A02:0000 Enter 1 and advance to second parameter (Input Storage location to sample).

1

02:1

Input Storage Location 1,

 

 

where the temperature is

 

 

stored.

A

04:P00

Enter 1 and advance to

 

 

fourth program

 

 

instruction.

*

00:00

Exit Table 1.

0

LOG 1

Enter *0 Mode, compile

 

 

program, log data.

The CR10 is now programmed to measure the internal temperature every 5 seconds and send each reading to Final Storage. Values in Final Storage can be viewed using the *7 Mode.

Display Will Show:

 

Key

(ID:Data)

Explanation

*7

07: 13.000

Enter *7 Mode. The

 

 

Data Storage Pointer

 

 

(DSP) is at Location 13

 

 

(in this example).

A01: 0102 Advance to the first value, the Output Array ID. 102 indicates the Output Flag was set by the second instruction in Program Table 1.

A02: 21.23 Advance to the first stored temperature.

A01: 0102 Advance to the next output array. Same Output Array ID.

A02: 21.42 Advance to 2nd stored temp, 21.42 deg. C.

There are no date and time tags on the data. They must be put there with Output Instruction 77. Instruction 77 is used in the next example.

If a terminal is used to communicate with the CR10, Telecommunications Commands (Section 5) can be used to view entire Output Arrays (in this case the ID and temperature) at the same time.

CR10 OVERVIEW

OV5.2 SAMPLE PROGRAM 2

This second example is more representative of a real-life data collection situation. Once again the internal temperature is measured, but it is used as a reference temperature for the differential voltage measurement of a type T (copper-constantan) thermocouple; the CR10 should have arrived with a short type T thermocouple connected to differential channel 5.

When using a type T thermocouple, the copper lead (blue) is connected to the high input of the differential channel, and the constantan lead (red) is connected to the low input.

A thermocouple produces a voltage that is proportional to the difference in temperature between the measurement and the reference junctions.

To make a thermocouple (TC) temperature measurement, the temperature of the reference junction (in this example, the approximate panel temperature) must be measured. The CR10 takes the reference temperature, converts it to the equivalent TC voltage relative to 0oC, adds the measured TC voltage, and converts the sum to temperature through a polynomial fit to the TC output curve (Section 13.4).

The internal temperature of the CR10 is not a suitable reference temperature for precision thermocouple measurements. It is used here for the purpose of training only. To make thermocouple measurements with the CR10, purchase the Campbell Scientific Thermocouple Reference, Model CR10TCR (Section 13.4) and make the reference temperature measurement with Instruction 11.

Instruction 14 directs the CR10 to make a differential TC temperature measurement. The first parameter in Instruction 14 is the number of times to repeat the measurement. Enter 1, because in this example there is only one thermocouple. If there were more than 1 TC, they could be wired to sequential channels, and the number of thermocouples entered for repetitions. The CR10 would automatically advance through the channels sequentially and measure all of the thermocouples.

OV-17