Martel Electronics T120 - Manual (Page 2)

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GENERAL DESCRIPTION
The T120 is designed to be a simple to use,
high accuracy thermocouple calibrator capable
of either simulating or reading J, K, T, or E
thermocouple types. A standard thermocouple
mini-connector makes connections easy while
providing direct contact with the internal cold
junction compensation circuitry.
When used as a thermocouple simulator, the
T120 provides 2 sets of output control keys
which allow the user to either “step” in 100°
increments or scroll in smaller increments.
INSTALLATION
UNPACKING
Remove the Packing List and verify that all
equipment has been received. If there are any
questions about the shipment, please call
Martel at 1-800-821-0023.
When you receive the shipment, inspect the
container and equipment for any signs of
damage. Note any evidence of rough handling
in transit. Immediately report any damage to
the shipping agent.
NOTE
The carrier will not honor any claims unless
all shipping material is saved for their
examination. After examining and removing
contents, save packing material and carton in
the event reshipment is necessary.
SET-UP
Before beginning, become familiar with the
keypad layout and the configuration of the
input/output jacks. Remember, these jacks are
used in multiple configurations so pay careful
attention to how the test leads are connected
for the specific application.
OPERATING PROCEDURE
1. Turn on power and select the desired
thermocouple type by depressing the T/C
SELECT key. Once the desired T/C is
selected, it will remain in memory until a
new T/C type is selected.
2. Select either Input or Output mode
depending on whether you want to read a
thermocouple or simulate a thermocouple
signal.
3. Connect the appropriate thermocouple to
the mini-connector on the top of the T120.
4. If you are using the T120 in the output mode
use the STEP or SCROLL keys to set the
output. The STEP key will step in 100°
increments and the SCROLL key allows
single degree increments which will increase
in speed if the switch is depressed for
several seconds.
OPERATING MODES
1. When operating in the thermocouple output
mode, the T120 has the ability to simulate
up to 4 T/C types (J, K, T, E) into devices
which measure thermocouples:
Note: If the T120 is improperly connected to a
low impedance load (either a short or near
short) the display will flash “ERROR”.
FIGURE 1
SIMULATING A THERMOCOUPLE OUTPUT
2. When operating in the thermocouple Read
Mode the T120 can be used to read the
temperature of a thermocouple probe.
In this mode, the T120 will detect an open
circuit should the thermocouple junction
malfunction. In this case, the display will
flash “OPEN”. It will also flash “OPEN” if no
probe is connected in the Input Mode.
FIGURE 2
READING A THERMOCOUPLE PROBE
SPECIFICATIONS
Ranges J -100 to 1000°C
K -100 to 1200°C
T -100 to 400°C
E -100 to 950°C
Resolution 1°C or 1°F
Accuracy ±1°C above 0°C;
±1.5°C below 0°C
1
Operating Temp. 0 to 50°C
Storage Temp. -20 to 60°C
Temperature Coef. .01% F.S./°C
Power 2 9V alkaline battery (Yields
approx. 25 hrs. of operation)
Case Size 1.43” x 3.15” x 5.7”
Weight 12 oz.
Notes: 1 Accuracy is at 23°C ±2°C and includes
CJC error.
2 A low battery indication is given at 5.5 volts.
1Kohm or
greater input
impedance
Thermocouple
device under test
Use thermocouple wire for
the type selected (e.g. if a
"J" T/C is being simulated,
you must use "J" wire.)
Thermocouple
mini-connector
Thermocouple
Probe (J, K, T or E)
Thermocouple
mini-connector
} All ranges
can be read
in °C or °F