Table of Contents
Advertisement
Theory of Operation
Precision Voltage Source (Copper Output)
The general equation for the Model 1140A when it is used as a precision linear voltage source in
the copper mode is
where V
is the voltage produced at the terminals, V
OUTPUT
on the display, and V
OFFSET
menu.
Thermocouple Meter (Alloy Input)
The general equation for the Model 1140A when it is used to measure temperature using a
thermocouple as its input is
where T
is the measured temperature shown on the display, T
METER
temperature of an ideal thermocouple connected to the terminals, T
offset set in the THERMOCOUPLE → THERMOCOUPLE OFFSET menu, and T
offset temperature (if autozero is enabled).
Precision Voltmeter (Copper Input)
The general equation for the Model 1140A when it is used as a precision voltmeter is
where V
is the measured voltage shown on the display, V
METER
the terminals, V
OFFSET
menu, and V
is the autozero offset voltage (if autozero is enabled).
AZ
Thermocouple Simulator (Copper Output)
The general equation for the Model 1140A when it is used as a precision thermocouple voltage
source in the copper mode is
where V
is the voltage produced at the output terminals, T
OUTPUT
temperature of the simulated thermocouple, T
junction set in the THERMOCOUPLE → REF JCT TEMP menu, and T
set in the THERMOCOUPLE → THERMOCOUPLE OFFSET menu.
Thermocouple Meter (Copper Input)
The general equation for the Model 1140A when it is used to measure emf's in terms of
temperature in the copper mode is
where T
is the measured temperature shown on the display, T
METER
temperature of an ideal thermocouple connected to the terminals, T
V
OUTPUT
is the offset voltage set in the OUTPUT → COPPER VOLTAGE OFFSET
T
= T
METER
V
= V
METER
is the offset voltage set in the OUTPUT → COPPER VOLTAGE OFFSET
V
= f
(T
OUTPUT
cn
SIMULATED
T
= T
METER
INPUT
+ V
= V
,
SOURCE
OFFSET
is the user-specified voltage shown
SOURCE
− T
− T
,
INPUT
OFFSET
AZ
− V
− V
,
INPUT
OFFSET
AZ
INPUT
) − f
) + f
(T
cn
REFJCN
cn
SIMULATED
is the temperature of the simulated reference
REFJCN
+ T
+ T
+ T
REFJCN
AZ
OFFSET
7-2
is the theoretical
INPUT
is the thermocouple
OFFSET
is the autozero
AZ
is the input voltage applied at
(T
),
OFFSET
is the equivalent
is the offset temperature
OFFSET
,
is the theoretical
INPUT
is the temperature of the
REFJCN
Advertisement
Table of Contents
