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•Calibration
general
All instruments are fully calibrated before leaving the factory and
should not need adjustment until the next scheduled calibration.
equipmentrequirements
• A suitable signal source (mA or V) for the inputs
• Two accurate digital multimeters (accurate to 0.05 mV and ±0.1 μA)
• A suitable regulated power supply, e.g., RPS/40 V AC/4 V DC/x
• Flat bladed screwdriver (blade width less than .54 mm/0.1 inch)
Digital multimeters are frequently better at measuring voltages than
currents, so you may wish to measure the voltage across an accurate
standard resistor (say 10 Ω ±0.05 %) when monitoring current signals.
If you have a Mann Industries Portacal 1000 calibrator you will not
need the second multimeter or the regulated power supply.
Terminalconnectionsforcalibration
ModelNumber
TWI-1/4-20 mA
7940010159
TWI-1/0-10 V
7940011660
Note: check all connection details against the instrument top label.
1
Cat.No.
Channel
One
One
Signal
DC milliamp source +
4-20 mA input
DC milliamp source −
mA output +
4-20 mA output
mA output −
DC Voltage source +
0-10 V input
DC Voltage source −
mA output +
4-20 mA output
mA output −
Signaltype
Terminal
1
3
4
6
1
3
4
6
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