SECTION 9. INPUT/OUTPUT INSTRUCTIONS

 

 

TABLE 9-1. Input Voltage Ranges and Codes

 

 

 

Range Code

 

Full Scale Range

Resolution*

Slow

Fast

60 Hz

50 Hz

 

 

 

 

2.72ms

250µs

Reject

Reject

 

 

 

 

Integ.

Integ.

 

 

 

 

 

 

1

11

21

31

±2.5 mV

0.33 µV

2

12

22

32

±7.5 mV

1.

µV

3

13

23

33

±25

mV

3.33 µV

4

14

24

34

±250

mV

33.3

µV

5

15

25

35

±2500

mV

333.

µV

* Differential measurement; resolution for single-ended measurement is twice value shown.

NOTE: When a voltage input exceeds the range programmed, the value which is stored is set to the maximum negative number and displayed as -99999 in high resolution or -6999 in low resolution.

*** 1 SINGLE-ENDED VOLTS ***

keep them in Common Mode Range. Output is

 

in millivolts.

FUNCTION

This Instruction is used to measure voltage at a single-ended input with respect to ground. Output is in millivolts.

PARAM.

DATA

 

NUMBER

TYPE

DESCRIPTION

01:

2

Repetitions

02:

2

Range code (Table 9-1)

03:

2

Single-ended channel

 

 

number for first

 

 

measurement

04:

4

input location for first

 

 

measurement

05:

FP

Multiplier

06:

FP

Offset

Input locations altered: 1 per measurement

*** 2 DIFFERENTIAL VOLTS ***

FUNCTION

This Instruction reads the voltage difference between the high and low inputs of a differential channel. Table 9-1 contains all valid voltage ranges and their codes. Both the high and low inputs must be within ±2.5 V of the CR10's ground (see Common Mode Range in Section 14.3.2). Pyranometer and thermopile sensors require a jumper between LO and GROUND to

PARAM.

DATA

 

NUMBER

TYPE

DESCRIPTION

01:

2

Repetitions

02:

2

Range code (Table 9-1)

03:

2

Differential channel

 

 

number for first

 

 

measurement

04:

4

Input location for first

 

 

measurement

05:

FP

Multiplier

06:

FP

Offset

Input locations altered: 1 per measurement

*** 3 PULSE COUNT ***

There are three pulse input types which may be measured with the Pulse Count Instruction.

HIGH FREQUENCY PULSE

In this configuration, the minimum detectable pulse width is 2 microseconds, i.e. the maximum frequency is 250 kHz with a 50% duty cycle. The 8 bit counter has a maximum input frequency of 2000 Hz and the 16 bit option a maximum of 250 kHz. The count is incremented when input voltage changes from below 1.5 volts to above 3.5 volts. The

9-1