DayTronic 3000 series, Instruction Manual

Page: 8 / 30

Daytronic Corporation
INSTRUCTION MANUAL
MODEL 3178 STRAIN GAGE CONDITIONER
1. DESCRIPTION
The Model 3178 is a conditioner-amplifier for use with resistance strain gage
transducers in applications which require an ac excitation voltage. It supplies a 3.28
kHz precision amplitude-regulated excitation, remotely sensed, to the transducer.
The instrument uses a phase-sensitive carrier amplifier-demodulator design so that
both direction and magnitude of the applied force are determined. The 3178 con-
tains the necessary balancing and calibration controls and conditions/amplifies the
applied input to a standard Five-Volt Data Signal Level which is the output analog
signal level of
3000 Series
Instruments. Two analog outputs, having low-pass cutoff
frequencies of 2 Hz and 400 Hz, are provided. The filtered outputs provide for
averaging or smoothing of signals containing noise or other unwanted dynamic
components which are periodic in nature. Filtering removes these dynamic compo-
nents so that stable digital indication and precise
jitter-free
control action can be
obtained. The Model 3178 is shown in Figure 1 and the specifications are given in
Table 1.
Figure 1. Model 3178 Strain Gage Conditioner
1