SUPPRESS
DESCRIPTION
The suppress feature serves as a means of baseline suppression allowing
a stored offset value to be subtracted from subsequent readings. When
the SUPPRESS button is pressed, the instrument triggers a conversion
and stores the reading as a baseline value. All subsequent readings
represent the differences between the applied signal level and the stored
baseline. The stored baseline can be as small as the resolution of the in-
strument will allow or as large as full range.
A suppress level can be established for any measurement function and is
effective only on that function. Changing functions, except between
amps and VII (see V/I operation), will cancel the suppress level already
established. Once a suppress level is established for a measurement
function, that stored level will be scaled according to what range the
Model 617 is on.
It is important to note that the suppress mode reduces the dynamic
range of measurement by that stored level. For example, assume that
the suppress level is + lfi end the w range is selected. The maximum
positive displayed reading, before overranging, would be +0.9999fi.
This is because the A/D converter would be seeing 1.9999fi (maxi-
mum) from the input. The dynamic range of measurement is
-1.9999fl to +0.9999@ (2.9998fi) as compared to the normal
-1.9999fi to + 1.9999fi (3.9998rN span. The dynamic range of
measurement has been reduced by lfi (10,060 counts). The effects of
dynamic range can reduced by selecting a higher range or using
autorange.
17
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