Monroe-electronics Electrostatic Voltmeter - Isoprobe® - model 279L Instrukcja Użytkownika Pobierz pdf (Strona 8)

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SECTION 3

CONTROLS AND INDICATORS

FRONT PANEL - Figure 3-1

A. STBY/OPER Switch:

This push-push switch controls the operating condition of the unit. So long as power is applied, the following is true:

STANDBY  Starts the probe oscillating but leaves the high voltage disabled.

OPERATE  Activates high voltage only if the probe is plugged in and the tuning fork is oscillating.

B. Display:

The 4½-digit LED display is normally illuminated when power is applied to the unit and acts in a secondary capacity

as a power indicator.

A minus (-) sign at the left side of the display indicates that a negative voltage is being measured and is displayed

approximately 50% of the time (a polarity indecision) when the instrument is properly zeroed while measuring an

input signal of zero. No sign is displayed for a positive input.

The display may be turned off for darkroom use by actuating the push-push display switch through the access hole

in the panel with a suitable tool such as the point of a pen.

C. ZERO 1:

Balances internal probe contact potential to obtain probe to surface spacing insensitivity. This adjustment

procedure is described in Section 4A. ZERO 1 may also be used for large zero offset when spacing insensitivity is

not needed.

D. GAIN:

Closed loop system gain varies with probe to surface spacing. Excessive gain at close spacing causes instability

and insufficient gain at large spacing produces sluggish response and static error.

E. ZERO 2:

Compensates for unwanted system offsets over a range of approximately ±4 volts and does not affect probe to

surface spacing insensitivity. Adjustment procedure is outlined in Section 4. Once set, this operator accessible

adjustment usually does not require further attention except in critical applications.

F. Probe receptacle:

Mates with Model 1034 series probes manufactured by Monroe Electronics. An appropriate and functional probe

must be connected for the instrument to operate.

To connect the probe to the instrument, hold the plug (on probe cable) so that the two arrows are on top. Align with

the receptacle and push straight in until a “click” is heard.

To disconnect, hold the part with the two arrows and pull straight out. This will release the locking device.

Do not connect or disconnect the probe with power applied.

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Monroe-electronics Electrostatic Voltmeter - Isoprobe® - model 279L Instrukcja Użytkownika Strona 8