[Test-Equipment] TV-7 Calibration

[DW Holtman]

John,

Thank you for the great information. I will use it.

Best,
DW Holtman

----- Original Message ----- 
From: "J Forster" <jfor at quik.com>
To: "Discussion of Electronic Test Equipment" 
<test-equipment at mailman.qth.net>
Sent: Thursday, October 11, 2007 10:20 AM
Subject: Re: [Test-Equipment] TV-7 Calibration


> Sure, if you know the characteristics of the TS-352. What you need is:
>
> Voltage scale for the test
> Ohms/Volt spec
>
> the loading will be a resistor equal to  [Scale} x [Ohms/Volt]
>
> For example, if the scale is 5 Volts and the TS-352 is 1000 Ohms/Volt, the 
> load you need to apply to the circuit is 5000 Ohms.
>
> This assumes the meter you are actually using is much higher input 
> resistance than what is called for. If this is not true, you reed to 
> calculate the parallel resistance of the meter and resistor to be equal to 
> that of the TS-352.
>
> Best,
> -John
>
>
>
> DW Holtman wrote:
>
>> 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.
>>
>> Best,
>> DW Holtman
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