Trek 156A, Руководство оператора

Страница: 15 / 42

Incoming Confidence Test
The 156A undergoes extensive checks and adjustments at the factory, and no initial
calibration should be required. However, you may wish to perform an incoming
confidence test as part of the incoming inspection on the instrument. An incoming
confidence test of this nature is intended to confirm that the instrument was not
damaged in transit.
We recommend that you familiarize yourself with the information in Section II and
Section III before performing this test.
Placing a charged object near the ion collecting plate while the instrument is in the
DECAY mode and measuring the decay time of the object would constitute a
reasonable incoming confidence test. A simple source for a charged object is an
ordinary pocket comb or a hard plastic screw driver. A pocket comb drawn through
the hair will usually produce a negative charge on the comb. A hard plastic handle of
a screw driver brushed against a pant leg will usually produce a positive charge on
the handle of the screw driver.
Warning:
Do not turn on the 156A until instructed to do so. To do so before the
appropriate point in time could result in an electrical shock and/or damage to the
instrument.
1. Ensure the power is OFF.
2. Connect the ion collecting plate to the ION COLLECTING PLATE connector on
the rear panel.
3. Connect the GROUND jack to earth ground using the banana-alligator cable
provided.
4. Place the MODE switch in the +DECAY position.
5. Turn on the power.
6. Momentarily press down on the TEST/RESET switch.
7. Move a negatively charged object (pocket comb) towards the ion collecting plate
until the value indicated on the PLATE VOLTAGE display decreases below the
programmed decay start voltage.
The decay timer will start when the plate voltage passes the programmed decay start
voltage.
Note:
The decay start voltage is factory programmed for 1000 V. (See
‘Programming the START voltage’ on page III-4 for information on changing the
I - 3
Introduction
直到指示这样做的156A不要打开。这样做的时间的适当位置，可能会导致电击和/或损坏仪器之前。