Option Installation; Sensor Installation; Sensor Input Terminals; Model 340 Rear Panel With Model 3464 Option Card Installed - Lakeshore 340 User Manual

10.4.2 Option Installation

The Model 340 instrument supports only one option board at a time. To install the 3464 Option into a
Model 340 follow the installation procedure in Paragraph 10.3.1.
To verify if an option is installed simply view the Model 340 rear panel. Options mount above the normal
inputs marked A and B. To identify an option installed in a Model 340, press Options, then press More three
times. Option identification displays on the REVISION INFORMATION screen.
If options board are changed, the Model 340 changes all parameter settings to default, but erases no sensor
curves entered for optional sensor types.

10.4.3 Sensor Installation

Sensor connection is important when using thermocouples because the measured signal is small. Many
measurement errors can be avoided with proper sensor installation.
CAUTION: Do not leave inputs unconnected to float. Short channels when not in use.
Figure 10-9. Model 340 Rear Panel with Model 3464 Option Card Installed

10.4.3.1 Sensor Input Terminals

Attach sensor leads to the screws on the off-white ceramic terminal blocks on the 3464. There is one block for
the C input and one for the D input. Each block has two screw terminals; one positive (+), one negative (–).
Chromel-AuFe0.07%
Chromel-AuFe0.03%
E (Nickel-Chromium vs. Copper-Nickel)
K (Nickel-Chromium vs. Nickel-Aluminum)
T (Copper vs. Copper-Nickel)
Secure the positive TC wire under the screw in the (+) terminal and the negative TC wire under the screw in
the (–) terminal. Tighten the screws on the thermocouple wires and remove all insulation.
Keep the ceramic terminal blocks away from heat sources including sunlight and shield them from fans or
room drafts.
10-8
Lake Shore Model 340 Temperature Controller User's Manual
OFF ON
120
!
WARNING
NO USER SERVICEABLE PARTS INSIDE. REFER
SERVICING TO TRAINED SERVICE PERSONNEL.
LINE -10% +5% 100 / 120 220 / 240
FUSE IEEE-488 INTERFACE
50-60 Hz 2.0 A 1.0 A
DATA
175 VA MAX .25x1.25in SB 5x25mm SB
SERIAL I/O
S H1 AH1 T5 L4 SR1 RL1 PP0 DC1 DT0 C0 E1
Table 10-1. Thermocouple Polarity
!
WARNING
FOR CONT5INUED PROTECTION AGAINST FIRE HAZARD,
REPLACE FUSE WITH SAME TYPE AND RATING.
DIGITAL I/O
Positive (+)
Chromel
Chromel
Chromel (PUR)
Chromel (YEL)
Copper (BLU)
Negative (–)
Gold
Gold
Constantan (RED)
Alumel (RED)
Constantan (RED)
Options and Accessories