Measurement maximum frequencies – Rockwell Automation 441-PEN25 Enpac Ex Data Collector User Manual

Page 49

Publication GMSI00-UM001A-EN-E - February 2005

Setting Up Measurements 43

• Peak-Peak - Use for detection of displacement; sometimes used for

high frequency energy. This is the peak-to-peak (minimum to
maximum) amplitude of a sine wave at the frequency of interest and is
calculated from the RMS value.

• True Peak - Use to detect impacts and random transients. The dynamic

time signal contains the absolute value of the largest peak (positive or
negative) within a specified time window. Returns a magnitude value
only. If used with a spectrum measurement, Emonitor uses a Peak signal
detection type instead. This value is not calculated but is measured
directly.

• True Peak-Peak - Use to detect impacts and random transients. The

dynamic time signal contains the absolute value of the largest peak to
peak distance within a specified time window. Returns a magnitude value
only. If used with a spectrum measurement, Emonitor uses a Peak-Peak
signal detection type instead. This value is not calculated but is measured
directly.

Measurement Maximum Frequencies

The measurement maximum frequency is part of the collection specification
(Setup > Collection). See Figure 3.4 on page 40. You select the collection
specification when you set up the measurement definition. Emonitor and the
Enpac Ex support the following maximum frequencies in Hz (CPM).

These values are available in the Enpac Ex only in Off Route data collection

Table 3.3 Maximum frequencies

CPM

(600)

200

(12,000)

1100

(66,000)

3000

(180,000)

12,800*

(768,000)*

(1200)

250

(15,000)

1200

(72,000)

3125*

(187,500)*

13,000

(780,000)

(1500)

256*

(15,360)*

1250

(75,000)

3200

(192,000)

15,000

(900,000)

32*

(1920)*

300

(18,000)

1280*

(76,800)*

4000

(240,000)

16,000

(960,000)

(2400)

320

(19,200)

1300

(78,000)

5000

(300,000)

18,000

(1,080,000

(3000)

400

(24,000)

1400

(84,000)

6000

(360,000)

20,000

(1,200,000)

64*

(3840)*

500

(30,000)

1500

(90,000)

6250*

(375,000)*

25,000

(1,500,000)

(4800)

600

(36,000)

1600

(96,000)

6400

(384,000)

30,000

(1,800,000)

100

(6000)

625

(37,500)

1700

(102,000)

7000

(420,000)

32,000*

(1,920,000)*

120

(7200)

640*

(38,400)*

1800

(108,000)

8000

(480,000)

40,000

(2,400,000)

125

(7500)

700

(42,000)

1900

(114,000)

9000

(540,000)

128*

(7680)*

800

(48,000)

2000

(120,000)

10,000

(600,000)

150

(9000)

900

(54,000)

2500

(150,000)

12,000

(720,000)

160

(9600)

1000

(60,000)

2560*

(153,600)*

12,500*

(750,000)*