[Test-Equipment] TV-7 Calibration

[DW Holtman]

Jim,

Thank you for the great link, I will down load a copy of the manual.

Best,
DW Holtman
WB7SSN

----- Original Message ----- 
From: "James M. Walker" <chejmw at acsu.buffalo.edu>
To: "Discussion of Electronic Test Equipment" 
<test-equipment at mailman.qth.net>
Sent: Friday, October 12, 2007 6:49 AM
Subject: Re: [Test-Equipment] TV-7 Calibration


> If you would like the manuals in PDF for the TS-352 go to:
> http://eshop1.chem.buffalo.edu/test-bench-equip.html
>
> Scroll down to the TS-352 and click on the manual you want.
> The 4.5 volt batteries are available here in Buffalo, NY at The Battery 
> Store.
> Jim
> WB2FCN
> http://eshop1.chem.buffalo.edu
>
> ----- Original Message ----- 
> From: "DW Holtman" <tubestuff at comcast.net>
> To: "Discussion of Electronic Test Equipment" 
> <test-equipment at mailman.qth.net>
> Sent: Thursday, October 11, 2007 12:47 PM
> Subject: Re: [Test-Equipment] TV-7 Calibration
>
>
>> Robert,
>>
>> Great information. I should have specified, the voltage in question is AC 
>> volts, not DC Volts. Any idea if what the imput inpedance might be for a 
>> TS-352 type of VOM in the AC ranges?
>>
>> Thank you,
>> DW Holtman
>>
>> ----- Original Message ----- 
>> From: <WA5CAB at cs.com>
>> To: <test-equipment at mailman.qth.net>
>> Sent: Thursday, October 11, 2007 10:19 AM
>> Subject: Re: [Test-Equipment] TV-7 Calibration
>>
>>
>>> DW,
>>>
>>> As a philosophical statement, DVM's waste time when working on 
>>> boatanchor
>>> gear.  The natural tendency is to sit there and fool with the adjustment 
>>> until
>>> the meter or counter reads exactly what the book says.
>>>
>>> However, whether the meter impedance will make any difference to any 
>>> given
>>> measurement depends upon the source impedance.  It could make no 
>>> difference, a
>>> little difference or a bunch.  For example, the BC-611 maintenance 
>>> manuals give
>>> two charts for most test voltage settings, one using a battery operated 
>>> VTVM
>>> and one using another meter.  Some of the numbers are the same and some 
>>> are
>>> quite different.
>>>
>>> But if you want to make sure to set the thing the way it would have
>>> originally been set, the TS-382(*)/U is 1000 ohms per volt on all AC 
>>> ranges and
>>> selectable either 20,000 or 1000 on all DC ranges.  That being the case, 
>>> if the
>>> instructions don't tell you which to use, it's probably safe to assume 
>>> 20.000.  If
>>> you shunt the meter probes with (20,000 x full-scale range) ohms, the 
>>> TV-7
>>> won't know you aren't using a TS-382.  :-)
>>>
>>> In a message dated 10/11/2007 11:01:37 AM Central Daylight Time,
>>> tubestuff at comcast.net writes:
>>>> Hello,
>>>>
>>>> I'm getting ready to go through a TV-7/U, step by step using the Depot
>>>> manual (TM-11-6625-274-35). The first step, the bias voltage test calls 
>>>> out a test
>>>> setup then asks for a reading of 3.0 +_.1 Volts. I'm reading 5.26 
>>>> Volts.
>>>>
>>>> My question is this. The procedure calls for using a TS-352 Multimeter. 
>>>> The
>>>> only meters I have are high input impedance DVM and a VTVM. I know that 
>>>> a
>>>> TS-352 will load the circuit and cause a lower reading. Is there anyway 
>>>> to make
>>>> the necessary adjustments using a DVM or a VTVM? Is this a situation 
>>>> where I
>>>> will need to get a good quality VOM (Simpson 260 etc) to do the 
>>>> adjustments?
>>>> What is the ohms per volt on a TS-352?
>>>>
>>>> Thank you in advance for any suggestions.
>>>>
>>>
>>> Robert Downs - Houston
>>> <http://www.wa5cab.com> (Web Store)
>>> MVPA 9480
>>> <wa5cab at cs.com> (Primary email)
>>> <wa5cab at comcast.net> (Backup email)
>>>
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>>
>>
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>>
>
>
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