Daytronic 10A78 Bedienungsanleitung

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1GENERALDESCRIPTIONANDSPECIFICATIONS

The Model 10A78 is a single-channel conditioner of phase-sensitive carrier-amplifier

design (rather than a two-channel, fully DC instrument). Intended for applications

involving transformer-coupling to the transducer bridge (as with rotary-transformer

torque sensors), this conditioner can also be used in conventional installations when

high sensitivity is required or where the electrical environment is especially noisy.

Responding only to the modulated carrier frequency, the 10A78 rejects extraneous

voltages that can cause errors in DC systems, particularly when there is a need to

“blow up” a portion of the transducer range. User-adjustable phase and symmetry

controls are provided.

The Model 10A78's data channel is best calibrated by means of a “two-point (dead-

weight)” or shunt-calibration technique, following an initial “calculated” calibration. The

supplied calibration resistor is 59 kilohms, 1%. Note that the 10A78 can NOT be cali-

brated via the System 10

MV/V CALIBRATION(MVV)command. Note also that a

specially modified version of the 10A78 is required if you wish to control the shunt-cali-

bration process by means of logic-level inputs through the rear I/O CONNECTOR.

ADDITIONAL10A78 SPECIFICATIONS

Transducer Types

: Conventional 4-arm strain gage bridges, nominal 350 ohms (or

higher)

Input Ranges (Full-Scale): ±0.75, 1.50, or 3.00 mV/V; automatically selected—on an

individual channel basis—when the channel is configured; for the System 10 channel

“type” code assigned to a 10A78 data channel, see Table 1, below. Since channel

zeroing is by digital techniques, no input balance control is provided. The allowable

input range, therefore, must include any

initial unbalance(which, in commercially

produced strain gage transducers, is usually negligible). Other transducers may

have to be externally trimmed to be used with the Model 10A78, if zero unbalance

exceeds 20% of full scale.

Excitation: Regulated 3 V-AC (rms) at 3280 Hz; 50 mA (rms), maximum

Amplifier:

Common-Mode Range: ±1 V operating; ±9 V without instrument damage

Common-Mode Rejection Ratio: DC and at 60 Hz: infinite; at 3 kHz: -60 dB

Input Impedance (Differential and Common-Mode): 10 MΩ

Offset: Initial: ±3% of full scale; vs. Temperature: ±0.005% f.s./°C; vs. Time: ±0.02%

f.s./month

Gain Accuracy*: ±0.02% of full scale typical, following calibration

(cont’d)

MODEL10A78

ACSTRAINGAGE

CONDITIONERCARD

GENERALDESCRIPTIONANDSPECIFICATIONS10A78.1

*Initial (uncalibrated) inaccuracy may be as great as ±3% of full scale. Maximum error that

could occur upon replacement of a Model 10A78 not followed by calibrationis ±6% of full

scale.

1.E.2.10A78

SYSTEM10

ANALOGINPUTCARDS

Produktspezifikationen