V AC.

Load

Better than 0.0025% for a load change
from 0 to 5 mA.

Stability

Drift with Time

Less than 2 ppm/month,
noncumulative.

Drift with Temperature

Less than 25 ppm/°C.

Line Supply

90 to 126 V AC or 180 to 250 V AC ±10%,
at 50-60 Hz (specify when ordering).

Operating Conditions

Temperature

5 °C to 35 °C.

Relative Humidity

To 75%, noncondensing.

Features

Front Panel Display

A sixteen (16) character LED display that
indicates the output voltage, the current
limit/trip setting, and the memory
location.

Front Panel Voltage Control

High Voltage On/Off

Individual push buttons.

Voltage Selection

Up and down push buttons that
independently control each of the
5 digits of the displayed voltage.

Polarity

Push-button selectable.

Zero

Push button that commands the output
to zero volts.

Current Limit/Trip

Current LIMIT or current TRIP is selected
using a single push-button switch. The
value is adjustable from 1 mA to 5 mA
with push buttons. A LIMIT or TRIP
indicator will flash when the instrument is
in a current limit or trip condition.

Current Limit/Trip Resolution

1 mA.

Current Limit/Trip Accuracy

Better than 10% of setting.

Memory

Nine (9) programmable memory locations
for frequently used output voltage and
current settings. A voltage setting
(including polarity) and a current value
can be stored in each memory location.

Mechanical

Dimensions

104 mm H x 438 mm W x 394 mm D,
(5.09" H x 17.25" W x 15.51" D).

Weight

6.9 kg (15.2 lb).

High-Voltage Output Connector

MHV connector.

Digital Enable Connector

BNC connector.

AC Line Receptacle

Standard three-prong AC line connector
with integral fuse holder.

Certification

TREK, INC. certifies that each Model 668B 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.

Digital Enable Feature

An open collector, TTL compatible input
to turn on and off the high-voltage output.
A TTL high will turn off the high voltage.
A TTL low will turn on the high voltage.

Copyright ã 2011 TREK, INC.
All specifications are subject to change.
1152/DEC

Model 668B Ordering Information

Model 668B Accessories

Item Part No. Item Part No.

HV Reference Supply (90 to 126 V AC) . . . . . . . . . . . . 668B-L Operator's Manual . . . . . . . . . . . . . . . . . . . . . . . 23070

HV Reference Supply (180 to 250 V AC) . . . . . . . . . . . . 668B-H MHV Mating Plug . . . . . . . . . . . . . . . . . . . . . . . . B3005

Line Cord (90 to 126 V AC) . . . . . . . . . . . . . . . . . . N5002

Line Cord (180 to 250 V AC). . . . . . . . . . . . . Contact factory

Model 604RA Rack Adapter (optional) . . . . . . . . . . . . C4102

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

585-798-3140 • 585-798-3106 (fax) • www.trekinc.com • [e-mail]