VTI Instruments EX1200 Series - Jumper Configuration for Measurements

VTI Instruments Corp.
16 EX1200 Series Terminal Blocks
J
UMPER
C
ONFIGURATION
Differential TBs have the ability to use an on-board 10 kΩ thermistor (RT1) to connect to an
instrument when temperature measurements are being made. Before doing so, the P2 header must
be configured correctly. The function of this header is to make a connection between the T1 and
T2 terminals on the terminal block, the CJC (RT1) sensor, and two other TB terminals.
In the default position, pin 1 is shorted to pin 6 and pins 3 and 4 are shorted (see
326H
Figure 3-2) on
P2. This configuration allows T1 and T2 to be used in any type of measurement. When configured
to one of the other two configurations, the channels associated with these terminals are dedicated
to making temperature measurements and cannot be used in any other manner.
To use RT1 for CJC measurements, short pin 2 to pin 3 and pin 4 to pin 5. This will join T1 and
T2 to L_VS and H_VS. The terminal numbers for L_VS and H_VS differ between TB modules
and are documented with the terminal block pin mapping information for each switch card.
To use an external sensor for temperature measurements, short pin 1 to pin 2 and pins 5 and 6 on
P2. This joins T1 and T2 to RL_I and RH_I. For the TB104 and TB160, the external sensor should
be connected to T1 and T2 or T161 and T162 when in this configuration. For the TB200, the
external sensor can be connected T1 and T2 or T181 and T182 when in this configuration.
F
IGURE
3-2: P2 J
UMPER
C
ONFIGURATION
D
IAGRAM
NOTE The actual switch card channel that is dedicated to temperature measurement through the P2
header is dependent on the channel to which T1 and T2 of the terminal block are connected.
327H
Figure 3-2, an EX1200-TB160-1 is shown where T1 and T2 are connected to CH1_1L and
CH1_1H, respectively. The channels are indicated in the Terminal Block Pin Mapping discussion
for each switch card.