Pair (2) Gold Plated Banana Plug, Low EMF / Low Resistance Test Leads 3 ft. 36"

Description

The item for sale is (2) 36 inch (90 cm) banana Male to banana Male patch cable/meter lead, one red, one black. The cable is ultra-low resistance: 0.001 Ohm (1 milliohm) per foot, with 24-karat gold-plated tellurium copper (low thermal EMF) banana connectors clamped (lower thermal EMF.) onto 10 AWG gauge microstrand tinned copper
c
o
n
d
u
c
t
o
r
, silicone-insulated cable for super flexibility and durability! Compare to Pomona patch cables at: 0.008 Ohm (8 milliohm) per foot.
The finger grips also provide strain relief. They are removable for use in ultra-tight spaces. But they should normally be used.
The item is shipped with the grips reversed to protect the gold plating on the terminals. Simply twist off and reverse them to use.
I have used many types of patch-cable/leads. Under most conditions all of them would work. But at sub-ppm levels, a whole new world opens. I couldn't find the perfect lead. So I designed  a lead that was what I needed a lead to do/be.
These cables are not for use with handheld, 3-1/2 digit multimeters, although it's not forbidden by law. They are used with precision voltage dividers
,
l
a
b
o
r
a
t
o
r
y
s
t
a
n
d
a
r
d
s
,
a
n
d
p
r
e
c
i
s
i
o
n
D
M
M
s
.
I had a Fluke 720A in for repair. It tested working perfectly, because I nulled it using the low emf / low-resistance leads in this description.
These leads are also useful for taking resistance measurements where 4-wire is not possible.
Other uses include: leads to use when measuring the internal resistance of devices with very low internal impedance, i.e. voltage standards: measuring the output, and again measuring it with a resistor across the output leads, and calculating, by the delta output voltage, the missing leg of the voltage divider thus formed, which is the internal resistance (impedance for AC). This figure is useful for calculating the expected output voltage at a given load.
The high thermal conductivity aluminum finger grips dissipate heat, to equalize temperature in the leads more quickly, thereby reducing the potential difference
, due to thermal EMF
, between the two leads, to zero. Thermal EMF in test setups can produce errors up to 10ppm.
If you have equipment to setup a stable voltage or resistance (resistance is derived by measuring a voltage drop), and you have measurement resolution of
10uV
or less,
hold one of the lead terminals--next to the meter--with your fingers. 1.0 uV resolution should  begin to shift after 5 or 10 sec. (or less).
Heat from your fingers produces a thermocouple effect, which is thermal EMF. Thermal EMF cancels out after the connections become the same temperature. That is, if you have 1.0uV EMF on both terminals, there is no potential difference (1=1), so EMF is null. Not only do adding zero produce no change to the reading, but zero is always zero. Meter accuracy
isn't
a factor with zero.
Low thermal EMF does provide some increased accuracy in the final readings. But the main advantages are 1). consistency in readings (more control over experimental conditions, lower uncertainty); 2). increased speed, because adequate thermal equilibrium occurs more quickly, EMF becomes null, and you can make valid measurements!
If you want the absolute best there is,
i
t
'
s
h
e
r
e
. I've been using these for years. They're custom made to our specifications. They cost more, because the buyer gets more. Thank you for viewing our eBay.com listing.
Questions, use the link above.