Keithley 2182, Руководство пользователя, Страница: 128 / 339

Reading hold (autosettle)
With hold enabled (HOLD annunciator on), the first processed reading becomes the “seed”
reading and operation loops back within the device action block. After the next reading is
processed, it is checked to see if it is within the selected hold window (0.01%, 0.1%, 1%, 10%)
of the “seed” reading. If the reading is within the window, operation again loops back within the
device action block. This looping continues until the specified number (2 to 100) of consecutive
readings are within the window. If one of the readings is not within the window, the instrument
acquires a new “seed” reading and the hold process continues.
When a hold reading is acquired, an audible beep is sounded (if enabled) and the reading is
considered a “true measurement.” The reading is held on the display until an “out of window”
reading occurs to restart the hold process.
For remote operation or when scanning, the hold process seeks a new “seed” once it has been
satisfied and the readings have been released. For basic front panel operation, the hold process
does not seek a new “seed” until the held condition is removed.
NOTE Hold can only be used with Channel 1. Whenever Hold is enabled, Channel 2
becomes inoperative.
Hold example
1. Press SHIFT and then HOLD to display the present window (0.01%, 0.1%, 1%, or 10%).
2. To change the window, press the or key to display the desired window.
3. Press ENTER. The present hold count is displayed (2 to 100).
4. To change the hold count, use the , , , and keys to display the desired count.
5. Press DCV1 to measure voltage on Channel 1.
6. Apply the test signal to Channel 1 of the Model 2182. Once the signal becomes stable
enough to satisfy the hold condition, the reading is released and the beeper sounds (if
enabled).
7. Remove the hold condition by disconnecting the signal from Channel 1. Hold will then
seek a new “seed.”
8. To disable HOLD, press SHIFT and then HOLD.
Beeper control
The beeper for Hold can be enabled or disabled from the ON/OFF LIMITS menu as follows:
1. Press ON/OFF to display the beeper selections (NEVER, OUTSIDE, and INSIDE).
2. Perform step A or B:
A.
To enable the beeper, use the or to key to display OUTSIDE or INSIDE.
B. To disable the beeper, use the or to key to display NEVER.
3. Press ENTER. The instrument returns to the normal display state. However, limit testing
is enabled.
4. If you wish to disable limit testing, press ON/OFF. Limit testing is covered in Section 8 .
7-6 Triggering