<div style="color:black;font: 12pt Arial, Helvetica, sans-serif;">
<div> <font size="3">That could be problematic. If the Stag gauges work like those in the TR4-6 there is a voltage stabilizer that maintains a constant average 10 volts on the gauge. But the original stabilizer is an early form of a PWM regulator. The contacts will alternately apply full battery volts and zero on a proportional basis such that the average is 10 volts. And the switching frequency is about one hertz. The gauges react slowly enough that they average it out just fine but if you put a voltmeter on it you will see the voltage switching on and off fast enough that your meter won't have time to settle out and give a meaningful reading. <br>
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<div><font size="3">There are after-market stabilizers available that use a solid-state IC voltage regulator providing a constant 10 volts. If you have one of those you could get a reliable reading. But that is if you have one of those.</font></div>
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<div><font size="3">All that said, if I had a resistance value for the gauge I could calculate what you would get if an IC stabilizer was installed.</font><br>
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<div style="clear:both"><font size="4">Dave </font><br>
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<div style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original Message-----<br>
From: Sujit Roy <triumphstag@gmail.com><br>
To: DAVID MASSEY <Dave1massey@cs.com><br>
Cc: Triumphs <triumphs@autox.team.net><br>
Sent: Sat, Aug 15, 2020 11:30 am<br>
Subject: Re: [TR] Thermal Transmitter Temperature Sender help<br>
<br>
<div id="yiv4365019461">
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<div>Follow up question. Does anyone have data showing what the voltage at the gauge should be to resistance values.</div>
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<div class="yiv4365019461yqt1673503800" id="yiv4365019461yqt12730">
<div class="yiv4365019461gmail_quote">
<div class="yiv4365019461gmail_attr" dir="ltr">On Fri, Aug 14, 2020, 12:15 PM DAVID MASSEY <<a rel="nofollow" shape="rect" ymailto="mailto:dave1massey@cs.com" target="_blank" href="mailto:dave1massey@cs.com">dave1massey@cs.com</a>> wrote:<br clear="none"></div>
<blockquote class="yiv4365019461gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
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<div> <font size="3">Here are some data for the TR8. This might be close enough for the stag:<br clear="none">
</font></div>
<div><font size="3">Temp C Temp F Orig ohms GTR110 ohms<br clear="none">
50 122 332 290<br clear="none">
55 131 275 242<br clear="none">
60 140 227 197<br clear="none">
65 149 193 169<br clear="none">
70 158 158 142<br clear="none">
75 167 134 120<br clear="none">
80 176 114 102<br clear="none">
85 185 99 91<br clear="none">
90 194 85 77<br clear="none">
95 203 74 65<br clear="none">
100 212 60 55<br clear="none">
105 221 51 48<br clear="none">
110 230 44 41<br clear="none">
115 239 37 37<br clear="none">
120 248 32 31<br clear="none">
125 257 28 28<br clear="none">
130 266 24 25<br clear="none">
135 275 21 22<br clear="none">
</font></div>
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<div><font size="3">If you have a source of resistors in this value range you can connect them in lieu of the sensor and check the reading to see if it is close.</font><br clear="none">
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<div style="clear:both;"><font size="4">Dave </font><br clear="none">
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<div style="font-family:arial, helvetica;font-size:10pt;color:black;">-----Original Message-----<br clear="none">
From: Sujit Roy <<a rel="nofollow" shape="rect" ymailto="mailto:triumphstag@gmail.com" target="_blank" href="mailto:triumphstag@gmail.com">triumphstag@gmail.com</a>><br clear="none">
To: Triumphs <<a rel="nofollow" shape="rect" ymailto="mailto:triumphs@autox.team.net" target="_blank" href="mailto:triumphs@autox.team.net">triumphs@autox.team.net</a>><br clear="none">
Sent: Fri, Aug 14, 2020 11:31 am<br clear="none">
Subject: [TR] Thermal Transmitter Temperature Sender help<br clear="none">
<br clear="none">
<div id="yiv4365019461m_-1604197066133898725yiv7413154317">
<div dir="ltr">I'm going to try and figure out if my Stag is running hot. The gauge always reads high
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<div>I found a note on another forum on how to test the voltage regulator, and another forum how to calibrate the gauge.</div>
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<div>I'm trying to figure out how to test the Thermal Transmitter Temperature Sender. Does anyone have any data on how the resistance changes with temperature?</div>
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<div>Since most Triumph around the 70's used Smith gauges, I'm assuming the data for the
Thermal Transmitter Temperature Sender would be the same.</div>
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<div>Regards, Sujit<br clear="all">
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-- <br clear="none">
<div dir="ltr">
<div dir="ltr">
<div>Sujit Roy<br clear="none">
Cupertino, California</div>
<div><br clear="none">
<a rel="nofollow" shape="rect" target="_blank" href="https://triumphstagblog.wordpress.com/">https://triumphstagblog.wordpress.com/</a><br clear="none">
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