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35040
Operators Manual
B-4
Procedure
• The annunciator line on the Measurement screen displays "WAIT System Not RDY" while the
instrument is acquiring the minimum number of samples required for leakage compensation. Wait
for this message to disappear.
• Wait for the leakage current to return to the nominal value.
• Make the exposure.
When the instrument senses that the exposure is over, it displays and holds the exposure measurements
and then resets the electrometer (refer to Section B.4.3 for information on configuring the start and stop
thresholds). The exposure measurements are displayed until either the RESET/MEASURE button is held
for one second, the bias voltage or threshold changed, or another exposure is started.
B.3.2 Making Timed Exposure Measurements
The timer is available when any of the measurement displays contains a timed measurement. Refer to
Section B.7 for information on customizing measurement displays.
Timer Setup
Procedure
• Use the TEST FUNCTION button, along with the UP and DOWN arrows to display the Timer Setup
screen.
• To modify the timer setup, press the TEST FUNCTION button to display the "
" cursor at the timer
interval field and use the UP and DOWN arrows to select a timer interval from the programmed list.
(Refer to Section B.7 for information on how to program the interval list.)
• Press the TEST FUNCTION button to advance the "
" cursor to the timer count mode field and use
the UP and DOWN arrow keys to select up (UP) or down (DOWN) for the count mode.
• Press the TEST FUNCTION button to advance the "
" cursor to the timer decimal places field and
use the UP and DOWN arrow keys to select zero (0) or one (1).
• Press the TEST FUNCTION button to hide the cursor and save any changes. Proceed to using the
timer, which is discussed next.
Timer Use
Procedure
• Press the RESET/MEASURE button to show the Measurement screen if it is not displayed.
• To start or manually stop the timer, press the RESET/MEASURE button while the instrument is
updating other exposure measurements (e.g., charge and current). The instrument displays the
“Tmr” annunciator when the timer is running.
The instrument will not permit the timer to be
started while leakage is being measured.
• Upon completion of the timer interval or if the instrument senses the exposure is over (applicable
when automatic leakage compensation is enabled), the instrument ceases updating the timed
measurements.
Use the predicted timed charge or dose
measurement to diagnose a problem at the onset of
NOTE
NOTE