Monroe-electronics Electrostatic Voltmeter - Isoprobe® - model 244A Instrukcja Użytkownika Pobierz pdf (Strona 14)

c. While closing the switch, observe the instrument output and adjust

GAIN for fastest speed-of-response with minimum overshoot in

step response.

Once properly adjusted, the GAIN control should require no

further attention unless the probe-to-surface spacing is altered.

The static follow-up error (difference in DC potential between the

unknown and the probe) of a carefully zeroed and adjusted

instrument is typically less than 0.05% throughout its range.

d. With the probe aperture viewing a zero volt (or grounded) surface,

set ZERO control at mid-range. Adjust BAL (balance) control for

near zero reading.

B. SPACING INSENSITIVITY OVER LARGE PROBE-TO-SURFACE SPACING

RANGE:

This adjustment procedure will minimize offset errors due to variations in probe-

to-surface spacing. This adjustment is preferably done with a mechanical

positioning device and a grounded plate.

1. Position probe for minimum probe-to-surface spacing.

2. Adjust for a meter reading of zero, as described in Sect. A3d above.

3. Re-position to maximum probe-to-surface spacing and adjust BAL

control for a meter reading of zero.

4. Return to the minimum spacing and re-adjust ZERO. Repeat this

procedure until the degree of spacing insensitivity desired is reached.

The stability of this adjustment is directly related to zero drift and the

probe-to-surface spacing.

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Monroe-electronics Electrostatic Voltmeter - Isoprobe® - model 244A Instrukcja Użytkownika Strona 14