Manual Fluke 8588A (page 130 of 134) (English)

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8588A/8558A

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126

Table 25. Guidelines to Avoid Errors (cont.)

Sources of Inaccuracy Avoiding or Minimizing Inaccuracy

EM Interference - Noisy or intense electric,

magnetic and electromagnetic effects in the

vicinity can disturb the measurement circuit.

Some typical sources are:

• Static electric fields

• Fluorescent lighting

• Inadequate shielding, filtering or grounding of

power lines

• Transients from local switching

• Induction and radiation fields of local E-M

transmitters.

• Excessive common mode voltages between

the source and load.

These disturbances can be magnified by the

capacitance of your hand. Electrical interference

has the greatest effect in high-impedance circuits.

Separation of leads and creation of loops in the

circuit can intensify the disturbances.

Choose as interference-free a site as possible (a

screened cage may be necessary if interference

is heavy or circuit impedance is high). Suppress

as many sources as possible.

• Always keep interconnecting leads as short

as possible, especially unshielded lengths.

• Run leads together as twisted pairs in a

common shield to reduce loop pick-up area,

but beware of leakage problems and

excessive capacitance.

• Where both source and load are floating,

connect LO to ground at the source to

reduce common mode voltages.

• If an external measurement ground

connection has been made, select External

Guarding at the Product in Voltage and

Current functions and deselect External

Guarding in Ohms and PRT functions.

• When connecting to a multifunction calibrator

such as the Fluke 5730A or 5522A, follow

the Product guarding and grounding advice

and deselect External Guard at the Product.

Test Lead Resistance can drop significant

voltages between the source and load, especially

at high load currents.

Keep all leads as short as possible.

• Use conductors with a good margin of

current-carrying capacity.

• Use External Guard or 4-wire connections

where necessary.

Lead Insulation Leakage can cause significant

errors in measurement circuits at high voltages

and high resistances.

Some insulating materials suffer greater losses

than others, for example. PVC has more leakage

than PTFE.

Choose low loss insulated leads - PTFE is

preferred to PVC. When running leads together in

shielded pairs, avoid large voltages between

leads in the same screen, especially if using PVC

insulation.

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Fluke 8588A Manual

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