[Test-Equipment] TV-7 Calibration

[James M. Walker]

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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