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Piccolo Range<br />
9.1.3 To Check Thermocouple Input Calibration<br />
User <strong>Manual</strong><br />
Connect a milli-volt source, traceable <strong>to</strong> national standards, <strong>to</strong> term<strong>in</strong>als V+ and V- as shown <strong>in</strong> <strong>the</strong> diagram below.<br />
The mV source must be capable of simulat<strong>in</strong>g <strong>the</strong> <strong>the</strong>rmocouple cold junction temperature. It must be connected<br />
<strong>to</strong> <strong>the</strong> <strong>in</strong>strument us<strong>in</strong>g <strong>the</strong> correct type of <strong>the</strong>rmocouple compensat<strong>in</strong>g cable for <strong>the</strong> <strong>the</strong>rmocouple <strong>in</strong> use.<br />
Controller<br />
VI<br />
V+<br />
V-<br />
Thermocouple<br />
Compensat<strong>in</strong>g cable<br />
Thermocouple simula<strong>to</strong>r set<br />
<strong>to</strong> T/C type<br />
+<br />
-<br />
Set <strong>the</strong> mV source <strong>to</strong> <strong>the</strong> same <strong>the</strong>rmocouple type as that configured <strong>in</strong> <strong>the</strong> controller.<br />
Adjust <strong>the</strong> mV source for m<strong>in</strong>imum range. For a type J <strong>the</strong>rmocouple, for example, <strong>the</strong> m<strong>in</strong>imum range is -210 O C.<br />
However, if it has been restricted us<strong>in</strong>g <strong>the</strong> Range Low parameter <strong>the</strong>n set <strong>the</strong> mV source <strong>to</strong> this limit. Check that<br />
<strong>the</strong> read<strong>in</strong>g on <strong>the</strong> display is with<strong>in</strong> +0.25% of read<strong>in</strong>g + 1LSD.<br />
Adjust <strong>the</strong> mV source for <strong>to</strong> <strong>the</strong> maximum range. For a type J <strong>the</strong>rmocouple, for example, <strong>the</strong> m<strong>in</strong>imum range is<br />
1200 O C. However, if it has been restricted us<strong>in</strong>g <strong>the</strong> Range High parameter <strong>the</strong>n set <strong>the</strong> mV source <strong>to</strong> this limit.<br />
Check that <strong>the</strong> read<strong>in</strong>g on <strong>the</strong> display is with<strong>in</strong> +0.25% of read<strong>in</strong>g + 1LSD.<br />
Intermediate po<strong>in</strong>ts may be similarly checked if required.<br />
9.1.4 To Check RTD Input Calibration<br />
Connect a decade box with <strong>to</strong>tal resistance lower than 1K and resolution <strong>to</strong> two decimal places <strong>in</strong> place of <strong>the</strong> RTD<br />
as <strong>in</strong>dicated on <strong>the</strong> connection diagram below before <strong>the</strong> <strong>in</strong>strument is powered up. If at any <strong>in</strong>stant <strong>the</strong> <strong>in</strong>strument<br />
was powered up without this connection <strong>the</strong>n at least 10 m<strong>in</strong>utes must elapse from <strong>the</strong> time of res<strong>to</strong>r<strong>in</strong>g this<br />
connection before RTD calibration check can take place.<br />
Controller<br />
VI<br />
Matched impedance copper leads<br />
Decade Box<br />
V+<br />
V-<br />
The RTD range of <strong>the</strong> <strong>in</strong>strument is -200 <strong>to</strong> 850 O C. It is, however, unlikely that it will be necessary <strong>to</strong> check <strong>the</strong><br />
<strong>in</strong>strument over this full range.<br />
Set <strong>the</strong> resistance of <strong>the</strong> decade box <strong>to</strong> <strong>the</strong> m<strong>in</strong>imum range. For example 0 O C = 100.00Ω. Check <strong>the</strong> calibration is<br />
with<strong>in</strong> +0.25% of read<strong>in</strong>g + 1LSD.<br />
Set <strong>the</strong> resistance of <strong>the</strong> decade box <strong>to</strong> <strong>the</strong> maximum range. For example 200 O C = 175.86Ω. Check <strong>the</strong> calibration<br />
is with<strong>in</strong> +0.25% of read<strong>in</strong>g + 1LSD.<br />
Part No HA031260 Issue 1 May-12 87
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