DayTronic System 10 - Model 10 A68-2 Dual AC RMS Conditioner Card; 1 General Description and Specifications

1 GENERAL DESCRIPTION AND SPECIFICATIONS
Using the special screw-terminal connector board described in Section 2, the Model
10A68-2 accurately measures the true RMS amplitude of one or two independent
external analog AC signals, mixed as desired, from a wide range of voltage or cur-
rent sources
—including engineering parameters conditioned by other Daytronic
cards.
Since the 10A68-2 does not provide excitation, the analog source must supply its own
power supply
, if required (as is the case with many accelerometers, when used to
measure the noise level or vibration factor of a dynamic process). The card is particu-
larly useful in evaluating the
efficiency of AC electrical power systems.
ADDITIONAL 10A68-2 SPECIFICATIONS
Transducer Types
: AC signal sources (voltage or current)
Input Voltage and Current Ranges: See Table 1, below, for allowable full-scale input
ranges (given for each range are the corresponding
normal-mode input impedance
(z
i
), maximum normal-mode input voltage or current with no instrument damage
(V
max
or I
max
), and bandwidth flat to 0.1%, 1%, and 3 dB, respectively); automatically
selected—on an individual channel basis—when the channel is configured; for the
System 10 channel “type” codes assigned to 10A68-2 data channels, see Table 2,
below
Amplifier (per channel): Floating, with RMS Converter (see Table 1 for bandwidths)
Common-Mode Range: ±1500 V operating and without instrument damage
Common-Mode Rejection Ratio: DC and at 60 Hz: infinite; at 1 kHz: -60 dB
Input Impedance (Common-Mode): Essentially infinite for all input ranges
Offset: Initial: ±0.04% of full scale; vs. Temperature: ±20 ppm/°C; vs. Time: ±20
ppm/month
Gain Accuracy: ±0.05% of full scale typical, following calibration*
Gain Stability (all ranges except 5 A): vs. Temperature: ±50 ppm/°C; vs. Time: ±20
ppm/month
Gain Stability (5-A range only): vs. Temperature: ±500 ppm/°C; vs. Time: ±20
ppm/month
(cont'd)
* Initial (uncalibrated) inaccuracy may be as great as ±0.1% of full scale for all input ranges
except 5 A, for which it may be as great as ±0.5%. Maximum error that could occur upon
replacement of a Model 10A68-2 not followed by calibration is ±0.2% of full scale (±1% for 5-A
range).
MODEL 10A68-2
DUAL AC RMS
C
ONDITIONER CARD
GENERAL DESCRIPTION AND SPECIFICATIONS 10A68-2.1
SYSTEM 10
ANALOG INPUT CARDS
1.E.2.10A68-2