Thermal Anemometry

The AN - 1002 is a Low Cost Mainframe made for AN - 1003 or AN - 1005 Hot-Wire and Hot-Film Anemometry Channels. This Mainframe is an Excellent Solution for Customers who Need a Low-Cost Mainframe for Housing Only One or Two Channels.

The Mainframe includes an Internal Pulse / Square Wave Generator for Running the Pulse Response Test and an Internal 100mV Voltage Reference for Calibration of the Amplifier’s Gain. It interfaces to an Oscilloscope and External Data Acquisition System via BNC’s on Front Panel.

Channel’s Setup is done with the Aid of an External Digital Voltmeter and an Oscilloscope. The Mainframe Includes an External Power Supply which Includes all Necessary Voltages for Driving 2 Channels.

Channel’s Specifications

C.T.A Bridge

C.C.A Bridge

Non-Linear Constant Temperature Type

Constant Current Anemometer, Option 11

Bridge Ratio:

1:10 and 1:1

Fixed Currents:

1, 2, 5, 10, 20mA and any Combination of those Current Levels

High Power Mode:

1:20 and 1:2

Variable Current Source:

0.3 - 30mA; Selected Current is Displayed on Test-Module

Sensor Resistance Range

Power Supply

1:1 Bridge:

0.5 - 99.9Ω (Ohm)

Output Voltages:

±15V, ±5V

1:10 Bridge:

1.0 - 9.99Ω (Ohm)

Maximum Current (@±15V):

±2.5A

Cable Resistance Compensation:

0.2 - 1.2Ω (Ohm)

Hum & Noise:

<100µVrms

Maximum Closed Loop Bandwidth

Signal Conditioner

1:1 Bridge:

DC - 120kHz

Output Voltage Range:

±12V

1:10 Bridge:

DC - 100kHz

Amplifier Gain:

1 - 20
Pre-settable to Any Gain in Range (May be Ordered with 1 - 50 or 1 - 100 Ranges)

With Option 04:

DC - 500kHz

Gain Accuracy:

0.5%

Maximum Probe Current

DC Offset:

0 - 10V

x1 Drive:

300mA Max.

Output Impedance

100Ω (Ohm)
50OΩ (Ohms) Available per request

x2 Drive:

600mA Max.

Input Impedance:

10kΩ

Equivalent Input Noise

Typical Input White Noise:

30nv/√Hz

1:1 Bridge:

1.6nV/√Hz

Frequency Range:

DC - 100kHz

1:10 Bridge:

2.2nV/√Hz

Typical Equivalent Input Drift:

160µV/°C

With Option 01:

400 Picovolts/√Hz

Low-Pass Filter
Triple Pole Butterworth Type
12 Cut-off Frequencies in 2 Bands
(Other Frequency Bands can be Ordered)

Typical Hum Induced in Input:

0.03µVrms

Lower Band:

300Hz - 5kHz
(6 Frequencies)

Typical Output Noise (5µm Tungsten Probe)

Upper Band:

7kHz - 16kHz
(6 Frequencies)

OHR=1.5, U=0, B.W.=10kHz

135µVrms

Test Module

The Same with Option 01:

60µVrms

Pulse Generator:

Stability: Typical Input Drift

Frequency:

2kHz

1:1 Bridge

0.5µV/°C

Duty Cycle:

0.1% or 50% Continuous

1:10 Bridge:

0.3µV/°C

Rise Time:

50nSec

Less than 0.1µV/°C With Option 01

DC Reference

Probe Cable:

5m of RG174 or RG58A

Output Voltages:

0.1V

Output:

Top of Bridge or Amplifier Output

Accuracy:

50ppm/°C, 0.1%

All Analog Outputs are available on Front Panel