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Revision 4.6 3/2004
Probe: 12345678
P&a385 RO = 100
Step 13
With the desired probe type selected and fl ash-
ing press the enter key.
ENT
The calibrator will respond by displaying the following:
Resolution:
1 .1 .01 0.001
The maximum resolution that the combination of the
Calibrator base unit, RTD interface module and probe
can support can be determined as follows:
The resolution of the RTD module is 0.001% of the
full scale resistance of the reference resistor used in the
module. The GQS-RT1 incorporates a 400 ohm refer-
ence resistor and the GQS-RT2 incorporates a 4000 ohm
reference resistor.
Using the GQS-RT1 as the example the maximum reso-
lution is:
0.001% of 400 ohms
= 0.00001 x 400 = 0.004 ohms
For a PT 100 the temperature resolution can be deter-
mined as follows:
0.004 ohms/(100 ohms x 0.00385 ohms/degree C) =
0.008 degrees C (approx 0.005 degrees F)
Therefore, rounding to the next highest digit results in a
resolution of 0.01 degrees C.
The resolution supported for the factory programmed
RTDs can be found below:
Using the RT-1
Probe Type Resolution
Pt 100
0.01 degrees C or F
(385 & 392)
Ni 120
0.1 degrees C or F
Cu 10
0.1 degrees C or F
Using the RT-2
Probe Type
Resolution
Pt 1000
1.0 degrees C or F
Resolution must be selected in conjunction with the full
scale ohms output for the RTD probe to be used.
Step 14
Select the desired resolution using the left/right
arrow keys. In this case, since we are using the Pt100
RTD with a maximum resolution of 0.01 degrees C the
0.01 option has been selected
Resolution:
1 .1 01 0.001
Step 15
With the desired resolution selected and fl ash-
ing press the enter key.
ENT
The calibrator will briefl y show internal limit settings
and will then commence temperature measurement.
The measurement parameters can be changed at any
time through the activation of the RTmodule set up menu.
Section 16.2
Calibrating/Programming the
GQS-RT RTD Interface Module
The GQS-RT can be programmed in the fi eld. Program-
ming, calibration adjustment or recertifi cation can be
accomplished with the Calibration Programming Utility
disk. Please note, in order to improve the accuracy of
the measurement system it will be necessary to gener-
ate a signifi cant number of very accurate temperature
calibration points using precision temperature baths. In
general, the simplest way to enhance the accuracy of the
temperature measurement is to simply re-zero the probe
while immersed in an ice bath.
Section 17.0 Thermocouple Interface Module
The Thermocouple Interface Module allows the hand-
held calibrator base unit (equipped with fi rmware version
3.01 or later) to read the input from a thermocouple
temperature measuring device. The calibrator offers the
following features for thermocouple measurement:
• Selectable units of measure
• Direct millivolt readout for any type of thermocouple
• Choice of internal or external refernce junction
• Selectable resolution, or “auto” mode
• Programming to allow readout in temperature units for
the following 8 thermocouple types:
Type Materials
J
Iron & Copper-Nickel (Constantan)
K
Nickel-Chromium & Nickel-Aluminum
T
Copper & Copper-Nickel (Constantan)
E
Nickel-Chromium & Copper-Nickel
(Constantan)
R
Platinum-13% Rhodium & Platinum
S
Platinum-10% Rhodium & Platinum
B
Platinum-30% Rhodium & Platinum
– 6% Rhodium
N
Nickel-Chromium-Silicon & Nickel-Silicon-
Magnesium
Summary of Contents for PTE-1
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