Questions &Answers
Regarding the Hardware & Firmware of the AN-2000


After replacing the firmware with a new version, I have got a "beeping problem" on my AN-2000. I get rid of it only by turning the power OFF and ON.

The AN-2000 should not beep!!! It does only a small beep when it resets the CPU (the short time between power-on to software
reset of all peripherals on the CPU board). The circuit in the new mainframe has a new reset circuit with a shorter relaxation time than the old one. Please wait 1-2 seconds between ON to OFF and vice versa.
If you still get a continuous beep, it means that either you have some line voltage interruptions or that the connectors of the power supply/CPU board are not touching the bus board. If so, you should put the AN-2000 on a table, with the front panel facing down, remove the CPU board, Test channel and the power supply, clean their contacts, let them dry and return them back to their slots. When they are inside the slots, push them firmly into the slot, until you are sure that all modules are all the way inside.

When in ANFLOW program and request scope mode, scope of turbulence intensity, or other VIEW screens, I get "Loss of data synchronization error" . What can I do?

The problem is with the DMA cable. Check all of the connections between the AN-2000 and the SPD500 box and the PC. Check whether the cable was damaged.

Special Offer

The GAGE4000, which may be used for measuring ambient temperature (using a thermocouple sensor) and Humidity. This unit is attached to the AN-2000 via the RS-232 cable and measures those parameters (or one of them) whenever you save data to file. This data (saved in ASCII into the header) is needed for Temp. and RH compensation of your data. The price of this unit, including the two sensors, cables and manual is only US$280.- and it can also be operated from LABVIEW as a stand alone measurement and control system. It has three digital I/Os - one of them might be configured as a counter, PWM or Analog output, Excitation 0V +/- 5V, three fast A/D inputs (8 bits), two general purpose A/D inputs (18 bits, 1 Hz.), one Thermocouple input, etc.






I have difficulty with my resistance measurements - what do I do?

Probably the calibration in one of the channels has been corrupted. You can re-calibrate that channel by performing the calibration procedure below:

   1) Prepare two reference resistors soldered to a pair of MALE BNC plugs. The total resistance of these resistors (including the BNC contact) should be 0.5 and 5 ohms. Please use a high accuracy multi meter capable of measuring 0.01 ohms with +/- 0.005 ohms accuracy.
   2) In the AN-2000 software select SETUP => SYSTEM => AUTO R COEF, then enter the number of channel you want to calibrate. Press CONTINUE to confirm.
   3) The system will prompt you eight times to connect both resistance values to the four Bridge ratios (total of eight combinations). Connect the resistors you have prepared, according to the instructions on the screen, DIRECTLY to the PROBE BNC of the channel.
   4)The system will ask you to switch the channel to one of the four bridge ratios: 1:1,1:2,1:10,1:20.
These bridge ratios are set using the two switches on the back of the channel module: POWER and BR. RATIO, where the POWER switch is used to switch between 1:1 or 1:10 to 1:2 or 1:20 using the
NORMAL and HIGH positions, respectively.
   5) After the calibration is done, exit the SETUP menu and reset the instrument.

I am experiencing some trouble with my RS-232 communication channel. What are the possible solutions?

Listed below are suggested solutions to the common problems with RS-232 communication.

The serial communication in the AN-2000 CPU and in the ANFLOW software are done via a 16550 UART (communication IC). There are several things which might cause an RS-232 communication error ("Error # xx, RS-232 transmission error" or "AN-2000 is no connected" etc.):
The serial port parameters are not set the same on both sides (i.e. on the ANFLOW software and in the AN-2000 internal setup).

Solution: Please follow the instructions in the manual.

Bad cable. The RS-232 cable is not connected, or the cable has a cut in the middle or the cable has been pulled out of either of the connectors.

Solution: Replace the cable by using a 1:1 cable wiring (pin#1 to pin#1, pin#2 to pin#2 etc.

The RS-232 fault came after a power failure / short circuit, or computer memory/disk problem. That probably caused the corruption of the non-volatile memory in the AN-2000, the UART setup or the rs_setup.cfg file in the ANFLOW directory.

1) Turn off the power of the AN-2000. Remove the CPU module out of its slot for 1 minute, then return it. That will erase the non-volatile memory, and reset it to the default parameters.

2) Erase the files C:\ANFLOW\rs_setup.cfg and C:\LINFLOW\rs_setup.cfg .
Turn off the PC (to reset the UART IC). Turn on the PC and the AN-2000 and run the software. The software and the AN-2000 will run on default parameters (9600,n,8,1,p through the port in the PC card, using IRQ# 5).
3) If there is any conflict with another card in the PC, or the cable has been connected to COM1, COM2 or the card using IRQ#10,you will get the error message again. If you received that error message, you will need to set the RS-232 parameters again (both in ANFLOW and in LINFLOW).

Remove any resident programs in your AUTOEXEC.BAT and CONFIG.SYS files.
      REMEMBER: you should reboot the PC after removing those programs. Please refer to the manual for more information.

Please check if the Motherboard of your PC or the BIOS setups were changed since the last time it worked. Sometimes, those parameters should influence the communication of the software with the PC card. You may also try to run the card with the software on another PC.

Did you install a modem / SCSI /sound blaster card recently? there might be an address/IRQ conflict. Try to remove those cards. If it solves the problem, change their configuration and try again.

If all of the above doesn't help - please contact us.

Common Operation Problems

I see a lot of 60, 120, 180 Hz noise on my CCA signal. What's wrong? (50, 100, 150 Hz. for Europe and Asia).

The 60 Hz signal that you see (in any anemometer) in CCA mode (only!!!) and its harmonics (120Hz, 180Hz. etc. ) are caused by the physical nature of the CCA circuit. The CCA does not have a feedback loop (like CTA) which cancels all such noises.
It is actually very similar to an antenna amplifier (a current source that feeds the "Antenna" and a voltage amplifier).
Therefore, it collects all the noises from the environment (including 60 Hz. of course) and high frequency noises as well.

   1) Take the cable away from any transformers, motors etc.
   2) Use a new cable with good shielding (also try magnetic shielding).
   3) Remove and transfer the internal power supply to a separate mainframe, by using the power supply ext. mounting kit.
   4) Try to ground one side of the cable to an "Earth" ground.

There is a "drift" of 0.3 V at the CCA channels during 24 Hours. Is this O.K.?

Consider the sensitivity of your CCA channel - it depends on the sensor current, sensor's "Alfa", Gain etc. Check what TEMPERATURE SCALE you are using - it could be that 0.3V is equal to 0.01deg.C, in some cases. Check the drift and accuracy parameters of your thermocouple and reference instrument.

I am trying to work at an OHR of 1.01 and measure temperature. Why do I get sensitivity to velocity?

About working with OHR of 1.01: in theory it is possible, but it is not accurate. Use it only if you have no other choice. The velocit sensitivity that you received is because you had some error in the adjustment of the sensor or cable resistance. Try to do it again or try OHR of 1.00 or even 0.99 (to compensate for the adjustment errors).

For more information please contact us at:

Head Office: 33 Hayetzira St., Ramat-Gan 52521, ISRAEL. Tel: 972-3-5756327, Fax: 972-3-5756326
U.S.A office: 3607 Silverside Rd., Wilmington, DE19810. Tel: (302) 478-2881, Fax: (302) 478-7956

Copyright 2000, A.A.Lab Systems Ltd.

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