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vrf fetch1?

Question asked by VRFuser on Dec 11, 2003

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"><HTML><HEAD><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"><META NAME="Generator" CONTENT="MS Exchange Server version 5.5.2653.12"><TITLE>fetch1?</TITLE></HEAD><BODY>Im trying to do a TOTALIZE measurement with a E1420B CounterTimer. The manual states that you must use the INITiate and FETch commands, verses the READ to get the readings out of the buffer. I am setting the C/T up with no errors, at least it is reporting no errors, and I can perform a FETC1? command which should fetch the data. My question: What is the next command I use to get the data out of my direct I/O object? When I use the READ command I simply put READ X in my direct I/O object and the data is at the output pin X of that object. As always, thanks in advance Ross--- You are currently subscribed to vrf as: rsb@soco.agilent.com To subscribe send a blank email to "join-vrf@it.lists.it.agilent.com". To unsubscribe send a blank email to "leave-vrf@it.lists.it.agilent.com". To send messages to this mailing list, email "vrf@agilent.com". If you need help with the mailing list send a message to "owner-vrf@it.lists.it.agilent.com".</BODY></HTML>

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jay.johannes Dec 11, 2003 12:17 AM
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<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:st1="urn:schemas-microsoft-com:office:smarttags" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 11 (filtered medium)"><title>fetch1?</title><o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PostalCode"/><o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="State"/><o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="City"/><o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"/><o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="Street"/><o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="address"/><style></style></head><body lang=EN-US link=blue vlink=purple><div class=Section1>Don’t confuse the READ? SCPI commandwith VEE’s Direct I/O command. The READ? is an ascii string sent to theinstrument. The direct I/O object is a VEE instruction for reading from theGPIB port. Short answer, use the READ X command without fear.<o:p></o:p><o:p> </o:p>Quick SCPI lesson. The reason that thecounter needs to use INIT and FETCH? Is that the TOTALIZE command. Unlike othersis not a gated measurement. It doesn’t have a completion criteria builtin like other measurements. So you can send INIT and then any number of FETCH?Queries you want, seeing the totalize results up to that point.<o:p></o:p><o:p> </o:p><div>Jay Nemeth-Johannes<fontcolor=navy><o:p></o:p>Complete Test<fontcolor=navy><o:p></o:p><st1:Street w:st="on"><st1:address w:st="on">720 SW 14th Street</st1:address></st1:Street><fontcolor=navy><o:p></o:p><st1:place w:st="on"><st1:City w:st="on">Loveland</st1:City>, <st1:State w:st="on">Colorado</st1:State> <st1:PostalCode w:st="on">80537</st1:PostalCode></st1:place><fontcolor=navy><o:p></o:p><spanstyle='font-size:12.0pt;color:navy'> <o:p></o:p>www.completetest.com<o:p></o:p></div><div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div class=MsoNormal align=center style='text-align:center'><hr size=2 width="100%" align=center tabindex=-1></div>From: Ross Bledsoe[mailto:RBLEDSOE@Coinco.com]
Sent: Thursday, December 11, 20033:42 PM
To: VRF
Subject: [vrf] fetch1?<o:p></o:p></div><o:p> </o:p>Imtrying to do a TOTALIZE measurement with a E1420B CounterTimer. Themanual states that you must use the INITiate and FETch commands, verses theREAD to get the readings out of the buffer. I am setting the C/T up withno errors, at least it is reporting no errors, and I can perform a FETC1?command which should fetch the data. <o:p></o:p>Myquestion: What is the next command I use to get the data out of my directI/O object? When I use the READ command I simply put READ X in my directI/O object and the data is at the output pin X of that object. <o:p></o:p>Asalways, thanks in advance
Ross <o:p></o:p>---
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VRFuser Dec 11, 2003 12:19 AM
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> Im trying to do a TOTALIZE measurement with a E1420B CounterTimer.
> The manual states that you must use the INITiate and FETch commands,

That should be the "FETch?"

> verses the READ to get the readings out of the buffer.

And that should be the "READ?" command. (I'm being picky for a reason.)

> I am setting the C/T up with no errors, at least it is reporting no
errors,
> and I can perform a FETC1? command which should fetch the data.
> My question: What is the next command I use to get the data out of my
> direct I/O object? When I use the READ command I simply put READ X
> in my direct I/O object and the data is at the output pin X of that
object.

This is why I was being picky. The "READ?" and the "FETCH?"
commands/queries
above are SCPI Syntax that you send to the instrument. The READ X in the
Direct I/O
is an instruction to VEE to get data from GPIB. You still use the READ X
whether you
have sent "FETCH?" or "READ?" to the instrument.

Les Hammer
Partner
Complete Test
720 SW 14th St.
Loveland, CO. 80537
Les.Hammer@CompleteTest.com

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