Measurement and Control Module Operators Manual

9-1
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 112131 ±2.5
mV 0.33 µV
2 122232 ±7.5
mV 1. µV
3 132333±25
mV 3.33 µV
4 142434±250
mV 33.3 µV
5 152535±2500
mV 333. µV
*
Differential m
easurement; 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 ***
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
keep them in Common Mode Range. Output is
in millivolts.
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