Omega CA450 User Manual page 20

) Function switch
Use this switch to turn the power on and off and to select the measurement mode.
Function
OFF Turns the CA0 off.
AC voltage measurement and
V / Hz
frequency measurement
V DC voltage measurement
DC/AC voltage measurement
mV / mV
in mV
SENSOR
and various SENSOR modes
Resistance measurement
Ω /
Diode test
If test leads or lead cables are connected to the current measurement and
output terminals, you cannot turn the function switch to the OFF position.
2) SELECT key
By pressing this key, you can select different measurement modes when the function switch
is at the positions listed below.
You can switch out of the selected mode by pressing the key again.
mV/ mV position:
Ω position:
LOOP POWER position: The SELECT key turns the internal series resistor for HART
position:
) RANGE key
Use this key to select the measurement range.
Fixed range:
AUTO range:
) HOLD key
Use this key to hold the measured values.
Press HOLD to switch between data hold, auto hold, peak hold, and no hold (release).
(Hold modes that are not supported for the selected measurement function are skipped.)
Mode
AC voltage mV measurement
(AC SENSOR measurement in SENSOR mode)
Diode test
communication on and off.
Operation mode (
"Range Hold" appears on the display.
The range increases each time you press RANGE.
"AUTO" appears on the display.
To select A UTO range, hold down RANGE for  second or longer.
Function
OUT
PUT
LOOP POWER
/ and
8
Mode
Continuity check
DC current measurement
DC current output
Constant current output
DC current output
Current sweep output
DC current measurement
Loop power supply
/ ) switching