Dear Roger,

After doing many experiences with DT800 (I am a newbie with datataker). Now I have connected to DT800: 1 load cell, 1 thermocouple K, and 2 strain gages (full bridge).

I can put it measuring with normal time interval. I read in some tutorials about Burst mode. I need to measure data with normal time interval and sometimes when a car passes on load cell in the road.

So if I connect a wire between D1 and GND I can arm the burst mode. I have done this experience, but sometimes the burst works, but don't save data, sometimes, arms but never stops. I need the burst mode armed by a digital signal during about 5 seconds and about 100 or 200 samples/sec.

Can you please give some tips?

Thanks Best regards,
CPalha

Without knowing how you have the burst mode set up there is very little I can do to assist.

I think your approach is not the best. You either run burst mode or you sample at a regular interval. The burst mode takes too long to load up and start to be able to measure a random event like a car driving over a bridge

As for not saving data that can only happen if logging is turned off.

Dear Teo

Thanks for the prompt help.

I will need to save the temperature under thee road at regular intervals (I configure schedule A) and for acquiring the pressure cells I think to use burst mode. Probably 1 thousands of sample will be enough for a truck with maximum 70 km/h.

If you think I don't need burst mode, can you help me to configure a Digital port for the "manual trigger". When i close the circuit it starts saving in schedule B.

Here is my first program (If is any problem I'm using the Delogger4 with Windows 7).

'JOB=JOB1
'COMPILED=2011/08/22 23:13:34
'deLogger generated program file for dataTaker 8 series
DT=\d
BEGIN"JOB1"
CATTN
'Spans and polynomial declarations
S1=0,100,483,100000"kPa"
'Thermistor declarations
'Switches declarations

'Parameter declarations
P31=3
'Global declarations
RS1S
'main schedule definitions

'schedule definition
RA5S LOGONA GA
1BGV(4W,S1,"pressurecell1")
2TK("temp2")
3R(4W,"vertical_strain")

'schedule definition
RB:1~W;BURST(8,4000,LEVEL,50,4S) LOGONB GB
1BGV(4W,S1,"pressurecell1")
END
'end of program file

Best regard,
CPalha

Good morning CPalha,

You will have to use burst mode to read the high part of your project.
The problem is you can't do both the temperature measurements and capture the burst data.

You will have to choose either the temperature data or the high speed data.

From the moment the digital input triggers the burst mode to start to when the burst mode actually starts running will be several seconds in which time the truck will probably be past the measuring point.

It would be better to have the DT800 in burst mode waiting for a trigger and have a second logger recording the temperatures.

Cheers,
Roger

Good morning Roger

Where I can find the tutorial about burst mode DT800?

I saw another example that they used a wire between the D1 and GND, and a wires between the sensor and port 1. I don't understand the example, because i don't understand who gives the starting, the D1 or the level in port1? Or must be the 2 conditions at the same time?

If I create a level in the pressure sensor (getting data in burst) I will need the wire between D1 and GND?

Best regards,
Carlos Palha

Good morning cpalha,

Yes there are two parts to burst mode:

1. The schedule that calls the burst mode to load
   The example shows using a digital input to start the schedule that loads the burst sampling. It could be a set schedule rate if you wish.

2. Triggering the burst
   Once in burst mode if you are using the pre-trigger function then you need a condition to capture the data. This can be when a signal gets over a set point or a digital input.

Cheers,
Roger