Doric Instruments 475 Series Portable Digital Calibrators - Manual

VAS Engineering 473/475
Doric
Series Portable Digital
Calibrators
Doric 473/475
Doric Model 473 and 475 Digital Temperature
Calibrators use custom VLSI integrated circuits
in a patented circuit design to deliver
exceptional accuracy, high reliability, and long
battery life in a truly portable, handheld
instrument. Large, touch-type switches and
precision adjustment control let you access
multiple functions quickly, and because you
can both simulate thermocouples or RTDs and
measure corresponding transmitter output with
one instrument, calibration is faster.
Other features that increase your productivity
include direct readings in both °C and °F,
without additional modules or conversion
tables. Independent, simultaneous zero and
span adjustment functions eliminate repetitive
readjustments of instruments being calibrated.
Rugged package design and complete fuse
protection insure reliable use, year in and
year out.
General Specifications
473 Series 475 Series
Inputs: Thermocouple: K, J, T, mV DC, mA DC, Ω RTD: Pt. .00385, Pt. .00392, Cu 10 Ω , Ω , mV DC, mA DC
Calibration Output: Thermocouple: K, J, T, mV DC, mA DC, Ω RTD: Pt. .00385, Pt. .00392, Cu 10 Ω , Ω , mV DC, mA DC
Input/Output Impedance: Input Impedance: Calibration Mode:
T/C and mV: 13M Ω Output impedance during set-up for calibration: 100M Ω between RTD
mA 11 Ω or 50 K Ω (selectable) terminals 1, 2, 3, and 4.
Output Impedance: Output impedance: during loop operation with an external instrument or
Less than 10 Ω up to 150nA transmitter, ohmic value between terminals 1 and 2 and between
terminals 3 and 4 is equal to the pre-set ohmic value of the HI or LO
potentiometer, from 1
Ω to 2K Ω . Terminals 1 and 4 and terminals 2
and 3 are connected in common.
Input Impedance: 10–20 Ω with mA input; 180K Ω with mV input.
Indication Mode:
Source Impedance: 21.5K
Ω , with a nominal excitation current flowing
from terminal 4 to terminal 3 of 172 µA for temperature ranges
(55µA for 0.1ohm range, 5.5µA for 1.0 ohm range).
Input Impedance: 15M Ω between terminals 1 and 2.
Temperature Stability: Zero: ± 2 µV/°C, Span: ±0.2% rdg/°C Zero: ± 2 µV/°C, Span: ±0.2% rdg/°C
Ref. Junction: ±1°C/°C
Stability with Time: 90 days add ±0.05% rdg. 90 days add ±0.05% rdg.
1 year add ±0.1% rdg. 1 year add ±0.1% rdg.
Noise Rejection: CMV: 1000VAC or VDC, 1500V peak CMV: 150VAC RMS; 200VDC
CMR: 140dB @ 50/60Hz, 0.1° range; 120dB @ CMR: 140dB @ 50/60Hz ±1Hz, 0.1° range; 120dB @ 50/60Hz ±1Hz,
50/60Hz, 1.0° range; 100ohms unbalance 1.0° range, 100ohms unbalance
NMR: 50dB @ 50/60Hz ±1Hz, 0.1° range; 35dB @
50/60 Hz±1Hz, 1.0° range
Isolation: Can be used with isolated or non-isolated instruments Can be used with isolated or non-isolated instruments. The RTD input/output
terminals are fully isolated from the mA /mV input terminals.
Weight: 1 lb. (454g) 1 lb. (454g)
Size (H x W x L) 2.75" x 3.75" x 8.3" (6.9 cm x 9.5 cm x 21.1 cm) 2.75" x 3.75" x 8.3" (6.9 cm x 9.5 cm x 21.1 cm)
Key Features
■ Measures and Simulates RTDs, Thermocouples, Ohms, Milliamps, and Millivolts
■ Calibrates Temperature Controllers, Indicators, Recorders, Transmitters
■ Long Battery Life
■ Lightweight, Handheld Versatility (carrying case included)
■ Hi/Lo Memory
■ Accuracy ±0.1%
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