HP 34970A manual Uj m, Copper-to

Chapter 8 Tutorial

System Cabling and Connections

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su v u ””uu” ts ”u °uqu°uxu°u”us
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tyy°y”q °uyvvuuu4 Nqsx °u°u
zy v q	”	2 xysx wu q ”
u zs uu tyvvusu4 i x”t u usuq
usq °yy°y u°s”u ”u qt uu
qyq y ””uu” ”u °uqu°uxu ru sus

v yw su3su sy°ut susxu ” °°xu°”usys ”qwu v susyuuu tyy°y”q °u

Copper-to-	Approx. mV / °C
Copper	<0.3
Gold	0.5
Silver	0.5
Brass	3
Beryllium Copper	5
Aluminum	5
Kovar or Alloy 42	40
Silicon	500
Copper-Oxide	1000
Cadmium-Tin Solder	0.2
Tin-Lead Solder	5
uj m		Sv q °q“y °uqu°u

yu”t2 x”t usq qyt ysy ”u y qu°uus” sqsut r

uyxu °u°u v xu y susy y yyt °qwuys vyu”t r q uys vyu”t4 I xyu”tut2 ” tut y

moving in the earth’s magnetic field can generate several millivolts. The varying magnetic field around the ac power line can also induce voltages up to several hundred millivolts. You should be especially careful when working near conductors carrying large currents.

Where possible, you should route cabling away from magnetic fields. Magnetic fields are commonly present around electric motors, generators, televisions, and computer monitors. Also make sure that your input wiring has proper strain relief and is tied down securely when operating near magnetic fields. Use twisted-pair connections to the instrument to reduce the noise pickup loop area, or dress the wires as close together as possible.

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