• dry-contact inputs 3 dry-contact channels
• each channel detects main contact and insertion resistor contact
• timing windows 1 second, 10 seconds, or 20 seconds
• timing resolutions ±50 micro-seconds @ 1 sec. duration, ±500 micro-seconds @ 10 sec. duration, ±1.0 milli-seconds @ 20 sec. duration
• breaker operations Initiate Open, Close, Open-Close, Close-Open, Open-Close-Open
• Stand-alone, microcomputer-driven EHV Circuit Breaker Analyzer
• Analyzes contact time, stroke, velocity, over-travel, and contact wipe
• USB PC interface
• USB Flash drive interface
• Can store up to 200 test records and 100 test plans
• Built-in thermal printer

The Vanguard DIGITMR S2 is an inexpensive, easy to use digital circuit breaker analyzer. The DIGITMR S2 can be operated stand-alone or can be computer-controlled. It can fully analyze a circuit-breaker’s performance by testing the contact time, stroke, velocity, over-travel, and contact wipe. Contact and motion analysis can be performed for all breaker contact operations (Open, Close, Open – Close, Close – Open, and Open – Close – Open). Timing results are recorded and displayed on the 240 x 128 pixels back-lit LCD screen and can also be printed on the built-in 4.5" wide thermal printer.

Contact Timing Inputs

Dry-contact input channels are used for timing

circuit-breaker contacts. Each contact input

channel can detect main contact and insertionresistor

contact times in milli-seconds and cycles.

Three contact timing channels are available

on the DIGITMR S2.

Breaker Stroke and Velocity

One digital transducer input channel is available

to measure circuit breaker contact stroke,

velocity, over-travel, and bounce-back. With the

use of a Vanguard digital travel transducer, no

set-up calibration is required before testing. A

special feature is also available to “Slow-Close”

test a circuit breaker and obtain test results. An

optional Resistor Transducer Adapter Device can

be used to interface with any resistor transducer.

Built-in Thermal Printer

The DIGITMR S2 features a built-in 4.5” wide

thermal printer that can print test results in both

tabulated and graphic format.

Voltage Monitoring Input

One analog input channel, designated as (V1), is

dedicated to monitoring the substation DC supply

or coil voltage (0-255 Volts, DC or peak AC).

A second voltage input channel, designated as

V2, is dedicated to detecting voltage On/Off

status (presence or absence). This input can be

used to monitor the status of an A/B switch.

Circuit Breaker Initiate Feature

A built-in solid-state initiate device is used to

operate the circuit breaker from the DIGITMR

S2. Operational modes include Open, Close,

Open-Close, Close-Open, and Open-Close-

Open. Multiple operations such as Open-Close,

Close-Open, and Open-Close-Open can be

initiated using a programmable delay or by

sensing the circuit breaker’s contact condition.

The circuit breaker coil current amplitudes and

waveforms are recorded and can be printed on

the thermal printer.

Computer Interface

One USB interface port and one optional Bluetooth

interface is available for computer-control. Vanguard's

Windows®- based Circuit Breaker Analyzer application

is included with each DIGITMR S2. The software can be

used to control the unit, review test records, and create

circuit breaker test plans. Test records can be exported

to PDF, Excel, and XML format. All future software updates

can be downloaded from the Vanguard web site at

no additional charge.

User Interface

The DIGITMR features a back-lit (256 x 128 pixels)

graphic LCD screen to display menus and test results.

A convenient, rugged, 44-key QWERTY-style keypad is

used to control the unit and enter data.

CT Input

One non-contact AC current sensor is used to

monitor circuit breaker on-line current for the

“on-line” timing mode.