Chapter II
Benchtop multimeter
41
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Programming the range as a function of the measurement being made
Y
voltage
current
ohm
capacity
30H
500 mV
500 µA
500
Ω
50 nF
31H
5 V
5 mA
5 k
Ω
500 nF
32H
50 V
50 mA
50 k
Ω
5 µF
33H
500 V
500 mA
500 k
Ω
50 µF
34H
750V / 1000V
5 M
Ω
500 µF
35H
10 A
50 M
Ω
5 mF
36H
50 mF
3AH
auto range
auto range
auto range
auto range
5.4.2.2. Request instrument measurements or checks
Message: “3X” + CR (0DH)
5.4.2.2.1. Measurement request
The PC may ask the DMM for:
-
the last measurement made (“30”)
-
the next measurement (“31”)
-
repetitive measurements (“33”)
-
MIN, MAX, AVG recorded values (“380”, “381”, “382”)
The multimeter returns the result in the form of an ASCII message expressed in the
suitable unit (except for MIN, MAX, AVG).
Message received by the PC when requesting MIN, MAX or AVG :
The received message contains up to 11 characters : C1 to C10 + CR
C1 to C5 : indicates the value of the requested measurement in ASCII
(C1 : low significant bit ; C5 : most significant bit)
C6 :
indicates the number of the range in ASCII (refer to section
5.4.2.2.2., character 6). Furthermore, if the requested
measurement is negativ, 8 will be added in hexadecimal to the
range.
C7 :
if C7 is > 8 (in ASCII), the requested measurement is
overpassed.
C8 :
indicates the switch position during MIN, MAX, AVG mode
(refer to section 5.4.2.2.2, character 2).
C9 & C10 :
indicates the type of measured function (refer to section
5.4.2.2.2., character 3).
C11 :
CR
