Megohmmeter
Model 24508
Page 29
Technical data
General informa
-
tion
Pr
eparations for
use
Contr
ols and con
-
nections
Manual operation
of the unit
Contr
olling the
unit r
emotely
Maintenance and customer service
Contr
olling the
unit r
emotely
Example 1 :
Test voltage
=
100 V
Threshold
=
100 MOhm
Number of measurements
=
10
Measuring range
=
Automatic
Command: U2;S100,6;M10,0 CR
Example 2 :
Test voltage
=
500 V
Threshold
=
1 GOhm
Number of measurements
=
5
Measuring range
=
B5
Command: U4;S001,9;M05,5 CR
5.3.2 Response from type 24508
First transmission xx CR Response after receiving command
xx
Error flag (8-bit Hex code)
00
= Commands understood
40
Receive error (new instruction during the
measurement)
80
= Receive error or incorrect command code sent
CR
End-of-message symbol - Start measurement
- if the code contains
errors, wait for new
command string
Type 24508, transfer of measured value at end of measurement time:
Second transmission
xx,yyyyyEzzzCR
xx 8-bit flag (Hex code)
00 =
Measured value < Threshold
(insulation resistance error)
01 =
Measured value > Threshold
(insulation resistance ok)
10 =
Measured value < measuring range
20 =
Measured value > measuring range
21 =
Arithmetic combination (or logical
combination) of 20 and 01
30 =
Problem with Utest (test voltage
short-circuited)
40 =
Receive error
,
Data delimiter
yyyyy
16-bit measured value (0-65000)
E
Exponent
zzz
8-bit exponent (+ 127), if >128
exponent is negative*)
CR
End-of-message symbol (Carriage
Return)
* when current reading is negative
