Instruction Manual

Trident Model PD765 Universal Input Meter Instruction Manual
35
Recommended Calibration Points
To recalibrate the meter, it is recommended to use the Fahrenheit scale;
this will give a greater degree of accuracy to the calibration. The scale
can be changed to the Celsius scale after calibration is completed. The
meter will display temperature accurately in any scale. The following
table shows the recommended low and high calibration points for all
types.
Type of
input
Input 1
(Low)
Input 2
(High)
Check
(Middle)
Type J T/C
32°F 1182°F 600°F
Type K T/C
32°F 1893°F 960°F
Type T T/C
32°F 693°F 360°F
Type T T/C
32.0°F 693.0°F 360.0°F
Type E T/C
32°F 1652°F 840°F
100 Ω RTD
(0.00385)
32°F
100Ω
1148°F
320.12Ω
590°F
215.61Ω
100 Ω RTD
(0.00392)
32°F
100Ω
1127°F
320.89Ω
580°F
215.87Ω
Recalibration Procedure for Temperature Inputs
1. Connect signal to the meter using the appropriate wire (e.g. type J
thermocouple wire to recalibrate type J input), see page 17.
2. Set up the meter to accept the selected input (e.g. type J T/C), see
page 29.
3. Set up the meter to display temperature in degrees Fahrenheit, see
page 30.
4. Apply signal corresponding to input 1 (32°F) and program display 1 to
32, see page 34.
5. Apply signal corresponding to input 2 (1182°F for type J) and program
display 2 accordingly, see page 34.
6. After the meter accepts input 2, the display flashes the message
CJr
that indicates the meter is sensing the cold junction reference. This
completes the recalibration procedure for the selected input.
Recalibrating Process Inputs (
ICal)
The Internal Calibration (ICAL) menu, located in the Advanced features
menu, is used to recalibrate the current and voltage inputs. Recalibra-
tion is recommended at least every twelve months.
Refer to Internal Calibration (ICal), page 59 for instructions.