AN-1003 Hot-Wire Anemometer
Technical Specification


Channel Specifications

CTA BRIDGE
  Non Linear, Constant Temperature type
Bridge Ratios 1:10 and 1:1
High Power mode 1:20 and 1:2
  Sensor Resistance Range
1:1 Bridge 0.5-99.9 Ohm
1:10 Bridge 0.5-9.99 Ohm
Probe Lead Resistance Compensation 0.2-1.2 Ohm
   Maximum Closed Loop Bandwidth
1:1 Bridge DC-120 kHz
1:10 Bridge DC-100 kHz
With option 04 DC-500 kHz
   Probe current
x1 drive 300 mA max
x2 drive 600 mA max
   Equivalent input noise
1:1 Bridge 1.6 nV/
1:10 Bridge 2.2 nV/
With option 01 400 pV/
Typical Hum induced in input 0.03 µ Vrms
All noise parameters are correct for one or all channels working simultaneously.
   Typical Output noise
5 µm Tungsten probe, OHR=1.5, U=0, B.W.=10 kHz 135 µ Vrms
The same, with option 01 60 µ Vrms
   Stability - Typical Input Drift
1:1 Bridge 0.5 µV/°C
1:10 Bridge 0.3 µV/°C
With option 01 (all bridge ratios ) Less than 0.1 µV/°C
Probe cable 5 m of RG174 or RG58A
Output Top of Bridge or amplifier output
 
CCA BRIDGE (Constant Current Anemometer, OPTION 11)
Fixed currents 1,2,5,10,20 mA
Variable current source 0.3- 30 mA
Selected current is displayed on test-Module
 
SIGNAL CONDITIONER
Output Voltages Range ±12V
Amplifier Gain (presetable to any gain in range) 1-20(can be ordered with 1-50 or 1-1000 ranges)
Gain accuracy ±0.5 %
DC Offset 0-10 V
Output Impedance 100 Ohm
Input Impedance 10 kOhm
Typical Input White Noise 30 nV
Frequency Range DC-100 kHz
Typical Equivalent Input Drift (Gain 1) 160 µV/°C
 
LOW-PASS FILTER
   Triple-pole Butterworth Filter, with 12 Cut-off frequencies in 2 bands
Lower band 300 Hz - 5 kHz (6 frequencies)
Upper band 7 Hz - 16 kHz (6 frequencies)
Other frequency bands can be ordered.  
 

Mainframe Specifications

POWER SUPPLY
Output Voltages ±15 V,±5 V
Maximum current (@ ±15 V) 4 A ( 7A with option 10 )
Hum and Noise 100 µ Vrms
Can drive 10 channels @ 1:10 bridge ratio,
or 5 channels @ 1:1 bridge ratio.
Option 10 can drive all ten channels in 1:1 or 1:10 modes,simultaneously.
 
TEST MODULE
   Pulse Generator
Frequency Voltage 2 kHz
Duty Cycle 50% or 0.2%
Rise Time 50 nSec
Output Voltages 0.1 V
Accuracy 100 ppm/°C, 0.1 %
Function selects Automatic input/output connection according to selected    function.
Channel Selector Digitally controlled, gold plated contacts.

In normal operation, all channels except one are disconnected from the Test Module, to prevent additional noise inputs from external devices or cross-talking.

All noise parameters are correct for one or all channels working simultaneously.

  
 
The Hot-Wire Anemometer works with almost any Hot-Wire sensor and Hot-Film sensor made by any manufacturer.
Unit is CE rated (satety & noise & immunity).
       


 

The typical frequency response graph
was plotted according to data taken  
from AN-1003 Hot-Wire Anemometer
witjh options 01 & 04. The amplitude
is realative to the 1 kHz amplitude.

  1 mV P.T.P. @
200 kHz Bandwidth





For more information please contact us at:

Head Office: 33 Hayetzira St., Ramat-Gan 52521, ISRAEL. Tel: 972-3-5756327, Fax: 972-3-57563260
U.S.A office: 3607 Silverside Rd., Wilmington, DE19810. Tel: (302) 478-2881, Fax: (302) 478-7956
E-mail:info@lab-systems.com

© Copyright 2000, A.A.Lab Systems Ltd.

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