Atec Commtest-VB7 User Manual

Page 2

SPECIFICATIONS

vb7

DATA ANALYZERS

REMARKS

Sensor Input

Sensor input

2 channels

Simultaneous sampling

Compatible sensor types

Accelerometer, velocity,

displacement, current

AC coupled range

16 V peak-peak

Allows for ± 8 V sensor output

swing (± 80 g)

DC coupled ranges

0 V to 20 V, -10 V to 10 V,

-20 V to 0 V

E.g. for reading prox-probe gap

Connectors

2 x BNC (CH1/CH2)

Safety feature: Break-free

inline connector

Analog to digital conversion

24-bit ADC

Sensor excitation current

0 mA or 2.2 mA (configurable),

24 V maximum

2.2 mA required for ICP®-type

accelerometer

Sensor detection

Warns if short circuit or not

connected

Tachometer

Sensor

Laser sensor with reflective

tape

Sensor triggers on beam

reflection

Laser sensor range

10 cm to 2 m nominal

Depends on size of reflective

tape

Other Sensor types supported

Contact, TTL pulse,

Keyphasor

Optically isolated input

Power supply to sensor

5 V, 50 mA

TTL pulse rating

3.5 V (4 mA) min, 28 V (5 mA)

max, off-state 0.8 V

Keyphasor® thresholds

7.7 ± 0.5 V, 13.3 ± 0.8 V,

18.8 ± 1 V

Nominally 8 V, 13 V, 18 V

Speed range

10 to 300 000 RPM (0.2 to

5 kHz)

Pulse width at least 0.1 ms

Accuracy

+/- 0.1%

Output to drive strobe

Up to 140 Hz (8400 CPM)

Typical. Depends on strobe

type. Special cable required.

Parameter Indication

Maximum levels

> 1000 g (10 000 m/s2)

> 1000 in/sec (25 000 mm/s)

> 100 in (2500 mm),

> 10 000 amps

Effective limit is sensor

sensitivity and output voltage

Dynamic signal range

> 95 dB (typical at 400 line

resolution)

Harmonic distortion

Less than -70 dB typical

Other distortions and noise

are lower

Units

g or m/s2

in/s or mm/s

mil or mm or µm

adB, vdB, amps, user-defined

0-peak, peak-peak or RMS.

Auto-scale by 1000x when

required

US & SI options for both adB

& vdB

Magnitude & cursors

Overall RMS value, dual

cursors, harmonics

Digital readouts on chart

Base accuracy

± 1% (approx. 0.1 dB)

For DC level: % of full scale.

For AC signal: % of reading

High frequency attenuation

≤ 0.1 dB 100 Hz to 10 kHz

≤ 3 dB >10 kHz to 40 kHz

Attenuation tolerances are in

addition to base accuracy

AC coupling attenuation

≤ 0.1 dB 10 Hz to <100 Hz

≤ 3 dB 1 Hz to <10Hz

Attenuation due to Integration

≤ 0.1 dB 1 Hz to <100 Hz

≤ 1.5 dB 0.2 Hz to <1 Hz

≤ 0.1 dB 10 Hz to <100 Hz

≤ 1.5 dB 1 Hz to <10 Hz

Low freq. mode: When coupling

= DC, Fmax

≤ 100 Hz.

Normal mode: Applicable in all

other cases.

Values apply to single

integration (accel. to veloc.).

Double the values for double

integration (accel. to displ.).

