Lake Shore Model 340 Temperature Controller User’s Manual
Options and Accessories
10-7
DIGITAL I/O
ANALOG
OUT 1
ANALOG
OUT 2
SERIAL I/O
120
IEEE-488 INTERFACE
S
H1 AH1 T5 L4 SR1 RL1 PP0 DC1 DT0 C0 E1
RELAYS
NC C NO NC C NO
LO
HI
HEATER FUSE
2.5 A
HEATER OUTPUT
LO
HI
DATA CARD
FUSE
DATA
-10% +5%
50-60 Hz
175 VA MAX
LINE
100 / 120
2.0 A
.25x1.25in SB
220 / 240
1.0 A
5x25mm SB
OFF
ON
INPUT A
l+
V+
l-
V-
INPUT B
l+
V+
l-
V-
60V MAX
WARNING
NO USER SERVICEABLE PARTS INSIDE. REFER
SERVICING TO TRAINED SERVICE PERSONNEL.
!
WARNING
FOR CONT5INUED PROTECTION AGAINST FIRE HAZARD,
REPLACE FUSE WITH SAME TYPE AND RATING.
!
EXT
l+
V+
l-
V-
l+
V+
l-
V-
INPUT C
INPUT D
MODEL 3462
Figure 10-8. Model 340 Rear Panel with Model 3462 Option Card Installed
10. Retrieve option plate screws from Step 5 and use to secure 3462 Option Card to the rear panel.
11. Stand instrument on face. Slide top and bottom covers on. Reposition rear plastic bezel, then rethread all
cover screws. The completed installation should look like Figure 10-8.
12. Replace power cord. Turn on power switch. To verify 3462 Option Card installation, press
Options
, then
press
More
three times. The Model 340 displays the 3462 option in the REVISION INFORMATION.
10.3.2 Operation
This Model 340 unit now functions with two additional inputs called “C” and “D”. All menus that allow input
channel selection scroll from “A” to “D” and back again. Example: Press
Display Format
to show the Reading
Display Format screen. Press
Enter
to highlight the “Disp:” field. Use the
s
or
t
key to scroll through the
inputs.
10.3.3 Specifications
The 3462 Option Card input specifications are the same as for standard inputs on the Model 340 main board
listed in Table 1-2.
10.4 MODEL 3464 DUAL THERMOCOUPLE INPUT OPTION CARD
10.4.1 General
The Model 3464 Option Card adds two thermocouple inputs to the Model 340 Temperature Controller. They
appear on the Model 340 display as
C
and
D
. Use them for temperature measurement and control with a wide
variety of thermocouple sensors. The standard instrument inputs remain fully functional.
The 3464 option using the Input Setup menu can select 2 distinct input ranges to accommodate both cryogenic
and high temperature operation. Turn the built-in room temperature compensation on or off through the keypad
or remote interfaces.
A thermocouple is a common sensor to measure temperature. Two dissimilar metals joined at one end
produce a small unique voltage at a given temperature. The 3464 thermocouple hardware and software
measures and interprets this voltage.
Thermocouples are available in different combinations of metals or calibrations. The four most common
thermocouples for cryogenic applications are Chromel-AuFe, K, T and E. The Model 340 with a 3464 option
provides 5 standard curves. Users may enter custom curves.
Each thermocouple has a different temperature range and environment, although the maximum temperature
varies with the diameter of the wire used in the thermocouple. Special techniques are required to approach
accuracy of 1% of temperature, even without consideration for the effects of high magnetic fields or high
radiation fluxes.