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A-300B Electrostatic Locator |
Measures static charges instantly, reliably, economically!
- Measures static charge from zero to 30000 volts
- Convenient pocket size
- Designed for close-in repetitive readings
- Uses standard 9 volts battery
- Battery Test Feature
- Low drift
- Repeatability +/- 1%, accuracy +/- 10%
- One-year warranty on parts and labor
Reliable on-the-spot measurement of static charges has never been
easier than with the portable Model A-300B. Hand-held, yet highly
accurate, the A-300B answers three basic questions: 1) Is static present
and on what surfaces, materials or people? 2) How much static? 3) What
is the polarity of the charge? The instrument is ideal for use on such
static sensitive environments as electronic component production and
assembly areas, clean rooms, computer, medical and R&D laboratories,
surgical rooms, medical device manufacturers, printing presses,
packaging and production lines, etc. No auxiliary attenuators or heads
are required; the A-300B is completely self contained. To minimize error
from extraneous state fields, the unit utilizes a recessed nicked-plated
sensing electrode, which operates on a high/low circuit. The low range
measures 0-500 volts at 0.5" to the surface being measured and
0-3000 volts at 4". The high range measures 0-5000 volts at a
distance of 0.5" and 0-30000 volts at 4". For repetitive
measurement, the A-300B features a unique "quick zero"
function which instantly re-zeroes the instrument and provides ground
compensation for the user.
| Weight |
5.5 oz. (with battery) |
| Size |
4-3/8" x 2-2/8" x 1-5/16" |
| Repeatability |
± 1% |
| Accuracy |
±10% |
Note: Accuracy is dependent on three factors:
- The instrument must be properly zeroed;
- The distance from the surface of the sensitive electrode to
the target or surface under examination must be accurately defined;
- The target must be large relative to he sensitive electrode.
For total accuracy, the target be tested must be 2" x
2" or larger at he 1" range. At the 4" read range, the
target must be a minimum of 16" x 16". Smaller target will
result in inaccurate readings.
- The instrument is ON when the RED Power/Range selector switch
is in LO or HI position. Static charges may be interpreted as follows:
|
RED
Switch Position
|
Distance from face
of electrode to target |
Static Meter
voltage range |
| LO |
1/2" |
0-500 V |
| LO |
4" |
0-3000 V |
| HI |
1/2" |
0-5000 V |
| HI |
4" |
0-30000 V |
LO range is read directly from meter. HI range is 10 times meter
reading. If general magnitude of charge is unknown, start in LO Range.
- Discharge you body by touching a grounded metal object, e.g.,
water pipe, metal electrical conduit, grounded machinery or workbench.
- Face the instrument away from charged object, press the black
ZERO switch twice, then release. Switch will return to READ position.
The instrument may also be zeroed by pointing it toward a known
grounded surface and pressing the ZERO switch twice.
- Point electrode toward target and move to a separation of
either 4" or 1". Note reading on appropriate meter scale.
- Repeat 1 through 4 for additional measurements.
- Return RED switch to mid-position to turn instrument OFF when
not in use.
The unit uses a 9V transistor battery. Replace battery on low
indication in battery test. Replace battery when storing instrument for
an extended period of time.
If excessive drift is noted, the surface of the electrode may
require cleaning. Wipe the surface of the electrode with a soft cloth
saturated with clean alcohol and allow to dry thoroughly. Dust off any
lint. |
