Ashcroft ATE-2 - Handheld Calibrator - Manual (Page 24)

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SECTION 14 j. WIRING DIAGRAMS
+
–
+
–
24Vdc Out 0-33Vdc In 0-22mA In COM
24Vdc Out 0-33Vdc In 0-22mA In COM
24Vdc Out 0-33Vdc In 0-22mA In COM
RESISTOR*
EXTERNAL
24 VOLT DC
SWITCH HOOKUP
USING INTERNAL
SUPPLY SWITCH
NORMALLY OPEN
SWITCH HOOKUP
USING INTERNAL
SUPPLY SWITCH
NORMALLY OPEN
EXTERNAL
24 VDC SUPPLY
Note that you can use a normally closed switch as well
*Resistor should be sized to allow current as follows:
2 mA < I < 36 mA, 2 mA Ȃ 12 k ⏲, 35 mA Ȃ 686 ⏲
SWITCH HOOKUP
USING INTERNAL
SUPPLY SWITCH
NORMALLY OPEN
4/20 TRANSMITTER HOOK UP USING, INTERNAL SUPPLY
4/20 TRANSMITTER HOOK UP USING, EXTERNAL SUPPLY
4/20
TRANSMITTER
24 Vdc
EXTERNAL
SUPPLY
+ –
4/20ma
TRANSMITTER
+ –
+
–
+24V ma Comm Vdc
+24V ma Comm Vdc
V OUT TRANSDUCER HOOK UP USING, INTERNAL SUPPLY
V OUT TRANSDUCER HOOK UP USING, EXTERNAL SUPPLY
V OUT
TRANSDUCER
24 Vdc
EXTERNAL
SUPPLY
+ –
V OUT
TRANSDUCER
–
+
–
+24V ma Comm Vdc
+24 ma Comm Vdc
̈
̈
+
SECTION 14 i. mA/V FUNCTION The HHC has the capability to monitor either DC milliamp current
0-22 mA or DC voltage 0-33 Vdc. Use of this feature requires
connection to the voltage or current source via the 4mm “Banana
Jacks” located above the units LCD. Note that this calibrator can
monitor only one parameter, either voltage or current, at a time.
To monitor voltage connect the negative lead of the voltage
source to the socket labeled “COM” with a black ring surrounding
the socket. Connect the positive lead of the voltage source to the
red ringed terminal labeled “0-33Vdc In”.
To monitor current connect the negative lead to the black ringed
terminal labeled “COM. Connect the positive current source to
the red ringed terminal labeled “0-22mA In”.
Devices under test may be powered by an external power source,
or by the 24 Vdc power supply built into standard (non-intrinsically
safe) HHC base units. See wiring diagrams in section 14j.
Press the mA/V key to activate voltage and current monitoring.
Press again to rotate through Volts, mA and pressure only
measurement.