Wavelength Electronics LFI-3751, User Manual

Page: 73 / 132

73
3
Analog Input BNC
Input a 0 to
±
10 V analog signal to adjust the setpoint remotely. The sum
of the front panel SET T setting and analog input determine the control
temperature. If not using the analog input, install the 50
Ω
BNC terminator
provided with the unit to minimize electrical noise and protect against
electro-static discharge. The transfer functions change according to the
sensor type and bias current.
Thermistors & RTDs (10
µ
A or 100
µ
A)
Thermistors & RTDs (1 mA or 10 mA)
LM335/35, AD590, Thermocouples
10 k
Ω
/ V
100
Ω
/ V
10°C / V
Analog Input Transfer Functions
Analog Input BNC
BNC Connector [Used with Analog Version only]
Chapter 3 - Rear Panel Operation
BNC Connector
•
Example: With a thermistor biased with 100
µ
A, if SET R is 12 k
Ω
, if you
input +0.2 V at the Analog Input BNC , the setpoint becomes:
12 k
Ω
+ (0.2 V) (10 k
Ω
/ V
)
= 14 k
Ω
•
RS-232 Command: [MOD Gain Confi guration]