Spectrum Display

Fmax ranges

25, 50, 100, 125, 150, 200,

300, 400, 500, 600, 800, 1000,

1200, 1600, 2000, 2500, 3000,

4000, 5000, 6000, 8000, 10 000,

15 000, 20 000, 30 000,

40 000 Hz

Or equivalent CPM values

Or orders-based from 1X to

999X

Fmin possible range

0 to Fmax

Instrument zeroes all spectral

lines below Fmin

Resolution

400, 800, 1600, 3200, 6400 lines

3200 lines max. for dual

channel measurements

Frequency scale

Hz, CPM, Orders

Linear scale with zooming

Amplitude scale

Acceleration, velocity,

displacement or current

Linear or log scales, auto or

manual scaling

Window shapes

Hanning, rectangular

Overlap

(0, 12.5, 25, 37.5, 50, 62.5, 75,

87.5) %

Dependent on Fmax and

number of lines

Number of averages

1, 2, 4, 8, 16, 32, 64, 128

Increases sampling time

proportionally

Averaging types

Linear, exponential,

peak hold, synchronous

SPECIFICATIONS

vb7

DATA ANALYZERS

REMARKS

Spectrum Display Continued

Demodulation bandwidths

23 bandwidth options

From 125 Hz to 1250 Hz up to

16 kHz to 20 kHz

6Pack

Up to 40 kHz & 3200 lines 1

channel

Up to 20 kHz & 1600 lines 2

channel

Spectrum and waveform for

low freq, high freq, demod.

Order tracking

Up to 6 kHz Fmax, Orders-based

Tachometer required, mounted

on high-speed shaft

Order tracking - Distortion

Less than -65 dB

Within 50% to 200% speed

variation during recording

Waveform Display

Number of samples

1024, 2048, 4096, 8192, 16 384

Time scale

10 ms to 256 seconds

Or orders based from 1 to

999 revs

Time synchronous averages

1, 2, 4, 8, 16, 32, 64, 128

Only available when

tachometer triggered

Long time waveform Fmax

25 Hz to 40 kHz

20 kHz dual channel

Long time waveform duration

14.7 million samples (total over

channels)

E.g. for Fmax 1 kHz, Fsample =

2.56 kHz and Duration= 1.6 hrs

Logging & Analysis

Output formats

LCD screen, Ascent, XML

Data storage

Dual 1 GB non-volatile flash

memories

Database mirror copy on

second flash memory

Data storage structure

Folders / machines / points /

locations / routes

No limits are applied, 50

character names

Max Folder size

10 000 measurement locations

Balancing

Planes

Up to 2 planes, 2 sensors

Speed range

30 to 60 000 RPM

Measurement type

Acceleration, velocity,

displacement

Weight modes

Angle 0° to 360°, fixed position,

circumference arc

E.g. weights on fan

blades, linear dist. around

circumference

Remove trial weights

Yes, No

Automatic recalculation

Manual data entry

Yes

Allows re-entry of previous

balance jobs

Storage

Against machines in data

structure

No limits applied

Display & Communication

Display

Graphic Grayscale LCD

White LED Backlight

Resolution & size

480 x 320 (HVGA), 5.5” (140

mm)

Readable in direct sunlight

Supported Languages

ENG, FRE, SPA, POR, RUS, CHI

Firmware releases in English,

Communication with PC

USB and Ethernet

PROFLASH allows instrument

software to be upgraded

USB host port

USB 2.0, supplying 5V, 250mA

Save folders to USB flash drive

Battery & Charger

Battery type

Custom Lithium Ion pack,

7.4 V, 4500 mAh

Operating time

10 hours

Backlight on (60 second

time-out)

Charger type

Internal charging,

automatic control

External power pack 12 V DC,

3 A output

Charge rate

3 A nominal

3 hours for complete charge

Mechanical

Size

9.9” W x 5.8” L x 2.4” H

(252 x 148x 60) mm

Weight

2.7 lb (1.2 kg)

Including battery and strap

Environmental

Operating temperature

14 °F to 122 °F (-10 to 50) °C

Storage temperature &

humidity

-4 °F to 140 °F (-20 to 60) °C,

95% RH

If storage exceeds 1 month: Up

to 95 F (35 C), 85% RH

EMC

EN61326

Ruggedness

4’ (1.2 m) drop onto concrete,

IP65

Procedure: 26 drops following

MIL-STD-810F-516.5-IV