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IEEE-488 PRQGRAMMlNG
4.9.6 Zero Check, Zero Correct (Z)
Puruose
Use Zero Check as a standby mode whenever making changes to the measurement
setup. Use Zero Correct when in the current function to cancel any internal offsets
that might affect instrument accuracy. Zero Correct is most effective when taken on
the 2OpA range.
Format
Default
Reference
Example
Zn
n = 0 Zero Check off.
n = 1 Zero Check on.
n = 2
Zero Check on and Zero Corrected.
Zero Check (Zl) should be used whenever making changes to the measurement setup.
This command places the instrument in a standby condition in which measurements
cannot be made.
Zero Check and CoITect (22) are used to cancel internal offsets when the instrument
is in the current~function. When 22 is sent, the reading will zero (the Model 595
will subtract the offset from all subsequent readings). The correction value will be
stored in permanent memory and reapplied upon power ups. The 22 command can
be sent with the Zero Check on or off. Use the following procedure to zero the CUP
rent function:
1. Select the current function and the 2OpA range.
2. Turn on Zero Check (Zl) and observe the offset; Correct the offset by sending
the 22 command over the bus.
3.
Disable Zero Check by sending q. Readings can then be taken in the usual manner.
Upon power up or after a DCL or SDC command is received, Zero Check (Zl) will
be on.
The equivalent front panel con*1
for the Z command is the ZERO CHECK
(COR-
RECT) button. See paragraph 3.3.5 for complete information on Zero Check.
From the front panel, select the 2OpA current range and turn off Zero Check. Enter
the following statements to zero the instrument:
After END LINE is pressed the second time, Zero Check will turn on end zero the
instrument. The third statement returns the instrument to normal operation.
NOTE: Only the current function should be zeroed.
4-20
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