Operation
Operation Instructions 3
ADC | Thres: | 1.0 | ALC |
Start | pA | ||
Stop | Thres: | 0.9 | pA |
Current: | 0.0 | pA | |
Figure 3-11. The Test Function Screen Showing the Automatic Leakage Compensation Settings
Figure 3-12 displays the settings for the timer interval, count mode, and decimal places. Refer to Section 3.9.6 for details.
ADCALC
Interval: 60 s
Count: UP
Decimal Places: 0
Figure 3-12. The Test Function Screen Showing the Timer Settings
Figure 3-13 shows the display format setting for the effective exposure time, which determines the presentation of the effective time on the Measurement screen.
ADC | ALC |
Exp | Time: HR/MIN/SEC |
Figure 3-13. The Test Function Screen Showing the Effective Exposure Time Display Setting
To change the effective time format setting, press the TEST FUNCTION button to show the "f" cursor and use the UP and DOWN arrow buttons to select either seconds (SECONDS) or hours/minutes/seconds (HR/MIN/SEC). Press the TEST FUNCTION button again to hide the cursor and save the selection.
3.9.5Automatic Leakage Compensation
Automatic compensation for leakage currents can be enabled and disabled from the front panel. Automatic leakage compensation allows the instrument to “detect” when an exposure is in progress and hold the final exposure measurement values between exposures.
The start threshold specifies the current necessary for the instrument to begin updating the exposure measurements. The stop threshold must be smaller than the start threshold, and it indicates the minimum current required for the exposure measurements to be updated once an exposure is detected. That is, the instrument will cease updating the exposure measurements when the current drops below the stop threshold and will return to measuring leakage.
NOTE
The instrument uses the start and stop threshold settings to sense when an exposure is in progress.
