8
5.
MODEL DC80L
The DC80L is the calibrator model for measuring and simulating V, mV and mA
signals. The DC80L is capable of measuring and generating 0 to 24 mA DC
current signals and voltages up to 15 V DC. Simultaneous measurement and
signal simulation is not provided.
Current measurements options are:
-
With use of external power supply provided by the system. In this case, the
calibrator is placed in series to measure the loop current (signal of a 2-wire
transmitter, for example).
-
The calibrator provides the power to the loop. This option makes use of the
DC80L built-in power supply. This configuration applies to measurements of
standalone 4-20 mA transmitters (sink type transmitters).
Current simulation possibilities are:
-
The calibrator sources the current to the target instrument.
-
The calibrator simulates (behaves as) a 2-wire transmitter.
The following tables show the DC80L specifications functions and ranges, based
on a one year calibration period, at ambient temperatures ranging from +18 °C to
+28 °C. “Counts” means units of the least significant digit.
Voltage measurement and simulation:
Function
Range
Resolution
Accuracy ± (% of r
Counts)
DC V / mV INPUT
Auto range
0 ~ 110 mV
0.01 mV
± (0.05 % + 5 counts)
0 ~ 15 V
0.001 V
± (0.05 % + 5 counts)
DC V / mV
OUTPUT
0 ~ 100 mV
0.01 mV
± (0.05 % + 5 counts)
0 ~ 15 V
0.001 V
± (0.05 % + 5 counts)
Input impedance: 2 M Ω (nominal) < 100 pF
Over voltage protection: 30 V
Voltage driver capability: 1 mA
DC mA measurement and simulation
Range
Resolution
Accuracy @ 25 °C
± (% of r Counts)
0 ~ 24 mA
(Input and Output)
0.001 mA
± 0.03 % + 5
Overload protection: 125 mA, 250 V fast acting fuse
Percent display: 0 % = 4 mA, 100 % = 20 mA
Source mode: compliance 1000 Ω at 20 mA for battery voltage ≥ 6.8 V ( 700 Ω
at 20 mA for battery voltage 5.8 to 6.8 V )
Simulate mode: External loop voltage requirement: 24 V nominal, 30 Vmax, 12 Vmin
Loop Power
Internal power supply
24 V ± 10 % / 25 mA max.