Author Topic: Rigol DS2000A use EXT TRIG as source for hardware Counter?  (Read 1404 times)

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Offline DIPLover

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Rigol DS2000A use EXT TRIG as source for hardware Counter?
« on: January 31, 2015, 03:20:40 AM »
From the DS2000A user manual, page 6-19 :

Press ? Measure->Counter to select CH1, CH2 or any channel of D0-D15 as the measurement source. 
Besides, the signal input from the [EXT TRIG] connector can also be used as measurement source.


I couldn't find anywhere in the UI that would let you select EXT TRIG as the counter source :(

Not a problem I tought, I'll just use SCPI because...

DS2000A Programmers manual, page 2-143 :
:MEASure:COUNter:SOURce
Syntax
:MEASure:COUNter:SOURce <sour>
:MEASure:COUNter:SOURce?
Description
Set or query the measurement source of the frequency counter or disable the frequency counter measurement.
Parameter
Return Format
The query returns D0, D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, CHAN1, CHAN2, EXT or OFF.


But selecting EXT as a source does nothing, the measurement is always 9.9e37 (which means no signal) and querying the source returns the previous source (chan1, chan2 or off).

Is there a way to use the EXT TRIG as a counter source as mentionned in both manuals?
 

Offline Rory

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Re: Rigol DS2000A use EXT TRIG as source for hardware Counter?
« Reply #1 on: January 31, 2015, 03:58:45 AM »
With my DS2072, (not A), using v3.00.SP1 firmware, the hardware counter works with the ext trig input but needs over 225mV p-p input using x1 probe or 2.25v p-p using x10 probe.  I also found the trigger threshold setting affects counter sensitivity when trigger source is EXT.
 

Offline DIPLover

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Re: Rigol DS2000A use EXT TRIG as source for hardware Counter?
« Reply #2 on: January 31, 2015, 04:21:41 AM »
Ah I'm using DS2072A with 02.01 firmware.

My signal is 2.5Vpp with coax cable (1x) so should not be a problem, I'll have to play with trigger level.

Do you have a way to select the counter on the scope or do you use SCPI commands?
« Last Edit: January 31, 2015, 04:30:41 AM by DIPLover »
 

Offline Rory

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Re: Rigol DS2000A use EXT TRIG as source for hardware Counter?
« Reply #3 on: January 31, 2015, 04:43:22 AM »
Measure menu front panel setting worked for me.
 

Offline DIPLover

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Re: Rigol DS2000A use EXT TRIG as source for hardware Counter?
« Reply #4 on: January 31, 2015, 08:38:41 AM »
I can confirm updating to the latest firmware fixes the issue on DS2072A.

EXT is available in measure menu and responds to SCPI commands correctly.

Thanks for your help Rory.
 


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