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• Buffer operations — Explains how to store and recall readings including buffer

statistics (minimum, maximum, peak-to-peak, average, and standard deviation).

• SCPI programming — Covers the SCPI commands used to control buffer operations.

Buffer operations

The Model 2182 has a buffer to store from two to 1024 readings and units. It also stores the

channel number for step/scan readings and overﬂow readings. In addition, recalled data includes

statistical information (minimum, maximum, peak-to-peak, average, and standard deviation).

NOTE Statistics are not calculated when an overﬂow reading has been stored in the buffer.

The buffer ﬁlls with the speciﬁed number of readings and stops. Readings are placed in the

buffer after any math operations are performed. Math operations include Relative, Ratio or

Delta, and mX+b or Percent.

Buffered data is overwritten each time the storage operation is selected. The data is volatile;

it is not saved through a power cycle.

NOTE Measurements performed during stepping or scanning are automatically stored in the

buffer. There is no need to conﬁgure and enable the buffer. Stepping and scanning is

covered in Section 9.

NOTE When changing the interface (GPIB to RS-232, or vice versa), all data in the buffer clears.

Store

Perform the following steps to store readings:

1. Set up the instrument for the desired conﬁguration.

2. Press the STORE key.

3. Use the cursor keys ( and ), and the RANGE  and  keys to set the number of

readings to store (2 to 1024).

4. Press ENTER to enable the buffer. If in the immediate trigger mode, the storage process

will start immediately. If in the external trigger mode, each input trigger (or press of

TRIG key) will store a reading.

NOTE The asterisk (*) annunciator turns on to indicate that the data storage operation is

enabled. It will turn off when the storage process is ﬁnished (buffer full).

6-2 Buffer

Keithley 2182 User Manual

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