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5.2 MODULE 2 - S ECONDARY F UNCTION P ARAMETERS ( 2-SEC )
2-SEC
SEL
PARAMETER MENU
Pro
HI-En
Max Display
Enable
HI-t
Max Capture
Delay Time
LO-En
Min Display
Enable
LO-t
Min Capture
Delay TIme
FCS
Factory
Service
Operations
CodE
Access Code
For Service
Operations
HI-t ?
?
CodE
LO-En ?
LO-t ?
?
FCS ?
?
?
?
MAXDISPLAYENABLE
HI-En ? NO               YES
? NO
Enables the Maximum Display Capture capability.
MAX CAPTURE DELAY TIME
0.0 to 999.9 seconds
? 2.0
When the Input Display is above the present MAX value for the entered
delay time, the meter will capture that display value as the new MAX reading.
A delay time helps to avoid false captures of sudden short spikes.
MIN DISPLAY ENABLE
NO YES
? NO
Enables the Minimum Display Capture capability.
MIN CAPTURE DELAY TIME
0.0 to 999.9 seconds
2.0
When the Input Display is below the present MIN value for the entered delay
time, the meter will capture that display value as the new MIN reading. A delay
time helps to avoid false captures of sudden short spikes.
FACTORY SERVICE OPERATIONS
NO yES
NO
Select YES to perform either of the Factory Service Operations shown below.
RESTORE FACTORY DEFAULT SETTINGS
CodE Entering Code 66 will overwrite all user settings with
the factory settings. The meter will display rESEt and then
66 return to CodE 00 . Press SEL button to exit the module.
Pressing both the SEL and the RST button on power-up
will also load the factory settings and display rESEt . This allows operation in
the event of a memory failure or corruted data.
8
CALIBRATION
The CUB5TC uses stored voltage calibration and cold
junction temperature values to provide accurate temperature
? 48 and voltage measurements. Over time, the electrical
characteristics of the components inside the meter could
slowly change. The result is that the stored calibration values may no longer
accurately define the input circuit. For most applications, recalibration every 1
to 2 years should be sufficient.
Calibration of the CUB5TC involves a voltage calibration and a cold
junction calibration. It is recommended that both calibrations be performed.
The voltage calibration MUST precede the cold junction calibration. Allow 30
minute warm up before performing any calibration related procedure. The
following procedures should be performed at an ambient temperature of 15 to
35 °C (59 to 95 °F).
Calibration should only be performed by individuals experienced in
calibrating electronic equipment.
CAUTION : The accuracy of the calibration equipment will directly affect the
accuracy of the CUB5TC.
Input Voltage Calibration
1. Connect a precision DC voltage source with an accuracy of 0.01% or better
to the TC+ (positive) and the TC- (negative) terminals of the CUB5TC. Set
the output of the voltage source to zero.
2. With the display at CodE 48 , press and hold the SEL button for 2 seconds. Unit
will display CAL NO .
3. Press the RST button to select INP .
4. Press the SEL button. Display reads 0.0u .
5. With the voltage source set to zero, press SEL . Display reads CALC for about
eight seconds.
6. When display reads 60.0u , apply 60.000 mV input signal. Press SEL . Display
reads CALC for about eight seconds.
7. When display reads CAL NO , press SEL twice to exit Module 2 and return to
the normal display mode.
8. Proceed to Cold Junction Calibration.
Cold Junction Calibration
1. Install all option cards needed for your application and the rear cover,
or invalid results will occur.
2. The ambient temperature must be within 20°C to 30°C.
3. Connect a thermocouple (types T, E, J, K, or N only) with an accuracy of 1°C
or better to the meter.
4. Enter programming mode and verify the following settings in Module 1:
tYPE = thermocouple type connected to the unit
CJC = YES ; SCALE = °C ; dECPt = 0.0 ; OFSEt = 0
5. Place the thermocouple in close thermal contact to a reference thermometer
probe. (Use a reference thermometer with an accuracy of 0.25°C or better.)
The two probes should be shielded from air movement and allowed sufficient
time to equalize in temperature. (A calibration bath of known temperature
could be used in place of the thermometer.)
6. Compare the unit display with the reference temperature indicator (or
calibration bath). If a difference of more than ±1.0 °C exists, note the
difference (CJ error) and continue with cold junction calibration.
CJ Error = Reference Temperature - Unit Display.
7. Enter programming mode. Step through Module 2 to the Service Access
Code parameter and select CodE 48 . Press and hold the SEL button until the
unit displays CAL NO . Press the RST button to select CJC .
8. Press SEL . Display reads CJC followed by the current cold junction value.
Calculate a new cold junction value as follows:
New cold junction = Current cold junction + CJ Error (noted above)
9. Press RST and set the display to the new cold junction value. Press and hold
SEL . Display reads CALC for about four seconds and then returns to CAL NO .
10. Press SEL twice to exit calibration and return to the normal display mode.
Verify the input reading is correct. If not, repeat steps 6 through 10.
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