In More Detail - Fluke 2620A User Manual

2620A, 2625A
Users Manual
1. Connect the shield to L (low) at the 2620A-100 Input Module, and try connecting the
2. Connect the shield to L (low) at the Input Module, and try connecting the shield to

In More Detail

If a low noise configuration is required, adhering to the following two rules minimizes
measurement errors and noise when using shielded sensors and wiring:
1. Connect the shield so that it and the L (low) terminal are at the same or very nearly
2. Connect the shield so that common-mode voltages will not cause current to flow
One key to applying these rules is to note that very high, but finite impedances exist
between H (high) and L (low), between H and earth ground, and between L and earth
ground inside the instrument.
5-12
sensor shield to a quiet earth ground at or very near the measurement sensor end
(and at only one place), or
earth ground (only) as close to the rear of the instrument as possible. Isolated and
shielded sensors will likely result in the best instrument measurement performance
possible in a noisy environment.
the same voltage, and
through the L (or H) source resistance(s).