Altek a 830-KP - Manual (Page 8)

13
CONTROLLER
(TYPICAL)
ADDITIONAL
4-20 mA OR 1-5V
INSTRUMENTS
RECORDER
COMPUTER
LOGGER
ETC,
1-5V DC
250 Ω
Typical
2-Wire
Transmitter
+IN-
REF
+OUT
-
CHECK 1-5 VOLT INPUTS
WITHOUT DISCONNECTING WIRES
OPERATING INSTRUCTIONS
12
CHECK 1-5 VOLT INPUTS
WITHOUT DISCONNECTING WIRES
Most 1-5 Volt receivers in 4-20mA loops have a 250 Ohm
resistor across the input of the receiver. This resistor may be
mounted internally or externally. TechChek 830-KP is connected
directly across the input of the 1-5 Volt receiver without
disconnecting any field wiring. This saves a great deal of time
when a large number of voltage receivers, such as chart recorders
or computer systems, require calibration.
Make certain that changing the signal input will not disturb the
process or cause unexpected alarms when checking on-line
instruments. It is important to remember the 830-KP drives only
the device to which it is connected. It has no effect on other
devices in the 4 to 20 mA loop. TechChek 830-KP will clamp the
selected value in the mV and V Ranges to the maximum source
or sink current of >16 mA.
1) Press the MILLIAMP/V push-button until V or mV appear on
the display
2) Press the DISPLAY/SOURCE/READ push-button until SOURCE
and V or mV appear on the display
3) Press the TYPE/ENG UNITS push-button once to switch
between V and mV on the display
4) Connect the red SOURCE lead of the calibrator to the plus (+)
input of the device and the black SOURCE lead to the minus (-).
Any associated 250 Ohm resistor must not be disconnected.
OPERATING INSTRUCTIONS