Meggitt VM600 Hardware Manual

VM600 MPS hardware manual (standard version) MAMPS-HW/E 7 - 29
Edition 17 - February 2018
Dual mathematical function
PROCESSING MODES AND APPLICATIONS
7.17Dual mathematical function
(1) Description
Dual mathematical function (DMF) processing provides a range of dual-channel
mathematical functions that operate on the single-channel processed outputs of the
measurement channel inputs on an MPC4 card (see Figure 7-28).
The mathematical functions provided include basic mathematical operations (addition and
subtraction) and discriminator operations that select the minimum value or the maximum
value from the two input channels.
NOTE: DMF processing only operates on the first processed outputs from the
single-channel processings (shown as Out 1 in Figure 7-28).
The mathematical functions are:
• RMS Sum which performs the RMS addition of two single-processing input channels:
( (Channel 1)
2
+ (Channel 2)
2
)
0.5
or ( (Channel 3)
2
+ (Channel 4)
2
)
0.5
The RMS Sum function requires that both input channels are configured with an RMS
rectifier.
• RMS Subtraction which performs the RMS subtraction of two single-processing input
channels: ( (Channel 1)
2
− (Channel 2)
2
)
0.5
or ( (Channel 3)
2
− (Channel 4)
2
)
0.5
The RMS Subtraction function requires that both input channels are configured with an
RMS rectifier.
NOTE: For RMS Subtraction, if (Channel 2)
2
> (Channel 1)
2
or
(Channel 4)
2
> (Channel 3)
2
then zero (0.0) is returned.
• SUM which performs the addition of two single-processing input channels:
(Channel 1 + Channel 2) or (Channel 3 + Channel 4)
The SUM function requires that both input channels are configured with the same
rectifier.
• SUBTRACTION which performs the subtraction of two single-processing input channels:
(Channel 1 − Channel 2) or (Channel 3 − Channel 4)
The SUBTRACTION function requires that both input channels are configured with the
same rectifier.
• X & Y MIN which selects the smaller value from two single-processing input channels:
Minimum { (Channel 1 , Channel 2) } or Minimum { (Channel 3 , Channel 4) }
The X & Y MIN function requires that both input channels are configured with the same
rectifier.
• X & Y MAX which selects the larger value from two single-processing input channels:
Maximum { (Channel 1 , Channel 2) } or Maximum { (Channel 3 , Channel 4) }
The X & Y MAX function requires that both input channels are configured with the same
rectifier.
NOTE: In order to use dual mathematical function (DMF) processing with two
single-processing input channels, both single-processing input channels
(channel 1 and channel 2, or channel 3 and channel 4) must be configured with the
same single-channel processing function (for example, broad-band absolute
bearing vibration (BBAB)) and with rectifiers from the same rectifier group (for
example, AVG, RMS or True).

Meggitt VM600 Specifications

General

Brand	Meggitt
Model	VM600
Category	Measuring Instruments
Language	English