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Operating Manual
Auto-Zero Function
The model 140 amplifier incorporates a unique Auto-Zero feature. The Auto-Zero can be actuated by two
methods.
1. Manually pushing the recessed Auto-Zero button on the top cover for a minimum of two seconds.
2. Remotely grounding the connection to Pin 5 of the Instrumentation output connector for a period
of two seconds minimum. To avoid inadvertent zeroing, the connection to pin 5 needs to be
isolated from grounding or extraneous voltage signals.
Multiple actuations may be required for the output to pull within the limit of ±1.5 mV. The amplifier can
auto-zero outputs within a range of ±500 mV. Note that the auto-zero correction factor is permanently
retained until its next actuation (ie. auto-zero can not be disabled).
If the gain setting on the amplifier is changed at any time or the transducer is replaced, the Auto-
Zero procedure needs to be re-actuated.
Measurement Specialties, Inc.
32 Journey, Suite 150, Aliso Viejo, CA 92656 USA
www.meas-spec.com
9 of 9
TM
+1 949-716-5377
t&m@meas-spec.com
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